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• Author : Ali Kosar,Abdolali Sadaghiani
• Publisher :Unknown
• Release Date :2021-06-15
• Total pages :304
• ISBN : 0128169230

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Summary : Nanofluid Boiling presents valuable insights into boiling heat transfer mechanisms, offering state-of-the-art techniques for overcoming obstacles against nanofluid applications. In addition, the book points out emerging industrial applications and guides researchers and engineers in their research and design efforts. In addition, recommendations on future research directions and the design of systems involving nanofluids are presented at the end of each chapter. The book's authors comprehensively cover mechanisms, parametric effects and enhancement techniques in the boiling of nanofluids, providing updated, detailed information about recent developments and findings. Gives insights into nanofluid boiling heat transfer mechanisms Offers state-of-the-art techniques for overcoming challenges and difficulties in the applications of nanofluids Presents the most updated information about nanofluid boiling heat transfer, mechanisms of heat transfer, and critical heat flux enhancements Focuses on parametric effects, such as nanofluid properties (size, concentration, nanoparticle type), preparation methods on heat transfer and critical heat flux mechanisms, bubble dynamics, flow patterns and pressure drop

• Author : Liqiu Wang
• Publisher :Unknown
• Release Date :2009-10-15
• Total pages :246
• ISBN : 9783642026904

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Summary : The term transport phenomena is used to describe processes in which mass, momentum, energy and entropy move about in matter. Advances in Transport Phenomena provide state-of-the-art expositions of major advances by theoretical, numerical and experimental studies from a molecular, microscopic, mesoscopic, macroscopic or megascopic point of view across the spectrum of transport p- nomena, from scientific enquiries to practical applications. The annual review series intends to fill the information gap between regularly published journals and university-level textbooks by providing in-depth review articles over a broader scope than in journals. The authoritative articles, contributed by international- leading scientists and practitioners, establish the state of the art, disseminate the latest research discoveries, serve as a central source of reference for fundamentals and applications of transport phenomena, and provide potential textbooks to senior undergraduate and graduate students. The series covers mass transfer, fluid mechanics, heat transfer and thermo- namics. The 2009 volume contains the four articles on biomedical, environmental and nanoscale transports. The editorial board expresses its appreciation to the c- tributing authors and reviewers who have maintained the standard associated with Advances in Transport Phenomena. We also would like to acknowledge the efforts of the staff at Springer who have made the professional and attractive pr- entation of the volume. Serial Editorial Board Editor-in-Chief Professor L. Q. Wang The University of Hong Kong, Hong Kong; [email protected] hk Editors Professor A. R. Balakrishnan Indian Institute of Technology Madras, India Professor A.

• Author : Ali Kosar,Abdolali Sadaghiani
• Publisher :Unknown
• Release Date :2021-11-01
• Total pages :304
• ISBN : 9780128169247

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Summary : Nanofluid Boiling presents valuable insights into boiling heat transfer mechanisms, offering state-of-the-art techniques for overcoming obstacles against nanofluid applications. In addition, the book points out emerging industrial applications and guides researchers and engineers in their research and design efforts. In addition, recommendations on future research directions and the design of systems involving nanofluids are presented at the end of each chapter. The book's authors comprehensively cover mechanisms, parametric effects and enhancement techniques in the boiling of nanofluids, providing updated, detailed information about recent developments and findings. Gives insights into nanofluid boiling heat transfer mechanisms Offers state-of-the-art techniques for overcoming challenges and difficulties in the applications of nanofluids Presents the most updated information about nanofluid boiling heat transfer, mechanisms of heat transfer, and critical heat flux enhancements Focuses on parametric effects, such as nanofluid properties (size, concentration, nanoparticle type), preparation methods on heat transfer and critical heat flux mechanisms, bubble dynamics, flow patterns and pressure drop

• Author : John R Thome
• Publisher :Unknown
• Release Date :2018-05-18
• Total pages :1372
• ISBN : 9789813234383

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Summary : Set IV is a new addition to the previous Sets I, II and III. It contains 23 invited chapters from international specialists on the topics of numerical modeling of pulsating heat pipes and of slug flows with evaporation; lattice Boltzmann modeling of pool boiling; fundamentals of boiling in microchannels and microfin tubes, CO2 and nanofluids; testing and modeling of micro-two-phase cooling systems for electronics; and various special topics (flow separation in microfluidics, two-phase sensors, wetting of anisotropic surfaces, ultra-compact heat exchangers, etc.). The invited authors are leading university researchers and well-known engineers from leading corporate research laboratories (ABB, IBM, Nokia Bell Labs). Numerous 'must read' chapters are also included here for the two-phase community. Set IV constitutes a 'must have' engineering and research reference together with previous Sets I, II and III for thermal engineering researchers and practitioners.

• Author : Vincenzo Bianco,Oronzio Manca,Sergio Nardini,Kambiz Vafai
• Publisher :Unknown
• Release Date :2015-04-01
• Total pages :481
• ISBN : 9781482254020

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Summary : 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.

• Author : Sarit K. Das,Stephen U. Choi,Wenhua Yu,T. Pradeep
• Publisher :Unknown
• Release Date :2007-12-04
• Total pages :485
• ISBN : 9780470180686

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Summary : 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.

• Author : Wu Fan
• Publisher :Unknown
• Release Date :2011-10-24
• Total pages :5850
• ISBN : 9783038137085

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Summary : Volume is indexed by Thomson Reuters CPCI-S (WoS). These proceedings comprise fully-refereed papers presented at the conference. The main conference theme was Mechanical and Aerospace Engineering, and the main goal of the event was to provide an international scientific forum for the exchange of new ideas in a number of fields and for in-depth discussions with peers from around the world. Core areas of mechanical and aerospace engineering are covered, together with multidisciplinary, interdisciplinary research and applications; thus making the work an excellent guide to those topics.

• Author : Anonim
• Publisher :Unknown
• Release Date :2004
• Total pages :229
• ISBN : PSU:000054738805

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• Author : Adya Karthikeyan
• Publisher :Unknown
• Release Date :2018
• Total pages :229
• ISBN : OCLC:1042255990

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Summary : "In this Ph.D. thesis, an ethanol based carbon nanotube nanofluid was developed, which remains stable, i.e., the nanotubes remain well dispersed in the fluid without agglomerating, when in contact with metals and when boiled. This nanofluid was combined with a laser textured metal surface to obtain a 59 % enhancement in the nucleate boiling heat transfer rate. As a first step, the effect of colloidal stability on the wetting behavior of nanofluids was studied, since it is a significant coolant property that influences boiling heat transfer. The study revealed that the surface tension of stable nanofluids increases linearly with an increase in the concentration of nanoparticles beyond a threshold concentration. However, unstable nanofluids do not follow a clear trend in the variation of wetting behavior with nanoparticle loading. The results showed that the colloidal stability of nanofluids affects its physical properties. Since heat exchangers are metallic structures, ensuring the stability of nanofluids when in contact with metals and when boiled is a necessary criterion to qualify them for boiling heat transfer applications. Ethanol based nanofluid remained visibly stable on boiling and continued to remain so even after two years of being in contact with a copper coupon. The stability of this nanofluid was confirmed by monitoring the mean particle size using dynamic light scattering technique. The interaction between the base liquid molecules and the functionalized carbon nanotubes in the different nanofluids were analysed using Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. From the test results, the exceptional stability of ethanol based nanofluids is confirmed to be due to the presence of strong hydrogen bonding between the ethanol molecules and functional groups on carbon nanotubes. The development of a novel nanofluid which remains stable when boiled motivated us to study the effect of nanofluid stability on boiling heat transfer. The presence of well dispersed nanoparticles in a stable nanofluid increases the rate of nucleate boiling heat transfer compared to the base liquid. However, deposition of agglomerates on the heater surface is pointed out as one of the reasons for the variation in boiling heat transfer in literature. But, it is speculated that the uniformity, density, and roughness of this deposition may not be predictable or reproducible.Femtosecond laser micromachining is a technique used to create uniformly ordered structures of micro nanoscale roughness on metal surfaces. This process was used to prepare textured heater surfaces for boiling heat transfer study. The boiling heat transfer rate increased with increase in surface roughness. With every textured surface, the cooling rate was higher with the stable nanofluid compared to the base liquid. In addition to this, heat transfer increased with an increase in the number of textured patches. This is because the patch edges act as low resistance vapor entrainment paths, which aids in boiling heat transfer. This assumption was further proved using micropillar structures, which contain a high number of micrometer scale edges. It can be concluded from this study that boiling heat transfer rate increases with increase in the number of edges present on the heater surface. " --

• Author : Anonim
• Publisher :Unknown
• Release Date :2006
• Total pages :1394
• ISBN : UOM:39015069153909

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• Author : Sung Joong Kim (Ph. D.)
• Publisher :Unknown
• Release Date :2007
• Total pages :166
• ISBN : OCLC:214327112

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Summary : Nanofluids are engineered colloidal suspensions of nanoparticles in water, and exhibit a very significant enhancement (up to 200%) of the boiling Critical Heat Flux (CHF) at modest nanoparticle concentrations (50.1% by volume). Since CHF is the upper limit of nucleate boiling, such enhancement offers the potential for major performance improvement in many practical applications that use nucleate boiling as their prevalent heat transfer mode. The nuclear applications considered are main reactor coolant for PWR, coolant for the Emergency Core Cooling System (ECCS) of both PWR and BWR, and coolant for in-vessel retention of the molten core during severe accidents in high-power-density LWR. To implement such applications it is necessary to understand the fundamental boiling heat transfer characteristics of nanofluids. The nanofluids considered in this study are dilute dispersions of alumina, zirconia, and silica nanoparticles in water. Several key parameters affecting heat transfer (i.e., boiling point, viscosity, thermal conductivity, and surface tension) were measured and, consistently with other nanofluid studies, were found to be similar to those of pure water. However, pool boiling experiments showed significant enhancements of CHF in the nanofluids. Scanning Electron Microscope (SEM) and Energy Dispersive Spectrometry (EDS) analyses revealed that buildup of a porous layer of nanoparticles on the heater surface occurred during nucleate boiling. This layer significantly improves the surface wettability, as shown by measured changes in the static contact angle on the nanofluid-boiled surfaces compared with the pure-water-boiled surfaces. It is hypothesized that surface wettability improvement may be responsible for the CHF enhancement.

• Author : Pankaj Saha,P.M.V. Subbarao,Basant Singh Sikarwar
• Publisher :Unknown
• Release Date :2019-04-23
• Total pages :847
• ISBN : 9789811364167

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Summary : This book comprises select proceedings of the International Conference on Future Learning Aspects of Mechanical Engineering (FLAME 2018). The book gives an overview of recent developments in the field of thermal and fluid engineering, and covers theoretical and experimental fluid dynamics, numerical methods in heat transfer and fluid mechanics, different modes of heat transfer, multiphase transport and phase change, fluid machinery, turbo machinery, and fluid power. The book is primarily intended for researchers and professionals working in the field of fluid dynamics and thermal engineering.

• Author : Anonim
• Publisher :Unknown
• Release Date :2004
• Total pages :229
• ISBN : UOM:39076002388044

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• Author : Jonathan Torres
• Publisher :Unknown
• Release Date :2011
• Total pages :67
• ISBN : OCLC:773789384

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Summary : The effects of nanofluids on water drops impinging onto heated surfaces are studied. This includes analyzing the drop spreading and boiling behavior. In order to view the impingement of the drops, a transparent ITO (Indium Tin Oxide) coated quartz glass is modified into a transparent heater and is used to simulate the heated surface. Two different concentrations of alumina oxide nanoparticles are studied and compared to pure water. The drops are studied under 4 different Weber number conditions and surface temperatures in the range 100°C-200°C and 275°C. The boiling regions observed in this studied ranged from the convective boiling region to the film boiling region. Boiling properties of the drop are visualized with a high speed image acquisition system. The spread behavior of the droplets is studied and compared with analytical theories. Boiling behavior is significantly altered with the addition of nanofluids most significantly in the nucleate boiling region. Nanofluid drops show an increase in bubble production and growth when compared to pure water drops. As a result, the nanofluid drops experience a more intense nucleation boiling than water drops. The Leidenfrost temperature is also studied for the different nanofluid concentrations. Furthermore results show that nanofluids prevented the formation of dry areas at certain We and Ts, but when dry areas are present they last longer. Last, the spreading behavior of nanofluid drops registered higher Îø values especially at the higher Ts when compared to pure water. This is due to their increased amount of nucleation during the boiling of the drop.

• Author : American Nuclear Society
• Publisher :Unknown
• Release Date :1958
• Total pages :229
• ISBN : UOM:39015065057815

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• Author : S. M. Sohel Murshed,C. A. Nieto de Castro
• Publisher :Unknown
• Release Date :2014-01-01
• Total pages :282
• ISBN : 1633216772

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Summary : 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.

• Author : Bao Hoai Truong
• Publisher :Unknown
• Release Date :2007
• Total pages :106
• ISBN : OCLC:221271996

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Summary : Nanofluids are engineered colloids composed of nano-size particles dispersed in common fluids such as water or refrigerants. Using an electrically controlled wire heater, pool boiling Critical Heat Flux (CHF) of Alumina and Silica water-based nanofluids of concentration less than or equal to 0.1 percent by volume were measured. Silica nanofluids showed CHF enhancement up to 68% and there seems to be a monotonic relationship between nanoparticle concentration and magnitude of enhancement. Alumina nanofluids had CHF enhancement up to 56% but the peak occurred at the intermediate concentration. The boiling curves in nanofluid were found to shift to the left of that of water and correspond to higher nucleate boiling heat transfer coefficients in the two-phase flow regime. SEM images show a porous coating layer of nanoparticles on wires subjected to nanofluid CHF tests. These coating layers change the morphology of the heater's surface, and are responsible for the CHF enhancement. The thickness of the coating was estimated using SEM and was found ranging from 3.0 to 6.0 micrometers for Alumina, and 3.0 to 15.0 micrometers for Silica. Inductively Coupled Plasma Spectroscopy (ICP-OES) analyses were also attempted to quantify the mass of the particle deposition but the results were inconsistent with the estimates from the SEM measurement.

• Author : R. P. Reddy,Ramakrishna N. Hegde,Shrikantha S. Rao
• Publisher :Unknown
• Release Date :2012
• Total pages :22
• ISBN : OCLC:1251664781

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Summary : This paper presents the experimental outcome of a study of the pool boiling heat transfer characteristics of alumina and CuO nanofluid in distilled water using a 0.19 mm diameter NiCr wire. A series of experiments were conducted in order to visualize the flow, critical heat flux (CHF) enhancement, and transient characteristics of nanofluid. The boiling phenomenon was visualized using a 0.1 g/l concentration of alumina nanofluid. The average bubble diameter was measured and was found to increase with increased heat flux. The average bubble contact angle decreased from 69° during the initial stages of boiling to 33° at CHF. Massive vapour bubbles were observed on the test heater surface near the CHF, inducing vapour blankets and forming hot/dry spots. The increase in the CHF could be well explained by the hot/dry spot theory. Pool boiling experiments conducted using low volume concentrations of CuO-water nanofluid at atmospheric pressure in distilled water showed an increase in the CHF by 30 % at a 0.3 g/l concentration. The transient behaviour of nanofluid, examined by exposing the heater surface at a constant heat flux of 700 kW/m2, indicated CHF enhancement of 5.21 % to 6.77 % for the two time durations. Based on the experimental investigations, it was concluded that the CHF enhancement is due to nanoparticle coating, which changes the thickness of the surface as a function of time and surface wettability and corroborates the hot/dry spot theory.

• Author : Indian Institute of Science, Bangalore
• Publisher :Unknown
• Release Date :2009
• Total pages :229
• ISBN : UCSD:31822009605254

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• Author : Anonim
• Publisher :Unknown
• Release Date :2007
• Total pages :229
• ISBN : STANFORD:36105123652443

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• Author : K.R.V. Subramanian,Tubati Nageswara Rao,Avinash Balakrishnan
• Publisher :Unknown
• Release Date :2019-06-18
• Total pages :498
• ISBN : 9780429886980

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Summary : 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