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Enhanced Boiling Heat Transfer From Micro Porous Surfaces
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Book Synopsis Enhanced Boiling Heat Transfer by : John R. Thome
Download or read book Enhanced Boiling Heat Transfer written by John R. Thome and published by CRC Press. This book was released on 1990-01-01 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a comprehensive survey of boiling heat transfer augmentation, one of the most dynamic areas in the field. The text covers fundamental aspects of boiling augmentation and provides an in-depth treatment of enhanced boiling surface applications in industry.
Book Synopsis Enhanced Boiling Heat Transfer from Micro-porous Surfaces by : Je Young Chang
Download or read book Enhanced Boiling Heat Transfer from Micro-porous Surfaces written by Je Young Chang and published by . This book was released on 1997 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamic Aspects of Boiling Heat Transfer by : N. Zuber
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:
Book Synopsis Bioinspired Engineering of Thermal Materials by : Tao Deng
Download or read book Bioinspired Engineering of Thermal Materials written by Tao Deng and published by John Wiley & Sons. This book was released on 2018-06-11 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview and summary of recent achievements and the latest trends in bioinspired thermal materials. Following an introduction to different thermal materials and their effective heat transfer to other materials, the text discusses heat detection materials that are inspired by biological systems, such as fire beetles and butterflies. There then follow descriptions of materials with thermal management functionality, including those for evaporation and condensation, heat transfer and thermal insulation materials, as modeled on snake skins, polar bears and fire-resistant trees. A discussion of thermoresponsive materials with thermally switchable surfaces and controllable nanochannels as well as those with high thermal conductivity and piezoelectric sensors is rounded off by a look toward future trends in the bioinspired engineering of thermal materials. Straightforward and well structured, this is an essential reference for newcomers as well as experienced researchers in this exciting field.
Book Synopsis Enhancement of Pool Boiling Heat Transfer Using a Combination of Open Microchannels and Microporous Surfaces by : Chinmay Patil
Download or read book Enhancement of Pool Boiling Heat Transfer Using a Combination of Open Microchannels and Microporous Surfaces written by Chinmay Patil and published by . This book was released on 2014 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Thermal Science and Engineering by :
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.
Book Synopsis Enhancement of Pool Boiling Heat Transfer Using Thermally-conductive Microporous Coating Techniques by : Joo Han Kim
Download or read book Enhancement of Pool Boiling Heat Transfer Using Thermally-conductive Microporous Coating Techniques written by Joo Han Kim and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present research is an experimental study of the enhancement of boiling heat transfer using microporous coating techniques. The current research is divided into four major phases. During the first phase, the effects of different metal particle sizes in the coating compound for thermally non-conductive microporous coating on pool boiling performance of refrigerants and water are investigated. The test surfaces were solid copper blocks with 1-cm2 base at atmospheric pressure in saturated FC-72, R-123, and water. Results showed that the surface treatment by non-conductive microporous coating significantly enhanced both nucleate boiling and critical heat flux of FC-72 and R-123. However, the enhancement of boiling performance for water was merely shown. In the second phase, thermally conductive microporous coatings to enhance boiling performance of water were developed. The first phase motivated efforts to fabricate microporous coatings with conducting binder options. The second phase was stemmed from an effort to combine the advantages of both a mixture batch type (inexpensive & easy process) and sintering/machining method (low thermal resistance of conduction). Two categories of surface treatment processes were considered in the current research. The first can be achieved by a chemical process, Multi-Staged Electroplating (MSE), which uses electricity in a chemical bath to deposit a microporous structure on the surface. The second is a soldering process, Multi-Temperature Soldering Process (MTSP), which binds the metal particles to generate optimum microporous cavities. Scanning Electron Microscope (SEM) and optical microscope images were obtained for thermally conductive microporous coated surfaces. During the third phase, the pool boiling performance of developed MSE and MTSP from second phase was confirmed for water. Results showed that the MSE and MTSP augmented the boiling performance not only for refrigerants but also for water significantly compared to non-conductive microporous coatings. Further investigation for possible future industrial applications of microporous coatings, such as indirect cooling for electronic chips, nanofluids for high power generation industries, and freezing problem of water, were conducted in the final phase.
Book Synopsis Enhancement of Pool Boiling and Evaporative Heat Transfer Using High Temperature Thermally Conductive Microporous Coatings by : Ajay Gurung
Download or read book Enhancement of Pool Boiling and Evaporative Heat Transfer Using High Temperature Thermally Conductive Microporous Coatings written by Ajay Gurung and published by . This book was released on 2015 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present research is an experimental study of the enhancement of pool boiling and evaporative heat transfer using high temperature thermally conductive microporous coatings. Two major types of coatings were investigated: one that is based on copper powders on copper substrate and the other on aluminum powders on aluminum substrate. Both coatings were easy to fabricate with low costs compared to conventional sintering and plasma spraying techniques, yet have high bonding strength and some of them can operate at temperatures up to 670 °C. Multiple coating options were fabricated and tested in pool boiling of water in order to optimize the coating. These coating options consisted of variations of coating composition ratio, coating thickness and powder sizes. Average powder sizes ranged from 5 micron to 110 micron, and coating thicknesses from 75 micron to 340 micron, applied on flat 1x1cm2 test heaters. The heaters were tested in the horizontal, upward-facing orientation in saturated conditions at atmospheric pressure and under increasing heat flux. Pool boiling results revealed an optimum composition, powder size and thickness for each coating types. The maximum enhancement in boiling heat transfer coefficient obtained from copper microporous coatings was up to 8.7 times relative to a plain copper test surface and nearly doubled the critical heat flux while aluminum microporous coatings enhanced boiling heat transfer coefficient by 3.5 times compared to plain aluminum surface without any further enhancement in CHF. This enhancement was ascribed to the numerous microcavities of optimum shape and size formed within the porous matrix of the coating. The detail microstructures of the coatings from the top surface as well as cross-sections are also presented through optical microscope and SEM images. The optimized aluminum coatings were also explored on fluids other than water such as acetone and HFE-7100 for their boiling heat transfer enhancement. Furthermore, the same coatings were applied on evaporative spray and jetimpingement tests using water to broaden the application of aluminum microporous coatings in evaporative cooling technology.
Book Synopsis Handbook of Phase Change by : S.G. Kandlikar
Download or read book Handbook of Phase Change written by S.G. Kandlikar and published by Routledge. This book was released on 2019-01-22 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive coverage of the basic phenomena. It contains twenty-five chapters which cover different aspects of boiling and condensation. First the specific topic or phenomenon is described, followed by a brief survey of previous work, a phenomenological model based on current understanding, and finally a set of recommended design equa
Book Synopsis Principles of Enhanced Heat Transfer by : Ralph L. Webb
Download or read book Principles of Enhanced Heat Transfer written by Ralph L. Webb and published by Wiley-Interscience. This book was released on 1994-03-28 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indeed, today "second generation" enhancement concepts are routing in the automotive and refrigeration industries to obtain lower cost, smaller heat exchanger size, and higher energy efficiency in system operation. And the aerospace, process, and power generation industries are not far behind.
Book Synopsis Heat Transfer and Fluid Flow in Minichannels and Microchannels by : Satish Kandlikar
Download or read book Heat Transfer and Fluid Flow in Minichannels and Microchannels written by Satish Kandlikar and published by Elsevier. This book was released on 2006 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: &Quot;This book explores flow through passages with hydraulic diameters from about 1 [mu]m to 3 mm, covering the range of minichannels and microchannels. Design equations along with solved examples and practice problems are also included to serve the needs of practicing engineers and students in a graduate course."--BOOK JACKET.
Book Synopsis Enhanced Nucleate Boiling by : Javed Arshad
Download or read book Enhanced Nucleate Boiling written by Javed Arshad and published by . This book was released on 1982 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Enhancement of Downward Facing Boiling Heat Transfer Using Micro-Porous Coating by : Faruk Sohag
Download or read book On the Enhancement of Downward Facing Boiling Heat Transfer Using Micro-Porous Coating written by Faruk Sohag and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of in-vessel retention (IVR) by passive external reactor vessel cooling (ERVC) in a flooded cavity during a severe accident has been considered as a viable approach to retain the radioactive core melt within the reactor vessel. The feasibility of IVR-ERVC depends primarily on the critical heat flux (CHF) distribution on the external bottom surface of the reactor vessel. It is now widely recognized that micro-porous coatings can enhance the local CHF limits for downward-facing boiling on the reactor vessel outer surface under IVR-ERVC conditions which in turn enhances reactor safety margins. The existing coating techniques, however, require heat treatment on the vessel wall which is not practical or feasible for commercial-size reactors. In this study, a new and versatile coating technique known as Cold Spray has been used to form a micro-porous coating on a hemispherical test vessel. Steady-state and quenching experiments were performed under simulated IVR-ERVC conditions using a bare vessel and a micro-porous coated vessel of identical dimensions. The downward-facing boiling and CHF phenomena observed in the steady-state and quenching experiments were analyzed qualitatively and quantitatively. Based on the results of visualizations in the quenching experiments, the coated vessel was found to quench much faster than the bare vessel under identical experimental conditions, indicating a higher downward-facing boiling heat transfer (i.e., cooling rate) for the coated vessel. It was also observed that the local rate of boiling and the local CHF limit tended to vary appreciably along the outer surface of the test vessel. Quantitative measurements showed that for all angular locations on the vessel outer surface, the local CHF values for the coated vessel were consistently higher than the corresponding CHF values for the bare vessel. More than 90% enhancement in the local CHF limit was obtained by using micro-porous coatings formed by the Cold Spray technique. Careful inspection of the test vessel confirmed that the micro-porous coating formed by the Cold Spray technique was very durable with its micro-structure unchanged after many cycles of heating and cooling. The Cold Spray process and related equipment are portable, flexible, and scalable, and hence the micro-porous coatings explored in this study can be utilized in new industrial designs, as well as existing reactors provided adequate cavity space is available below the RPV lower head. In addition to the experimental work, a stability analysis of the thin vapor film blanketing the outer surface of the vessel surrounded by ambient liquid was performed to obtain the most dangerous wavelength for breakup of the vapor film. Heat and mass transfer along with the normal and shear stresses at the interface were considered to accurately predict the stability behavior of the vapor film. A film boiling heat transfer model was developed based on the stability analysis. Furthermore, a scaling analysis was performed by utilizing the experimental data obtained in this study to develop a generalized correlation for downward-facing nucleate boiling. The correlation predicts the long-term behavior of reactor pressure vessel under IVR-ERVC conditions.
Book Synopsis Pool Boiling Heat Transfer by : Dong Soo Jung
Download or read book Pool Boiling Heat Transfer written by Dong Soo Jung and published by . This book was released on 1984 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancement of Pool Boiling Heat Transfer by Brazed Aluminum Microporous Coating in Saturated Water by : Juan Carlos Godinez
Download or read book Enhancement of Pool Boiling Heat Transfer by Brazed Aluminum Microporous Coating in Saturated Water written by Juan Carlos Godinez and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface treatment is an effective way to enhance pooling boiling heat transfer. It improves the critical heat flux (CHF) and/or the nucleate boiling heat transfer (NBHT). Surface treatment is developed in this experimental work by adding an aluminum microporous coating onto an aluminum surface. Specifically, a high temperature thermally conductive microporous coating (HTCMC) is developed for an aluminum surface. The coating is manufactured by brazing an aluminum powder onto a plain aluminum surface. The microporous coating enhances the NBHT by creating microscale pores. These pores provide reentrant cavities that enhance boiling. Their properties are controlled by varying the brazing conditions, which are highly dependent on the material properties of the surface, such as the brazing particle size and the brazing environment. Pool boiling tests are conducted on 1x1cm2 aluminum block. They are conducted in saturated distilled water at 1 atm. A parametric experimental study is conducted by varying the thickness and particle size of the HTCMC coating. The averaged particle size used in this study were 11, 24, 66 μm and the coating thickness was varied from 76 to 357 μm. A reference pool boiling curve for the plain aluminum surface is also presented. Here, enhancing pool boiling CHF is accomplished by Boehmite treatment of the bare aluminum surface. An aluminum surface can develop different hydroxides when submerged in distilled water. Under controlled experimental conditions defined in this work, the aluminum surface develops a stable nanoscale Boehmite layer which decreases the static contact angle, from 55° to 12°, and consequently increases the wettability. The Boehmite treated plain aluminum surface has a CHF of 1,850 kW/m2 and a NBHT coefficient of 55.7 kW/m2K. Compared to the plain aluminum surface, the aluminum HTCMC has improvement of more than double in the NBHT coefficient for all the tests conducted in this work. However, the CHF of aluminum HTCMC has no change compared to that of the plain aluminum surface. The study also shows an increase in the NBHT coefficient as the coating thickness of the aluminum HTCMC is increased regardless of particle size. However, after reaching an optimal coating thickness the NBHT coefficient starts to decrease. This optimal coating thickness for a mean particle diameter of 11, 24, 66 μm were 152, 176, 206 μm, respectively. The highest measured NBHT coefficient, 293.5 kW/m2K, was achieved with particle size of 11 μm with a thickness of 152 μm and enhancement of more than five times over the NBHT of Boehmite treated plain aluminum surface.
Book Synopsis Advances in Enhanced Heat Transfer by :
Download or read book Advances in Enhanced Heat Transfer written by and published by . This book was released on 1979 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis VDI Heat Atlas by : VDI Gesellschaft
Download or read book VDI Heat Atlas written by VDI Gesellschaft and published by Springer Science & Business Media. This book was released on 2010-07-21 with total page 1608 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than 50 years, the Springer VDI Heat Atlas has been an indispensable working means for engineers dealing with questions of heat transfer. Featuring 50% more content, this new edition covers most fields of heat transfer in industrial and engineering applications. It presents the interrelationships between basic scientific methods, experimental techniques, model-based analysis and their transfer to technical applications.
