Download or read book Enhancement of Pool Boiling Critical Heat Flux in Dielectric Liquids written by Mehmet Arik and published by . This book was released on 2001 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanoscale Modification of Key Surface Parameters to Augment Pool Boiling Heat Transfer and Critical Heat Flux in Water and Dielectric Fluids written by Eric Christopher Forrest and published by . This book was released on 2009 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Results indicate that the low global warming potential fluorinated ketone may be a viable alternative in the cooling of electronic devices. Additionally, results demonstrate that enhancement of boiling heat transfer is possible for well-wetting dielectric fluids, with 40% enhancement in the critical heat flux using dilute suspensions of aluminum or silica nanoparticles in the fluorinated ketone.
Download or read book Measurement and Prediction of the Pool Boiling Critical Heat Flux in Highly Wetting Liquids written by Abhay Ashok Watwe and published by . This book was released on 1996 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodynamic Aspects of Boiling Heat Transfer written by N. Zuber and published by . This book was released on 1959 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pool Boiling Heat Transfer with Highly wetting Dielectric Fluids written by Seung Mun You and published by . This book was released on 1990 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Heat Transfer written by Young I. Cho and published by Academic Press. This book was released on 2011-11-28 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Heat Transfer fills the information gap between regularly scheduled journals and university-level textbooks by providing in-depth review articles over a broader scope than in journals or texts. The articles, which serve as a broad review for experts in the field, will also be of great interest to non-specialists who need to keep up-to-date with the results of the latest research. This serial is essential reading for all mechanical, chemical and industrial engineers working in the field of heat transfer, graduate schools or industry. Provides an overview of review articles on topics of current interest Bridges the gap between academic researchers and practitioners in industry A long-running and prestigious series
Download or read book Pool Boiling from Enhanced Structures Under Confinement written by Camil-Daniel Ghiu and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of pool boiling of a dielectric liquid (PF 5060) from single-layered enhanced structures was conducted. The parameters investigated were the heat flux, the width of the microchannels and the microchannel pitch. The boiling performance of the enhanced structures increases with increase in channel width and decrease in channel pitch. Simple single line curve fits are provided as a practical way of predicting the data over the entire nucleate boiling regime. The influence of confinement on the thermal performance of the enhanced structures was also assessed. The main parameter investigated was the top space (0 mm 3{13 mm). High-speed visualization was used as a tool . For the total confinement (= 0 mm), the heat transfer performance of the enhanced structures was found to depend weakly on the channel width. For>0 mm, the enhancement observed for plain surfaces in the low heat fluxes regime is not present for the present enhanced structure. The maximum heat flux for a prescribed 85 °C surface temperature limit increased with the increase of the top spacing, similar to the plain surfaces case. Two characteristic regimes of pool boiling have been identified and described: isolated flattened bubbles regime and coalesced bubbles regime. A semi-analytical predictive model applicable to pool boiling under confinement is developed. The model requires a limited number of empirical constants and is capable of predicting the experimental heat flux within 30%.
Download or read book Advances in Heat Transfer written by Ephraim M. Sparrow and published by Academic Press. This book was released on 2021-12-01 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Heat Transfer, Volume 53 in this long-running serial, highlights new advances in the field, with this new volume presenting interesting chapters written by an international board of authors. Provides the authority and expertise of leading contributors from an international board of authors Presents the latest release in the Advances in Heat Transfer series
Download or read book Nucleate Pool Boiling of High Dielectric Fluids from Enhanced Surfaces written by Victor Joseph Lepere (Jr) and published by . This book was released on 1980 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results of the heat transfer performance of three enhanced surfaces, a Union Carbide, Linde High Flux, a Hitachi Thermoexcel-E, a Wieland Gewa-T, and a plain copper surface in the nucleate pool boiling regime in R-113 and FC-72 are presented. Prior to obtaining the data, each of the surfaces was subjected to one of three initial conditions, and the effect of past history on boiling incipience was observed. The data showed that all the surfaces behaved in a similar manner prior to the onset of boiling. Temperature overshoots were most pronounced for the initial condition in which the surfaces were submerged in the liquid pool overnight. All of the enhanced surfaces exhibited a two to tenfold increase in the heat transfer coefficient when compared to the plain surface. The High Flux surface was most effective over a broad range of heat fluxes. The Hitachi surface showed a similar gain in heat transfer coefficient to that of the High Flux surface below 10 kW/sq m, while the Gewa-T surface was not as effective as the other surfaces at low heat fluxes. At high fluxes, the Gewa-T surface performed in a comparable if not better manner. (Author).
Download or read book Handbook of Thermal Science and Engineering written by and published by Springer. This book was released on 2018-07-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Handbook provides researchers, faculty, design engineers in industrial R&D, and practicing engineers in the field concise treatments of advanced and more-recently established topics in thermal science and engineering, with an important emphasis on micro- and nanosystems, not covered in earlier references on applied thermal science, heat transfer or relevant aspects of mechanical/chemical engineering. Major sections address new developments in heat transfer, transport phenomena, single- and multiphase flows with energy transfer, thermal-bioengineering, thermal radiation, combined mode heat transfer, coupled heat and mass transfer, and energy systems. Energy transport at the macro-scale and micro/nano-scales is also included. The internationally recognized team of authors adopt a consistent and systematic approach and writing style, including ample cross reference among topics, offering readers a user-friendly knowledgebase greater than the sum of its parts, perfect for frequent consultation. The Handbook of Thermal Science and Engineering is ideal for academic and professional readers in the traditional and emerging areas of mechanical engineering, chemical engineering, aerospace engineering, bioengineering, electronics fabrication, energy, and manufacturing concerned with the influence thermal phenomena.
Download or read book Induced Convective Enhancement of the Critical Heat Flux for Partially Heated Surfaces in Pool Boiling written by Todd S. Bockwoldt and published by . This book was released on 1990 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Critical Heat Flux for Saturated Pool Boiling from Horizontal and Vertical Wires in Reduced Gravity written by Robert Siegel and published by . This book was released on 1965 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Critical Heat Flux in an Accelerating Pool Boiling System written by Jim Mills Adams and published by . This book was released on 1962 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Liquid Height on Pool Boiling Heat Transfer written by Maharshi Y. Shukla and published by . This book was released on 2020 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: "As technology advances due to continuous research, devices are becoming more compact, efficient, and powerful. Therefore, heat rejection from such devices becomes ever so critical to maximizing their potential. Compared to other heat extraction methods, boiling provides one of the highest heat transfer coefficients. The heat extraction due to the boiling process is limited to the Critical Heat Flux (CHF). At CHF, an insulating layer of escaping bubbles forms upon the surface to prevent boiling continuity. Subsequently, the surface temperature increases uncontrollably, leading to a system failure. Hence, the elevation of CHF is critical to boiling enhancement. Improvements to the heat transfer process can be made with either surface manipulation or liquid manipulation. Based on previous studies, it is found that the removal of bubbles from the heater surface is critical to enhancing performance. Therefore, it is hypothesized that if a bubble can be encouraged to reach liquid-gas the interface quickly, gains in the boiling performance can be achieved. Due to the vapor bubble's movement in liquid bulk, it becomes critical to understand the influence of liquid height on pool boiling for enhancement. While pool boiling enhancement using heating surface modification is extensively studied and documented, there is a research gap between understanding the effect of liquid height at high heat fluxes. Thus, this study tries to evaluate the influence of liquid height on pool boiling performance at higher heat fluxes and identify the underlying bubble movement mechanism. It is observed that as CHF increases with liquid height. Moreover, it is observed that bubble movement is more effortless at low liquid height resulting in higher HTC. On the other hand, larger liquid height provides improved rewetting of the surface resulting in higher CHF. Upon analysis of high-speed recording of the escaping bubbles, it was observed that the maximum heat transfer coefficient is observed when the liquid height is about four times the height of the departing bubble diameter."--Abstract.
Download or read book High Heat Fluid Dissipation Using Innovative Dual Tapered Manifold in Pool Boiling and Thermosiphon Loop for CPU Cooling in Data Centers written by Aranya Chauhan and published by . This book was released on 2021 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The current trend of electronics miniaturization presents thermal challenges which limit the performance of processors. The high heat fluxes in CPUs are affecting the reliability and processing ability of the servers. Due to these thermal limitations, large amount of energy is required to cool the servers in data centers. The advanced two-phase boiling heat transfer systems are significantly more efficient than currently used single phase coolers. In the current work, a novel approach is adopted by using a dual tapered microgap over the heated boiling surface for enhanced heat transfer. The theoretical work has identified the role of two-phase pressure recovery effect induced by the expanding bubbles in the tapered microgap configuration that leads to a self-sustained flow over the heater surface. This effectively transforms the pool boiling into a pumpless flow boiling system. Additionally, the tapered microgap introduces a bubble squeezing effect that pushes the liquid along the expanding taper direction. High fluid velocities are generated through this mechanism thus creating the pumpless flow boiling process in a conventional pool boiling system. Using water as the working fluid, a critical heat flux (CHF) of 288 W/cm2 was achieved at a wall superheat of 24.1°C. The baseline configuration without any tapered manifold resulted in a CHF of 124 W/cm2 at a wall superheat of 23.8°C. This represents the largest enhancement ever reported for water on a plain surface without incorporating any surface modifications during pool boiling. For dielectric liquid as the working fluid, the dual tapered micogap obtained ~2X enhancement in the heat transfer coefficient (HTC) compared to the configuration with the baseline configuration. This dual tapered microgap design is also implemented in a thermosiphon loop for CPU cooling where no pumping power is required for fluid circulation in a closed loop. The loop contains an evaporator with a dual tapered microgap and was able to dissipate heat from an actual CPU (i7-930 processor, TDP 130W) more efficiently as compared to air, or water-based coolers during thermal stress tests. This dual taper evaporator configuration will be able to mitigate the hotspots generated on the CPU surface and improve the efficiency and mechanical integrity of the processor. Such boiling heat transfer systems can significantly reduce the cooling water temperature requirement thereby reducing the operational cost of data centers."--Abstract.
Download or read book Nanofluids written by S. M. Sohel Murshed and published by Nova Science Publishers. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book FeCrAl Sputtering Technique to Enhance Pool Boiling Critical Heat Flux written by Sung Joong Kim and published by . This book was released on 2017-06-29 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
