Download or read book Modeling of Thermal Performance of Nanofluids with PCM Particles written by Awad Alquaity and published by LAP Lambert Academic Publishing. This book was released on 2015-08-25 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of next generation microchips and other high heat generating applications is constrained by the issue of effective heat removal. One of the most promising methods to enhance heat transfer is to introduce nano-sized phase change material (PCM) particles in the heat transfer fluid. In this work, commercial Computational Fluid Dynamics (CFD) software ANSYS Fluent was employed for modeling the thermal performance of liquid flow with nanosized PCM particles in a microchannel. The research carried out here resulted in a thorough quantitative assessment of heat storage capacity enhancement which can be achieved through the use of nanosized phase change material particles. The results showed tremendous potential for using nanosized phase change materials in liquid heat sinks for effective heat removal in high heat generating applications.
Download or read book Heat Transfer Enhancement with Nanofluids written by Vincenzo Bianco and published by CRC Press. This book was released on 2015-04-01 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Nanoparticle Heat Transfer and Fluid Flow written by W. J. Minkowycz and published by CRC Press. This book was released on 2012-12-04 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Featuring contributions by leading researchers in the field, Nanoparticle Heat Transfer and Fluid Flow explores heat transfer and fluid flow processes in nanomaterials and nanofluids, which are becoming increasingly important across the engineering disciplines. The book covers a wide range, from biomedical and energy conversion applications to materials properties, and addresses aspects that are essential for further progress in the field, including numerical quantification, modeling, simulation, and presentation. Topics include: A broad review of nanofluid applications, including industrial heat transfer, biomedical engineering, electronics, energy conversion, membrane filtration, and automotive An overview of thermofluids and their importance in biomedical applications and heat-transfer enhancement A deeper look at biomedical applications such as nanoparticle hyperthermia treatments for cancers Issues in energy conversion from dispersed forms to more concentrated and utilizable forms Issues in nanofluid properties, which are less predictable and less repeatable than those of other media that participate in fluid flow and heat transfer Advances in computational fluid dynamic (CFD) modeling of membrane filtration at the microscale The role of nanofluids as a coolant in microchannel heat transfer for the thermal management of electronic equipment The potential enhancement of natural convection due to nanoparticles Examining key topics and applications in nanoscale heat transfer and fluid flow, this comprehensive book presents the current state of the art and a view of the future. It offers a valuable resource for experts as well as newcomers interested in developing innovative modeling and numerical simulation in this growing field.
Download or read book Nanofluids written by Sarit K. Das and published by John Wiley & Sons. This book was released on 2007-12-04 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Nano Enhanced Phase Change Materials written by Zafar Said and published by Springer Nature. This book was released on 2023-10-14 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides information on thermal energy storage systems incorporating phase change materials (PCMs) which are widely preferred owing to their immense energy storage capacity. The thermal energy storage (TES) potential of PCMs has been deeply explored for a wide range of applications, including solar/electrothermal energy storage, waste heat storage, and utilization, building energy-saving, and thermal regulations. The inherent shortcomings like leakage during phase transition and poor thermal conductivity hamper their extensive usage. Nevertheless, it has been addressed by their shape stabilization with porous materials and dispersing highly conductive nanoparticles. Nanoparticles suspended in traditional phase change materials enhance the thermal conductivity. The addition of these nanoparticles to the conventional PCM enhances the storage. In this book, the history of Nano Enhanced Phase Change Materials (NEPCM), preparation techniques, properties, theoretical modeling and correlations, and the effect of all these factors on the potential applications such as: solar energy, electronics cooling, heat exchangers, building, battery thermal management, thermal energy storage are discussed in detail. Future challenges and future work scope have been included. The information from this book can enable the readers to come up with novel techniques, resolve existing research limitations, and come up with novel NEPCM, that can be implemented for various applications.
Download or read book Advances in Nanofluid Heat Transfer written by Hafiz Muhammad Ali and published by Elsevier. This book was released on 2022-05-28 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Nanofluid Heat Transfer covers the broad definitions, brief history, preparation techniques, thermophysical properties, heat transfer characteristics, and emerging applications of hybrid nanofluids. Starting with the basics, this book advances step-by-step toward advanced topics, with mathematical models, schematic diagrams and discussions of the experimental work of leading researchers. By introducing readers to new techniques, this book helps readers resolve existing problems and implement nanofluids in innovative new applications. This book provides detailed coverage of stability and reliable measurement techniques for nanofluid properties, as well as different kinds of base fluids. Providing a clear understanding of what happens at the nanoscale, the book is written to be used by engineers in industry as well as researchers and graduate students. Covers new applications of nanofluids, along with key challenges encountered in the commercialization of this technology Highlights new nanofluid properties and associated numerical modeling methods Addresses the very latest topics in nanofluids sciences, such as ionic nanofluids
Download or read book Nanofluids and Their Engineering Applications written by K.R.V. Subramanian and published by CRC Press. This book was released on 2019-06-18 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Hybrid Nanofluids written by Zafar Said and published by Elsevier. This book was released on 2022-01-28 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid Nanofluids: Preparation, Characterization and Applications presents the history of hybrid nanofluids, preparation techniques, thermoelectrical properties, rheological behaviors, optical properties, theoretical modeling and correlations, and the effect of all these factors on potential applications, such as solar energy, electronics cooling, heat exchangers, machining, and refrigeration. Future challenges and future work scope have also been included. The information from this book enables readers to discover novel techniques, resolve existing research limitations, and create novel hybrid nanofluids which can be implemented for heat transfer applications. Describes the characterization, thermophysical and electrical properties of nanofluids Assesses parameter selection and property measurement techniques for the calibration of thermal performance Provides information on theoretical models and correlations for predicting hybrid nanofluids properties from experimental properties
Download or read book Nanofluid Heat and Mass Transfer in Engineering Problems written by Mohsen Sheikholeslami Kandelousi and published by BoD – Books on Demand. This book was released on 2017-03-15 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Thermal Performance of Nanofluids in Miniature Heat Sinks with Conduits written by S. Harikrishnan and published by Springer Nature. This book was released on 2022-01-04 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book focuses on the basic physical features and purpose of nanofluids and miniature heat sinks. The contents demonstrate the design modification, fabrication, experimental investigation, and various applications of miniature heat sinks. The book provides context for thermal performance of miniature heat sinks as well as summaries of experimental results correlations that reflect the current technical innovations are included. This book is a useful reference for both academia and industry alike.
Download or read book Characterization and Modeling of Thermal Diffusion and Aggregation in Nanofluids written by Patricia Elaine Gharagozloo and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluids with higher thermal conductivities are sought for fluidic cooling systems in applications including microprocessors and high-power lasers. By adding high thermal conductivity nanoscale metal and metal oxide particles to a fluid the thermal conductivity of the fluid is enhanced. While particle aggregates play a central role in recent models for the thermal conductivity of nanofluids, the effect of particle diffusion in a temperature field on the aggregation and transport has yet to be studied in depth. The present work separates the effects of particle aggregation and diffusion using parallel plate experiments, infrared microscopy, light scattering, Monte Carlo simulations, and rate equations for particle and heat transport in a well dispersed nanofluid. Experimental data show non-uniform temporal increases in thermal conductivity above effective medium theory and can be well described through simulation of the combination of particle aggregation and diffusion. The simulation shows large concentration distributions due to thermal diffusion causing variations in aggregation, thermal conductivity and viscosity. Static light scattering shows aggregates form more quickly at higher concentrations and temperatures. An optimum nanoparticle diameter for these particular fluid properties is calculated to be 130 nm to optimize the fluid stability by reducing settling, thermal diffusion and aggregation.
Download or read book Thermal Characteristics and Convection in Nanofluids written by Aditya Kumar and published by Springer Nature. This book was released on 2021-01-04 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers synthesis, characterization, stability, heat transfer and applications of nanofluids. It includes different types of nanofluids, their preparation methods as well as its effects on the stability and thermophysical properties of nanofluids. It provides a discussion on the mechanism behind the change in the thermal properties of nanofluids and heat transfer behaviour. It presents the latest information and discussion on the preparation and advanced characterization of nanofluids. It also consists of stability analysis of nanofluids and discussion on why it is essential for the industrial application. The book provides a discussion on thermal boundary layer properties in convection. Future directions for heat transfer applications to make the production and application of nanofluids at industrial level are also discussed.
Download or read book Photovoltaic Thermal PV T Systems written by Ali H. A. Al-Waeli and published by Springer Nature. This book was released on 2019-10-25 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the most up-to-date information on hybrid solar cell and solar thermal collectors, which are commonly referred to as Photovoltaic/Thermal (PV/T) systems. PV/T systems convert solar radiation into thermal and electrical energy to produce electricity, utilize more of the solar spectrum, and save space by combining the two structures to cover lesser area than two systems separately. Research in this area is growing rapidly and is highlighted within this book. The most current methods and techniques available to aid in overall efficiency, reduce cost and improve modeling and system maintenance are all covered. In-depth chapters present the background and basic principles of the technology along with a detailed review of the most current literature. Moreover, the book details design criteria for PV/T systems including residential, commercial, and industrial applications. Provides an objective and decisive source for the supporters of green and renewable source of energy Discusses and evaluates state-of-the-art PV/T system designs Proposes and recommends potential designs for future research on this topic
Download or read book Nanoscale Flow written by Sarhan M. Musa and published by CRC Press. This book was released on 2018-09-03 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the physical properties and dynamical behavior of nanochannel flows has been of great interest in recent years and is important for the theoretical study of fluid dynamics and engineering applications in physics, chemistry, medicine, and electronics. The flows inside nanoscale pores are also important due to their highly beneficial drag and heat transfer properties. Nanoscale Flow: Advances, Modeling, and Applications presents the latest research in the multidisciplinary area of nanoscale flow. Featuring contributions from top inventors in industry, academia, and government, this comprehensive book: Highlights the current status of research on nucleate pool boiling heat transfer, flow boiling heat transfer, and critical heat flux (CHF) phenomena of nanofluids Describes two novel fractal models for pool boiling heat transfer of nanofluids, including subcooled pool boiling and nucleate pool boiling Explores thermal conductivity enhancement in nanofluids measured with a hot-wire calorimeter Discusses two-phase laminar mixed convection AL2O3–water nanofluid in an elliptic duct Explains the principles of molecular and omics imaging and spectroscopy techniques for cancer detection Analyzes fluid dynamics modeling of the tumor vasculature and drug transport Studies the properties of nanoscale particles and their impact on diagnosis, therapeutics, and theranostics Provides a brief background and review of medical nanoscale flow applications Contains useful appendices of physical constants, equations, common symbols, mathematical formulas, the periodic table, and more A valuable reference for engineers, scientists, and biologists, Nanoscale Flow: Advances, Modeling, and Applications is also designed for researchers, universities, industrial institutions, and government, giving it broad appeal.
Download or read book Characterization and Modeling of Thermal Diffusion and Aggregation in Nanofluids written by and published by . This book was released on 2010 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluids with higher thermal conductivities are sought for fluidic cooling systems in applications including microprocessors and high-power lasers. By adding high thermal conductivity nanoscale metal and metal oxide particles to a fluid the thermal conductivity of the fluid is enhanced. While particle aggregates play a central role in recent models for the thermal conductivity of nanofluids, the effect of particle diffusion in a temperature field on the aggregation and transport has yet to be studied in depth. The present work separates the effects of particle aggregation and diffusion using parallel plate experiments, infrared microscopy, light scattering, Monte Carlo simulations, and rate equations for particle and heat transport in a well dispersed nanofluid. Experimental data show non-uniform temporal increases in thermal conductivity above effective medium theory and can be well described through simulation of the combination of particle aggregation and diffusion. The simulation shows large concentration distributions due to thermal diffusion causing variations in aggregation, thermal conductivity and viscosity. Static light scattering shows aggregates form more quickly at higher concentrations and temperatures, which explains the increased enhancement with temperature reported by other research groups. The permanent aggregates in the nanofluid are found to have a fractal dimension of 2.4 and the aggregate formations that grow over time are found to have a fractal dimension of 1.8, which is consistent with diffusion limited aggregation. Calculations show as aggregates grow the viscosity increases at a faster rate than thermal conductivity making the highly aggregated nanofluids unfavorable, especially at the low fractal dimension of 1.8. An optimum nanoparticle diameter for these particular fluid properties is calculated to be 130 nm to optimize the fluid stability by reducing settling, thermal diffusion and aggregation.
Download or read book Studies on Thermophysical Properties of Nanofluids and Their Application in Ground Source Heat Pump written by Jagannadha Reddy Satti and published by . This book was released on 2015 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goals of this dissertation were to measure the thermal conductivity, specific heat, and density of different propylene glycol nanofluids; compare the results with existing correlations; and develop new correlations with the obtained data. A numerical study has been performed to study the benefits of nanofluids in cold climate ground source heat pumps. Nanofluids are dispersions of nanoparticles with average sizes of less than 100 nm in heat transfer fluids such as water, oil, ethylene glycol, and propylene glycol. In cold regions, the common heat transfer fluids used are ethylene glycol (EG) and propylene glycol (PG). In the present research, a propylene glycol (PG) and 40% water (W) by mass fluid mixture was used as a base fluid, which has a freezing point of -51.1 0C. Experiments were conducted to measure the density of several nanofluids containing nanoscale particles of aluminum oxide (Al2O3), zinc oxide (ZnO), copper oxide (CuO), titanium oxide (TiO2), and silicon dioxide (SiO2). These particles were individually dispersed in a base fluid of 60:40 propylene glycol and water (PG/W) by mass. Additionally, Carbon Nanotubes (CNT) dispersed in deionized water (DI) were also tested. Initially, a benchmark test was performed on the density of the base fluid in the temperature range of 0°C to 90°C. The measurements were performed with different particle volumetric concentrations from 0 to 6% and nanoparticle sizes ranging from 10 to 76 nm. The temperature range of the measurements was from 0° to 90°C. These results were compared with the values predicted by a currently acceptable theoretical equation for nanofluids. The experimental results showed good agreement with the theoretical equation, with a maximum deviation of -3.8% for copper oxide nanofluid and an average deviation of -0.1% for all the nanofluids tested. An experimental study has been carried out to determine the thermal conductivity of five different nanofluids, containing aluminum oxide, copper oxide, zinc oxide, silicon dioxide, and titanium dioxide nanoparticles, dispersed in a base fluid of 60:40 (by mass) propylene glycol and water. The effect of particle volumetric concentrations up to 6% was studied with temperatures ranging from 243K to 363K. The thermal conductivity of nanofluids showed a direct relationship with particle volumetric concentration, particle size, properties, and temperature. Several existing theoretical models for thermal conductivity of nanofluids were compared with the experimental data, but they all showed some disagreement. Therefore, the most agreeable model was selected and refined for propylene glycol nanofluids. This model considered the thermal conductivity of nanofluids as a function of Brownian motion, Biot number, fluid temperature, particle volumetric concentration, and the properties of the nanoparticles and base fluid. This model provided good agreement with 600 experimental data points of five nanofluids, with an average absolute deviation of 1.79 percent. Specific heat was measured for five different nanofluids containing aluminum oxide (Al2O3), zinc oxide (ZnO), copper oxide (CuO), titanium oxide (TiO2), and silicon dioxide (SiO2) nanoparticles dispersed in a base fluid of 60% propylene glycol and 40% water by mass (60:40 PG/W). The measurements were carried out over a temperature range of -30°C to 90°C, for nanoparticle volumetric concentrations of 0.5% to 6%, and for average particle sizes ranging from 10 nm to 45 nm to evaluate their effects on the specific heat. From comparison, it was found that the existing specific heat correlations were not able to predict the measured experimental values, therefore, a new correlation was developed to predict the specific heat of various 60:40 PG/W based nanofluids. This new correlation is in good agreement with 610 experimental data points of the five nanofluids, with a maximum deviation of -5% exhibited by the Al2O3 nanofluid and an average deviation of -0.094% for all five nanofluids. The COP of a GSHP in cold climates is limited by the circulation of heat transfer fluid in a ground heat exchanger loop at very low temperatures. This requires a greater tube length in the ground heat exchanger to absorb an adequate amount of heat. One way to increase the COP of a GSHP is by replacing the heat transfer fluid with more efficient fluid, such as a nanofluid. In this paper, a GSHP operating in central Alaska is analyzed. Analytical and numerical studies were performed on the ground heat exchanger of the GSHP. Results calculated from modeling showed good agreement with experimental data for a conventional heat transfer fluid, a methanol and water mixture, validating the models. Next, the analysis were performed using Al2O3 and CuO nanofluids with three different particle volumetric concentrations, 0.5, 1, and 2%. The results showed nanofluids absorbed more heat than the basefluid. The ground temperature was varied from 273 to 288K and the fluid velocity from 1 m/s to 5 m/s. The best heat absorption rate of 12% over the basefluid was observed for an Al2O3 nanofluid of 2% concentration at a ground temperature of 273K.
Download or read book Hybrid Nanofluids for Convection Heat Transfer written by Hafiz Muhammad Ali and published by Academic Press. This book was released on 2020-05-15 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
