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Author : Boštjan Zajec
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)
Download or read book Experimental Investigation of Flow Boiling at High Heat Flux Conditions written by Boštjan Zajec and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dominic T. Peters
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.:/5 (419 download)
Download or read book An Experimental Investigation of the Flow Boiling Heat Transfer and Critical Heat Flux in a Vertically Oriented Heated Tube written by Dominic T. Peters and published by . This book was released on 1999 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies the heat transfer characteristics of flow boiling in a circular tube. Emphasis is placed on steady state subcooled flow boiling at high fluxes and CHF. Transient studies in film boiling are also carried out to simulate quenching or emergency cooling situations. This has been achieved by both a literature review and by establishing an experimental test stand to gather data. Recommendations are made for further research based on the results of the present work.
Author : VDI Gesellschaft
Publisher : Springer Science & Business Media
ISBN 13 : 3540778764
Total Pages : 1608 pages
Book Rating : 4.5/5 (47 download)
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.
Author : Vernon Emerson Holt
Publisher :
ISBN 13 :
Total Pages : 122 pages
Book Rating : 4.3/5 (91 download)
Download or read book An Experimental Investigation of High-flux Free Convection Heat Transfer to Water Up to Near-critical Conditions written by Vernon Emerson Holt and published by . This book was released on 1961 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary purpose of this investigation was to increase the basic knowledge of nucleate and film boiling heat transfer to fluids up to their critical pressures.
Author : Bren Andrew Phillips
Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (895 download)
Download or read book Experimental Investigation of Subcooled Flow Boiling Using Synchronized High Speed Video, Infrared Thermography, and Particle Image Velocimetry written by Bren Andrew Phillips and published by . This book was released on 2014 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Subcooled flow boiling of water was experimentally investigated using high-speed video (HSV), infrared (IR) thermography, and particle image velocimetry (PIV) to generate a unique database of synchronized data. HSV allowed measurement of the bubble departure diameter. IR thermography allowed measurement of wall superheat (local distribution and surface-averaged values), heat transfer coefficient, nucleation site density, and bubble frequency. Particle image velocimetry allowed for the measurement of velocity profiles in the liquid phase for single bubble nucleation events. The tests were performed at pressures of 1.05, 1.5, and 2.0 bar and at subcoolings of 5, 10, and 15 °C. The mass flux values explored were 150-1250 kg/m2/s. The heat flux values explored were 100-1600 kW/m2. As expected, the heat transfer coefficients increased with increasing mass flux in the single-phase convection and partial boiling regions, and converged to a fully-developed boiling curve for high heat fluxes. The bubble departure diameter decreased with increasing mass flux and decreasing heat flux; in accordance with Sugrue's model. The nucleation site density increased with increasing superheat and decreasing mass flux, as predicted by Kocamustafaogullari and Ishii's model. The nucleation site density models under-predicted the nucleation site density for a given wall superheat. Wait time and frequency models did not reproduce the data accurately, and underestimated wait time by an order of magnitude. A new mechanistic model for calculating the wait time was developed that split the wall heat flux into the component that is transferred to the fluid, and the component that is transferred as sensible heat into the heater wall. Significant localized cooling was observed underneath bubbles sliding along the wall after departure from a nucleation site, an effect which should be considered in advanced models of subcooled flow boiling. The sliding bubble thermal effects were found to be insensitive to system conditions and were limited by the thermal conduction within the substrate. Bubble growth front velocities, and regions of flow influence of departing bubbles were measured with PIV. The database generated in this project can be used to inspire or validate mechanistic models and/or CFD simulations of subcooled flow boiling heat transfer.
Author : Jason Scott Bower
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (544 download)
Download or read book Experimental Investigation of Gravity-independent Flow Boiling Regimes written by Jason Scott Bower and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Heat transfer coefficients have been investigated and it appears that a consequence of gravity independence of ebullition phenomena is a corresponding gravity independent thermal transport two-phase flow-boiling regime. The dependent/independent regime map constructed from experimental data suggests that the analytical bubble dynamics model prescribes a conservative design criterion for the gravity-independent regime. The problem of heat exchanger component burnout has been addressed in the study by measuring the critical heat flux at differing orientations relative to gravity. The data exhibit a strong influence of orientation and suggest that flow orientations without sufficient means to sweep and lift vapor away from the heat transfer surface are subject to considerably lower critical heat fluxes. However, at high velocities, the differences among flow orientations are sharply reduced, suggesting there exists a high velocity region where the critical heat flux is gravity-independent.
Author : W. H. Jens
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (319 download)
Download or read book Analysis of Heat Transfer, Burnout, Pressure Drop and Density Data for High-pressure Water written by W. H. Jens and published by . This book was released on 1955 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dieter K. Huzel
Publisher : AIAA
ISBN 13 : 9781600864001
Total Pages : 452 pages
Book Rating : 4.8/5 (64 download)
Download or read book Modern Engineering for Design of Liquid-Propellant Rocket Engines written by Dieter K. Huzel and published by AIAA. This book was released on 1992 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Qian You
Publisher :
ISBN 13 :
Total Pages : 111 pages
Book Rating : 4.:/5 (111 download)
Download or read book Experimental Investigation of Flow Boiling Instability in a Single Vertical Microtube written by Qian You and published by . This book was released on 2015 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow boiling in a microchannel heat sink is considered as a suitable and an efficient method to dissipate high heat flux from a small surface. Especially, this technique can achieve uniform axial temperature distribution and low noise with a little coolant and low pumping power consumption. However, the main drawback of this attractive technique is flow instability which is induced by the flow phase change. Flow instability can constrain the advantages of flow boiling heat transfer, or even damages systems. In this thesis, the fundamental investigations on the flow instability in a single vertical microtube are conducted. The objectives are to understand the flow oscillations types and features in vertical flow directions, the effects of geometric factors (hydraulic diameter of microtube and flow orientation) and operating conditions (mass flux and heat flux) on flow instability behaviors, and to investigate the inlet orifice for controlling flow instability in vertical flow directions. Three different sizes of stainless steel microtubes with 0.305, 0.533 and 0.889 mm hydraulic diameters are tested. The working fluid FC-72 maintains around 24 °C at the inlet of microtube. The mass flux varies from 700 to 1600 kg/m2•s, and the heat flux is applied on the tube surface uniformly up to 9.6 W/cm2. For the flow instability controlling study, two sizes of inlet orifices (50% and 20% area ratio) are investigated, respectively. The experimental results show that in a large hydraulic diameter, the onset of flow instability with obvious and sustained oscillation features is usually observed, and it can be delayed by large mass fluxes. In a small hydraulic diameter, the transient point is most detected and occurs earlier than in large size microtubes at a given mass flux, and the mass flux effect on its occurrence can be ignored. The buoyancy force impacts the flow instability appearance and characteristics. The irreversible flow blockage is observed in the smallest tube in downward flow direction and not sensitive to the mass flux. With more heat flux applied on the largest tube, the flow oscillations change to intensive in upward flow direction, but tend to be re-stabilized in downward flow direction. The 50% inlet orifice shows better performance at large mass fluxes or in upward flow direction. The 20% inlet orifice has a good ability to eliminate flow instability in the current investigation, but it induces higher pressure drop than 50% inlet orifice.
Author : John W. Schaefer
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (31 download)
Download or read book Investigation of Forced-convection Nucleate Boiling of Water for Nozzle Cooling at Very High Heat Fluxes written by John W. Schaefer and published by . This book was released on 1962 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John G. Collier
Publisher : Clarendon Press
ISBN 13 : 0191591262
Total Pages : 646 pages
Book Rating : 4.1/5 (915 download)
Download or read book Convective Boiling and Condensation written by John G. Collier and published by Clarendon Press. This book was released on 1994-05-19 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Third edition of a well-known and well established text both in industry and for teaching * Fully up-to-date and includes extra problems This book is an aid to heat exchanger design written primarily for design and development engineers in the chemical process, power generation, and refrigeration industries. It provides a comprehensive reference on two-phase flows, boiling, and condensation. The text covers all the latest advances like flows over tube bundles and two-phase heat transfer regarding refrigerants and petrochemicals. Another feature of this third edition is many new problems at chapter ends to enhance its use as a teaching text for graduate and post-graduate courses on two-phase flow and heat transfer. - ;This book is written for practising engineers as a comprehensive reference on two-phase flows, boiling, and condensation. It deals with methods for estimating two-phase flow pressure drops and heat transfer rates. It is a well-known reference book in its third edition and is also used as a text for advanced university courses. Both authors write from practical experience as both are professional engineers. -
Author :
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (227 download)
Download or read book A High Heat Flux Flow Boiling Apparatus for the Study of Cooling Effectiveness written by and published by . This book was released on 1995 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Backside water cooling is used extensively to transfer heat from critical elements in high heat flux devices such as hypersonic test facilities and nuclear reactors. In such devices, efficient cooling is accomplished with high heat transfer coefficients resulting from the transition of the coolant from single phase convection to nucleate boiling at higher heat flux. Analytical modeling of the heat-transfer mechanisms for the design of complex configurations becomes difficult in the boiling regime, especially at the critical heat flux (CHF) condition. Experimental investigation of the cooling process can provide the means to study the heat-transfer mechanisms, evaluate parametric trends, and develop working correlations for the cooling configuration of interest. A flow boiling apparatus, called the High Temperature Wall Laboratory (HTWL), has been developed at the USAF/Arnold Engineering Development Center (AEDC) to perform experimental investigation of the cooling processes encountered in high-pressure, electric arc heater facilities. A summary of the development and operation of the apparatus and a discussion of initial experimental work using the apparatus are contained in this report. jg p4.
Author : James R. Stone
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (31 download)
Download or read book An Experimental Investigation of Pressure Drop and Heat Transfer for Water Boiling in a Vertical-upflow Single-tube Heat Exchanger written by James R. Stone and published by . This book was released on 1967 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Butterworth
Publisher :
ISBN 13 : 9780198517184
Total Pages : 514 pages
Book Rating : 4.5/5 (171 download)
Download or read book Two-phase Flow and Heat Transfer written by David Butterworth and published by . This book was released on 1979 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Satish Kandlikar
Publisher : Elsevier
ISBN 13 : 9780080445274
Total Pages : 492 pages
Book Rating : 4.4/5 (452 download)
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.
Author : Andrew Jonathan Richenderfer
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (15 download)
Download or read book Experimental Study of Heat Flux Partitioning in Pressurized Subcooled Flow Boiling written by Andrew Jonathan Richenderfer and published by . This book was released on 2018 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding of subcooled flow boiling and the critical heat flux (CHF) is of the utmost importance for both safety and profitability of pressurized water nuclear reactors since they are major factors in the determination of the reactor power rating. Motivated by the emergence of a new wall boiling model by Gilman [3] and previous experimental insights from Phillips [12], a first-of-a-kind experimental investigation of pressurized steady-state subcooled flow boiling was conducted using state-ofthe- art diagnostics to gain a unique insight of the relevant mechanisms, including the partitioning of the wall heat flux. Conditions up to 10 bar pressure, 2000 kg/m2s mass flux and 20 K subcooling were explored. High-speed infrared thermometry tools were developed and used to measure the local time-dependent 2-D temperature and heat flux distributions on the boiling surface. These distributions were analyzed to determine fundamental boiling heat transfer parameters such as the nucleation site density, growth and wait times, nucleation frequency, departure diameter as well as the partitioning of the wall heat flux. While established mechanistic models can capture the trends of growth time and wait time with relatively good accuracy, this work reveals current models do not accurately predict the activation and interaction of nucleation sites on the boiling surface. This is a major roadblock, since boiling curves and CHF values obtained in nominally identical environments can be significantly different depending upon the nucleation site density which in turn is determined by the surface properties. The role of evaporation in the partitioning of the heat flux increases monotonically as the average heat flux increases, up to a maximum value of 70%, and is the dominant mechanism at high heat fluxes. At low and intermediate heat fluxes single-phase heat transfer is the dominant mechanism. Traditional heat partitioning models fail to capture these physics, but newer models with a comprehensive and physically consistent framework show promise in predicting the wall heat transfer. The data and understanding produced by this work will be essential for the development and validation of these modeling tools.
Author : S. M. Sohel Murshed
Publisher : BoD – Books on Demand
ISBN 13 : 9535124056
Total Pages : 184 pages
Book Rating : 4.5/5 (351 download)
Download or read book Electronics Cooling written by S. M. Sohel Murshed and published by BoD – Books on Demand. This book was released on 2016-06-15 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Featuring contributions from the renowned researchers and academicians in the field, this book covers key conventional and emerging cooling techniques and coolants for electronics cooling. It includes following thematic topics: - Cooling approaches and coolants - Boiling and phase change-based technologies - Heat pipes-based cooling - Microchannels cooling systems - Heat loop cooling technology - Nanofluids as coolants - Theoretical development for the junction temperature of package chips. This book is intended to be a reference source and guide to researchers, engineers, postgraduate students, and academicians in the fields of thermal management and cooling technologies as well as for people in the electronics and semiconductors industries.
