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Nanofluids

Nanofluids
Synthesis, Properties and Applications

by S. M. Sohel Murshed,C. A. Nieto de Castro

  • Publisher : Nova Science Pub Incorporated
  • Release : 2014-01-01
  • Pages : 282
  • ISBN : 9781633216778
  • Language : En, Es, Fr & De
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As an emerging research field, nanofluids have sparked immense interest from researchers around the world and have been a subject of intensive research in recent years. Because of their fascinating thermophysical properties and heat transfer performances, as well as enormous potential applications, nanofluids are considered the next generation heat transfer fluids. This book covers a wide range of topics from preparation methodology, properties, and theories to applications of nanofluids. In addition to the state-of-the-art reviews and analysis on the key areas of nanofluids including thermophysical and heat transfer properties of carbon nanotube and magnetic nanofluids, viscosity of metal oxide nanofluids and pool boiling of nanofluids, this book presents extensive experimental and theoretical research efforts on thermal conductivity, viscosity, convective heat transfer, capillary wetting, and transport properties of nanofluids. Studies on the application of nanofluids in droplet-based microfluidic technology are presented. Another new area of nanofluid-based optical engineering is explored in this book. It also introduces a new class of nanofluids named-ionanofluids. Featuring contributions from some of the leading researchers in the field, this book is a unique reference source and an invaluable guide to scientists, researchers, engineers, industrial people, graduate and postgraduate students, as well as academicians across the science and engineering disciplines.

Nanofluids

Nanofluids
Science and Technology

by Sarit K. Das,Stephen U. Choi,Wenhua Yu,T. Pradeep

  • Publisher : John Wiley & Sons
  • Release : 2007-12-04
  • Pages : 485
  • ISBN : 0470180684
  • Language : En, Es, Fr & De
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Introduction to nanofluids--their properties, synthesis, characterization, and applications Nanofluids are attracting a great deal of interest with their enormous potential to provide enhanced performance properties, particularly with respect to heat transfer. In response, this text takes you on a complete journey into the science and technology of nanofluids. The authors cover both the chemical and physical methods for synthesizing nanofluids, explaining the techniques for creating a stable suspension of nanoparticles. You get an overview of the existing models and experimental techniques used in studying nanofluids, alongside discussions of the challenges and problems associated with some of these models. Next, the authors set forth and explain the heat transfer applications of nanofluids, including microelectronics, fuel cells, and hybrid-powered engines. You also get an introduction to possible future applications in large-scale cooling and biomedicine. This book is the work of leading pioneers in the field, one of whom holds the first U.S. patent for nanofluids. They have combined their own first-hand knowledge with a thorough review of theliterature. Among the key topics are: * Synthesis of nanofluids, including dispersion techniques and characterization methods * Thermal conductivity and thermo-physical properties * Theoretical models and experimental techniques * Heat transfer applications in microelectronics, fuel cells, and vehicle engines This text is written for researchers in any branch of science and technology, without any prerequisite.It therefore includes some basic information describing conduction, convection, and boiling of nanofluids for those readers who may not have adequate background in these areas. Regardless of your background, you'll learn to develop nanofluids not only as coolants, but also for a host ofnew applications on the horizon.

Nanofluids

Nanofluids
Research, Development and Applications

by Yuwen Zhang

  • Publisher : Nova Science Pub Incorporated
  • Release : 2013-01-01
  • Pages : 377
  • ISBN : 9781626181656
  • Language : En, Es, Fr & De
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This book presents current research related to the synthesis, characterisation, and heat transfer of nanofluids. Nanofluids are stable colloidal suspensions of solid nanomaterials in base fluids. While nanoparticles were first added to base fluids to obtain nanofluids; other nanomaterials, like nanorods, nanotubes, nanowires, nanofibers, nanosheets, or other nanocomposites, are used to synthesise the nanofluids. The types of base fluids cover a wide range of liquids that include water, oil, ethylene-glycol (automotive antifreeze), refrigerants, polymer solutions, or even bio-fluids. The special properties of nanomaterials and their interactions with base fluids lead to substantially different properties of nanofluids compared with that of base fluids. Significant physical insights into complex physical phenomena in nanofluids are gained via the utilisation of advanced theoretical tools and state-of-the-art experimental measurement techniques.

Nanofluids and Their Engineering Applications

Nanofluids and Their Engineering Applications
A Book

by K.R.V. Subramanian,Tubati Nageswara Rao,Avinash Balakrishnan

  • Publisher : CRC Press
  • Release : 2019-06-18
  • Pages : 498
  • ISBN : 0429886993
  • Language : En, Es, Fr & De
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Nanofluids are solid-liquid composite material consisting of solid nanoparticles suspended in liquid with enhanced thermal properties. This book introduces basic fluid mechanics, conduction and convection in fluids, along with nanomaterials for nanofluids, property characterization, and outline applications of nanofluids in solar technology, machining and other special applications. Recent experiments on nanofluids have indicated significant increase in thermal conductivity compared with liquids without nanoparticles or larger particles, strong temperature dependence of thermal conductivity, and significant increase in critical heat flux in boiling heat transfer, all of which are covered in the book. Key Features Exclusive title focusing on niche engineering applications of nanofluids Contains high technical content especially in the areas of magnetic nanofluids and dilute oxide based nanofluids Feature examples from research applications such as solar technology and heat pipes Addresses heat transfer and thermodynamic features such as efficiency and work with mathematical rigor Focused in content with precise technical definitions and treatment

Recent Developments of Nanofluids

Recent Developments of Nanofluids
A Book

by Rahmat Ellahi

  • Publisher : MDPI
  • Release : 2018-06
  • Pages : 158
  • ISBN : 3038428337
  • Language : En, Es, Fr & De
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Over the past two decades, there has been increased attention in the research of nanofluid due to its widely expanded domain in many industrial and technological applications. Major advances in the modeling of key topics such as nanofluid, MHD, heat transfer, convection, porous media, Newtonian/non-Newtonian fluids have been made and finally published in the special issue on recent developments in nanofluids for Applied Sciences. The present attempt is to edit the special issue in a book form. Although, this book is not a formal textbook even than it will definitely be useful for research students and university teachers in overcoming the difficulties occurring in the said topic while dealing with the nonlinear governing equations. On one side the real world problems in mathematics, physics, biomechanics, engineering and other disciplines of sciences are mostly described by the set of nonlinear equations whereas on the other hand, it is often more difficult to get an analytic solution or even a numerical one. This book has successfully handled this challenging job with latest techniques. In addition the findings of the simulation are logically realistic and meet the standard of sufficient scientific value.

Hybrid Nanofluids for Convection Heat Transfer

Hybrid Nanofluids for Convection Heat Transfer
A Book

by Hafiz Muhammad Ali

  • Publisher : Academic Press
  • Release : 2020-05-15
  • Pages : 300
  • ISBN : 012819281X
  • Language : En, Es, Fr & De
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Hybrid Nanofluids for Convection Heat Transfer discusses how to maximize heat transfer rates with the addition of nanoparticles into conventional heat transfer fluids. The book addresses definitions, preparation techniques, thermophysical properties and heat transfer characteristics with mathematical models, performance-affecting factors, and core applications with implementation challenges of hybrid nanofluids. The work adopts mathematical models and schematic diagrams in review of available experimental methods. It enables readers to create new techniques, resolve existing research problems, and ultimately to implement hybrid nanofluids in convection heat transfer applications. Provides key heat transfer performance and thermophysical characteristics of hybrid nanofluids Reviews parameter selection and property measurement techniques for thermal performance calibration Explores the use of predictive mathematical techniques for experimental properties

Nanofluids

Nanofluids
Mathematical, Numerical, and Experimental Analysis

by Mohammad Hatami,Dengwei Jing

  • Publisher : Academic Press
  • Release : 2020-01-15
  • Pages : 368
  • ISBN : 0081029349
  • Language : En, Es, Fr & De
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Nanofluids: Mathematical, Numerical and Experimental Analysis provides a combined treatment of the numerical and experimental aspects of this crucial topic. Mathematical methods such as the weighted residual method and perturbation techniques, as well as numerical methods such as Finite Element and Lattice-Boltzmann are addressed, along with experimental methods in nanofluid analysis. The effects of magnetic field, electric field and solar radiation on the optical properties and synthesis of nanofluid flow are examined and discussed as well. This book also functions as a comprehensive review of recent progress in nanofluids analysis and its application in different engineering sciences. This book is ideal for all readers in industry or academia, along with anyone interested in nanofluids for theoretical or experimental design reasons. Explains the governing equations in which magnetic or electric fields are applied Gives instructions on how to confirm numerical modeling results by comparing with experimental outcomes Provides detailed information on the governing equations where nanofluids are used as a working fluid

Heat Transfer Enhancement with Nanofluids

Heat Transfer Enhancement with Nanofluids
A Book

by Vincenzo Bianco,Oronzio Manca,Sergio Nardini,Kambiz Vafai

  • Publisher : CRC Press
  • Release : 2015-04-01
  • Pages : 481
  • ISBN : 1482254026
  • Language : En, Es, Fr & De
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Nanofluids are gaining the attention of scientists and researchers around the world. This new category of heat transfer medium improves the thermal conductivity of fluid by suspending small solid particles within it and offers the possibility of increased heat transfer in a variety of applications. Bringing together expert contributions from across the globe, Heat Transfer Enhancement with Nanofluids presents a complete understanding of the application of nanofluids in a range of fields and explains the main techniques used in the analysis of nanofuids flow and heat transfer. Providing a rigorous framework to help readers develop devices employing nanofluids, the book addresses basic topics that include the analysis and measurements of thermophysical properties, convection, and heat exchanger performance. It explores the issues of convective instabilities, nanofluids in porous media, and entropy generation in nanofluids. The book also contains the latest advancements, innovations, methodologies, and research on the subject. Presented in 16 chapters, the text: Discusses the possible mechanisms of thermal conduction enhancement Reviews the results of a theoretical analysis determining the anomalous enhancement of heat transfer in nanofluid flow Assesses different approaches modeling the thermal conductivity enhancement of nanofluids Focuses on experimental methodologies used to determine the thermophysical properties of nanofluids Analyzes forced convection heat transfer in nanofluids in both laminar and turbulent convection Highlights the application of nanofluids in heat exchangers and microchannels Discusses the utilization of nanofluids in porous media Introduces the boiling of nanofluids Treats pool and flow boiling by analyzing the effect of nanoparticles on these complex phenomena Indicates future research directions to further develop this area of knowledge, and more Intended as a reference for researchers and engineers working in the field, Heat Transfer Enhancement with Nanofluids presents advanced topics that detail the strengths, weaknesses, and potential future developments in nanofluids heat transfer.

Heat Transfer Due to Laminar Natural Convection of Nanofluids

Heat Transfer Due to Laminar Natural Convection of Nanofluids
Theory and Calculation

by De-Yi Shang,Liang-Cai Zhong

  • Publisher : Springer
  • Release : 2018-07-30
  • Pages : 202
  • ISBN : 3319944037
  • Language : En, Es, Fr & De
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This book presents a theoretical study of heat transfer due to laminar natural convection of nanofluids, using Al2O3-water nanofluid as an example. An innovative method of similarity transformation of velocity fields on laminar boundary layers is applied for the development of a mathematical governing model of natural convection with actual nanofluids, and a novel model of the nanofluid's variable thermophysical properties is derived by a mathematical analysis based on the developed model of variable physical properties of fluids combined with the model of the nanofluid's thermal conductivity and viscosity. Based on these, the physical property factors of nanofluids are produced, which leads to a simultaneous solution for deep investigations of hydrodynamics and heat transfer of nanofluid's natural convection. The book also proposes novel predictive formulae for the evaluation of heat transfer of Al2O3-water nanofluid’s natural convection. The formulae have reliable theoretical and practical value because they are developed by rigorous theoretical analysis of heat transfer combined with full consideration of the effects of the temperature-dependent physical properties of nanofluids and the nanoparticle shape factor and concentration, as well as variations of fluid boundary temperatures. The conversion factors proposed help to turn the heat transfer coefficient and rate of fluid natural convection into those of nanofluid natural convection. Furthermore, several calculation examples are provided to demonstrate the heat transfer application of the proposed predictive formulae.

Nanofluid Heat and Mass Transfer in Engineering Problems

Nanofluid Heat and Mass Transfer in Engineering Problems
A Book

by Mohsen Sheikholeslami Kandelousi

  • Publisher : BoD – Books on Demand
  • Release : 2017-03-15
  • Pages : 284
  • ISBN : 9535130072
  • Language : En, Es, Fr & De
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In the present book, nanofluid heat and mass transfer in engineering problems are investigated. The use of additives in the base fluid like water or ethylene glycol is one of the techniques applied to augment heat transfer. Newly, innovative nanometer-sized particles have been dispersed in the base fluid in heat transfer fluids. The fluids containing the solid nanometer-sized particle dispersion are called "nanofluids." At first, nanofluid heat and mass transfer over a stretching sheet are provided with various boundary conditions. Problems faced for simulating nanofluids are reported. Also, thermophysical properties of various nanofluids are presented. Nanofluid flow and heat transfer in the presence of magnetic field are investigated. Furthermore, applications for electrical and biomedical engineering are provided. Besides, applications of nanofluid in internal combustion engine are provided.

Application of Nanofluids in Plate Heat Exchanger: A Review

Application of Nanofluids in Plate Heat Exchanger: A Review
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2015
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Highlights: Use of nanofluid improves the heat transfer performance of plate heat exchanger. Thermo-physical properties of the nanofluid have been discussed. Optimum particle concentrations for maximum heat transfer is found to exist. Abstract: Writing, or even making an attempt to write anything on or about Plate Heat Exchangers (Henceforth, PHE) would be no more than a futile effort to reassert and glorify an already stronghold state of PHEs, as is evident with the kind of multilayered and multi-tasked functions it performs, obviously in different forms, in various domains of work & walks of life, since a good long time. Nonetheless, in a bid to bring about a certain makeshift in the way the PHE has been functioning and sustaining, there was a need to revisit the structural pattern and the fluids that contribute to the performance of PHE. Summarily, this brings the researcher and designers to shift the focus not only from the conventional design but also to introduce a new substance which could further contribute to enhance the performance of the PHE. That is why, in recent times, the miniaturization of PHE and energy efficiency have become focal point of attention, discourse and research. While exploring for better alternates, the nanofluids have surfaced as probable (replaceable) substitutes. The Nanofluid is a relatively recent (in contrast with the PHEs) finding that promises, pronouncedly, greater heat absorbing and heat transport ability. The review article attempts to take a sneak peak into some of the important published articles that deal with the function and performance of PHEs using nanofluids. The first section of the paper presents observations by several authors on experimental and numerical results regarding thermal conductivity, viscosity, specific heat and heat transfer coefficients. The second section talks of application of nanofluids in plate heat exchangers. It has also examined the utility of nanofluids, particularly in PHEs, based on experiments and numerical studies. A review of previous works featuring experimental and numerical investigations seems to be suggesting, to the level of establishing, that nanofluids have great potential in increasing the overall performance of the plate heat exchangers. There is a further vital scope to work on the performance and utility of nanofluids and work on the equative proportions of its application, in the direction, the paper has made an attempt of.

Thermal Characteristics and Convection in Nanofluids

Thermal Characteristics and Convection in Nanofluids
A Book

by Aditya Kumar

  • Publisher : Springer Nature
  • Release : 2021
  • Pages : 329
  • ISBN : 981334248X
  • Language : En, Es, Fr & De
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2D-Based Nanofluids: Materials Evaluation and Performance

2D-Based Nanofluids: Materials Evaluation and Performance
A Book

by Jaime Taha-Tijerina

  • Publisher : Unknown Publisher
  • Release : 2016
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Advancement in technology demands the successful utilization of energy and its management in a greater extent. Thermal energy management plays a crucial role from high-payload electrical instruments to ultra-small electronic circuitries. The advent of nanofluids that happened in the 1990s successfully addressed the low thermal efficiency of conventional fluids in a significant manner. The ground-breaking report on the concept of "nanofluids for thermal management" led to the development of numerous thermal fluids using nanofillers of ceramics, metals, semiconductors, various carbon nanostructures, and composite materials. Later, demonstration of two-dimensional (2D) nanomaterials and their successful bulk synthesis led to the development of highly efficient fluids with even very low filler fractions. Introduction of 2D materials into fluids also brought out the multifunctional aspects of fluids by using them in tribology. In this chapter, we narrate the advances in thermal nanofluids and the development of novel fluids with the discovery graphene. Multifunctional aspects of these fluids are discussed here. To support the experimental observation, a theoretical platform is discussed and its predictions are correlated on the basis of existing data. The chapter has been concluded with a brief discussion on futuristic aspects of nanofluids in real-life applications. This chapter aims to focus on the description of the thermal transport, tribological behavior, and aspects that involve the use of 2D-based nanofluids, from various 2D nanostructures such as h-BN, MoS2, WS2, graphene, among others. The homogeneous nanoparticle distribution within conventional fluids and the results from the thermal transport and tribological tests and observations are included. The nanofluids under investigation belong mainly to dielectric and metal-mechanic lubricants. Also, the mechanisms that promote these effects on the improvement of nanofluids properties are considered.

Nanofluids Properties and Their Applications

Nanofluids Properties and Their Applications
A Book

by Debendra Das Das,Devdatta Kulkarni

  • Publisher : LAP Lambert Academic Publishing
  • Release : 2012-07
  • Pages : 196
  • ISBN : 9783659166099
  • Language : En, Es, Fr & De
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Viscosity, heat transfer and pressure loss measurements of several nanofluids, which are suspensions of nanoparticles less than 100 nm size, in base fluids, e.g. ethylene or propylene glycol and water mixture are presented. The nanoparticles considered here are oxides of aluminum, copper and silicon. Effects of thermophysical properties of nanofluids on the Prandtl number and the Mouromtseff number have been analyzed in detail. Authors show that the Prandtl number increases with increasing particle volumetric concentration, which in turn increases the convective heat transfer coefficients of the nanofluids. Experiments on nanofluids in the turbulent regime show the enhancement of convective heat transfer and pressure loss with an increase in nanoparticles volume concentration. The authors prove that application of nanofluids for heating buildings could result in reduction of volume flow rate of heat transfer fluids, heat exchanger size, and the pumping power. Experiment on a diesel electric generator confirms an increase in the thermal efficiency of the heat recovery from the engine radiator for nanofluids compared to the conventional coolant.

Selected papers of the "1st International Conference on Nanofluids (ICNf)"

Selected papers of the '1st International Conference on Nanofluids (ICNf)'
A Book

by Patrice Estellé,Leonor Hernandez,Matthias H. Buschmann

  • Publisher : MDPI
  • Release : 2020-12-10
  • Pages : 150
  • ISBN : 3039366629
  • Language : En, Es, Fr & De
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This Special Issue of Energies has emerged as a result of the 1st International Conference on Nanofluids (https://icnf2019.com/), which was organized under the auspices of Nanouptake COST Action (Overcoming Barriers to Nanofluids Market Uptake, http://www.nanouptake.eu/) in Castelló (Spain), in June 2019. The foci of ICNf2019 were the production and the characterisation of nanofluids for different areas of applications in the energy fields, namely heat transfer, storage of thermal energy, boiling, and solar systems, as well as industrial applications and health and safety issues. The first conference edition on this topic gathered more than 200 participants from 45 different countries. More than 125 contributions were presented in the nine sections of the congress. Some selected authors were invited to send extended versions of their work to the Energies ICNf2019 Special Issue. After a careful review process, nine articles from six different countries were selected for compilation in this Special Issue: a total of seven full research papers and two reviews. These papers cover a broad range of fundamental and applied research aspects on nanofluid science and development, and reflect the current investigations, knowledge, and challenges encountered in the use of nanofluids for energy applications.

A Review on the Applications of Nanofluids in Solar Energy Field

A Review on the Applications of Nanofluids in Solar Energy Field
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2018
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Abstract: This study provides a critical synthesis on the applications of nanofluids in various types of solar thermal systems. Nanofluids have received attention in recent years due to its importance in various industrial applications especially in the renewable energy field. This work presents the most recent advances of nanofluids in thermal energy storage systems, solar collectors, solar stills, and photovoltaic/thermal systems. With the application of nanomaterials, the efficiency of photovoltaic can increase substantially while reducing the production costs of electricity and manufacturing. This review is structured in three parts: the first part focuses on presenting the latest results for the thermal conductivity, viscosity, specific heat, and the thermal expansion coefficient of nanofluids reported in the literature. The second part of this review is allocated to the applications of nanofluids in different types of solar systems such as solar collectors, solar stills, thermal energy storage systems, and photovoltaic/thermal systems. Finally, the challenges and the bio-engineering safety concerns of using nanofluids in solar energy systems are discussed. Highlights: Promising applications of nanofluids can be found in various solar systems. Nanoparticles are used to enhance the thermal conductivity of nanofluids. Specific heat capacity of nanofluids is anomalous Safety and reduction cost of nanoparticles are the major challenges of nanofluids.

Nanofluids for Heat and Mass Transfer

Nanofluids for Heat and Mass Transfer
Sustainable Manufacturing and Applications

by Bharat Apparao Bhanvase,Divya Prakash Barai

  • Publisher : Academic Press
  • Release : 2021-04-30
  • Pages : 460
  • ISBN : 0128219475
  • Language : En, Es, Fr & De
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Nanofluids for Heat and Mass Transfer: Sustainable Manufacturing and Applications presents the latest on the performance of nanofluids in heat transfer systems. Dr. Bharat Bhanvase investigates characterization techniques and the various properties of nanofluids to analyze their efficiency and abilities in a variety of settings. The book moves through a presentation of the fundamentals of synthesis and nanofluid characterization to various properties and applications. Aimed at academics and researchers focused on heat transfer in energy and engineering disciplines, this book considers sustainable manufacturing processes within newer energy harvesting technologies to serve as an authoritative and well-rounded reference. Highlights the major elements of nanofluids as an energy harvesting fluid, including their preparation methods, characterization techniques, properties and applications Includes valuable findings and insights from numerical and computational studies Provides nanofluid researchers with research inspiration to discover new applications and further develop technologies

Application of Nonlinear Systems in Nanomechanics and Nanofluids

Application of Nonlinear Systems in Nanomechanics and Nanofluids
Analytical Methods and Applications

by Davood Domairry Ganji,Sayyid Habibollah Hashemi Kachapi

  • Publisher : William Andrew
  • Release : 2015-03-19
  • Pages : 412
  • ISBN : 0323353819
  • Language : En, Es, Fr & De
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With Application of Nonlinear Systems in Nanomechanics and Nanofluids the reader gains a deep and practice-oriented understanding of nonlinear systems within areas of nanotechnology application as well as the necessary knowledge enabling the handling of such systems. The book helps readers understand relevant methods and techniques for solving nonlinear problems, and is an invaluable reference for researchers, professionals and PhD students interested in research areas and industries where nanofluidics and dynamic nano-mechanical systems are studied or applied. The book is useful in areas such as nanoelectronics and bionanotechnology, and the underlying framework can also be applied to other problems in various fields of engineering and applied sciences. Provides comprehensive coverage of nano-dynamical systems and their specialized processes and applications in the context of nonlinear differential equations and analytical methods Enables researchers and engineers to better model, interpret and control nanofluidics and other nano-dynamical systems and their application processes Explains nano-dynamical systems by means of describing ‘real-life’ application case studies

Parametric Investigation of Nanofluids Utilization in Parabolic Trough Collectors

Parametric Investigation of Nanofluids Utilization in Parabolic Trough Collectors
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2017
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Highlights: The use of nanofluids in parabolic trough collector is investigated. Al2 O3 and CuO nanoparticles in Syltherm 800 are examined. The thermal performance of the collector is increased close to 0.6% with nanofluids. CuO/Syltherm is the best nanofluid for all the examined temperature levels. Significant enhancement proved for high concentration ratio and low flow rate. Abstract: The objective of this study is to investigate the use of nanofluids in parabolic trough collectors for various cases. The two most usual nanoparticles (Al2 O3 and CuO) are examined in the usual thermal oil Syltherm 800. A detailed thermal model is developed in EES (Engineering Equator Solver) and its results are validated with experimental results from the literature. In the first part of the analysis, the Eurotrough ET-150 module is examined for various inlet temperature levels (25–325 °C) for the three examined working fluids. The results prove that both nanofluids are more efficient than the Syltherm 800, with Syltherm 800/CuO to be the best choice. The heat transfer enhancement with the use of nanofluids is proved to be approximately to 50% and this enhancement is greater at higher temperature levels. In the parametric analysis part, the mean thermal efficiency enhancement is determined for various combinations of flow rates and concentration ratios for both nanofluids. The use of CuO is able to increase the thermal efficiency up to 1.26% and the use of Al2 O3 up to 1.13% when the concentration ratio is maximized and the flow rate is relative low.

Thermal Conductivity Enhancement in Nanofluids -- Mathematical Model

Thermal Conductivity Enhancement in Nanofluids -- Mathematical Model
A Book

by Anand Natchimuthu Chinnaraj

  • Publisher : Unknown Publisher
  • Release : 2011
  • Pages : 262
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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The study on developing a mathematical model for thermal conductivity enhancement in nanofluids was based on formation of nanoparticles into nanoclusters, nanolayer thickness, Brownian motion and volume fraction of nanoclusters. An equation for the thermal conductivity of nanofluids was developed. The expression developed successfully explained the enhanced thermal conductivity of nanofluids and led to some important conclusions. It was found that in this study the nanoparticles tend to form nanoclusters and the volume fraction of the nanoclusters and the trapped fluid in the nanocluster was contributing to the overall thermal conductivity enhancement. Various types of cluster formation was analyzed and it was understood that the nanoparticles forming a spherical nanoclusters are more effective in thermal conductivity enhancement. The contribution of Brownian motion of nanoparticles to the overall thermal conductivity of nanofluids was found to be very small. The study investigated the size distribution of nanoparticles which has been suggested to be an important factor and it gave satisfactory results. The values of the thermal conductivity for different nanofluid combinations were calculated using the expression developed from this study and they agreed with published experimental data. The present model was tested against several nanofluid combinations. To understand the properties that influence the thermal conductivity of nanofluids, parametric studies of a number of nanofluids were carried out. The parameters that were scrutinized to understand thermal conductivity enhancement were nanoparticle diameter, nanolayer thickness and brownian motion. From the study, it was observed that Brownian motion is significant only when the particle diameter is less than 10 nm. From the parametric studies the mathematical model derived in this study was validated. The major factor for the thermal conductivity enhancement in nanofluids is the formations of nanoclusters. The combination of the base fluid and nanoparticles to from nanoclusters will provide better cooling solution than the convention cooling fluids.