Prediction of Critical Heat Flux for Flow Boiling in Subcooled and Saturated Regimes
Author: Zhijian Deng
Publisher:
Published: 1998
Total Pages: 582
ISBN-13:
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Author: Zhijian Deng
Publisher:
Published: 1998
Total Pages: 582
ISBN-13:
DOWNLOAD EBOOKAuthor: Sujoy Kumar Saha
Publisher: Springer
Published: 2015-06-04
Total Pages: 62
ISBN-13: 3319177354
DOWNLOAD EBOOKThis Brief concerns the important problem of critical heat flux in flow boiling in microchannels. A companion edition in the SpringerBrief Subseries on Thermal Engineering and Applied Science to “Heat Transfer and Pressure Drop in Flow Boiling in Microchannels,” by the same author team, this volume is idea for professionals, researchers, and graduate students concerned with electronic cooling.
Author: Jean-Marie Le Corre
Publisher:
Published: 2007
Total Pages: 282
ISBN-13:
DOWNLOAD EBOOKThermal performance of heat flux controlled boiling heat exchangers are usually limited by the Critical Heat Flux (CHF) above which the heat transfer degrades quickly, possibly leading to heater overheating and destruction.
Author: Abhay Ashok Watwe
Publisher:
Published: 1996
Total Pages: 504
ISBN-13:
DOWNLOAD EBOOKAuthor: R. J. Weatherhead
Publisher:
Published: 1963
Total Pages: 40
ISBN-13:
DOWNLOAD EBOOKExperimental data obtained at CISE on two-phase adiabatic flow are presented. The measured quantities are pressure drop and liquid film thickness on the inner and the outer wall of the conduit. The pressure loss and film flow rate are evaluated. The experimental data are discussed and the effects of various physical and geometrical parameters are investigated. A simple relation for the pressure loss in adiabatic dispersed regime is given.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Published: 2018-06-15
Total Pages: 124
ISBN-13: 9781721131327
DOWNLOAD EBOOKExperiments were performed to examine the effects of body force on flow boiling critical heat flux (CHF). FC-72 was boiled along one wall of a transparent rectangular flow channel that permitted photographic study of the vapor-liquid interface just prior to CHF. High-speed video imaging techniques were used to identify dominant CHF mechanisms corresponding to different flow orientations and liquid velocities. Six different CHF regimes were identified: Wavy Vapor Layer, Pool Boiling, Stratification, Vapor Counterflow, Vapor Stagnation, and Separated Concurrent Vapor Flow. CHF showed significant sensitivity to orientation for flow velocities below 0.2 m/s, where extremely low CHF values where measured, especially with downward-facing heated wall and downflow orientations. High flow velocities dampened the effects of orientation considerably. The CHF data were used to assess the suitability of previous CHF models and correlations. It is shown the Interfacial Lift-off Model is very effective at predicting CHF for high velocities at all orientations. The flooding limit, on the other hand, is useful at estimating CHF at low velocities and for downflow orientations. A new method consisting of three dimensionless criteria is developed for determining the minimum flow velocity required to overcome body force effects on near-saturated flow boiling CHF. Vertical upflow boiling experiments were performed in pursuit of identifying the trigger mechanism for subcooled flow boiling CHF. While virtually all prior studies on flow boiling CHF concern the prediction or measurement of conditions that lead to CHF, this study was focused on events that take place during the CHF transient. High-speed video imaging and photomicrographic techniques were used to record the transient behavior of interfacial features from the last steady-state power level before CHF until the moment of power cut-off following CHF. The video records show the development of a wavy vapor layer which propagates alo
Author: S. Mostafa Ghiaasiaan
Publisher: Cambridge University Press
Published: 2017-01-11
Total Pages: 1322
ISBN-13: 1316785300
DOWNLOAD EBOOKProviding a comprehensive introduction to the fundamentals and applications of flow and heat transfer in conventional and miniature systems, this fully enhanced and updated edition covers all the topics essential for graduate courses on two-phase flow, boiling, and condensation. Beginning with a concise review of single-phase flow fundamentals and interfacial phenomena, detailed and clear discussion is provided on a range of topics, including two-phase hydrodynamics and flow regimes, mathematical modeling of gas-liquid two-phase flows, pool and flow boiling, flow and boiling in mini and microchannels, external and internal-flow condensation with and without noncondensables, condensation in small flow passages, and two-phase choked flow. Numerous solved examples and end-of-chapter problems that include many common design problems likely to be encountered by students, make this an essential text for graduate students. With up-to-date detail on the most recent research trends and practical applications, it is also an ideal reference for professionals and researchers in mechanical, nuclear, and chemical engineering.
Author: Ra-Min Tain
Publisher:
Published: 1990
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKA semi-empirical model to predict the Critical Heat Flux (CHF) in cross-flow boiling is presented in this work. This model, using an empirical correlation to calculate the vapor sheet thickness, is able to predict the CHF in subcooled or saturated region. The empirical correlation presented by Ungar and Eichhorn (1988) to calculate the vapor sheet thickness is modified by this work to include the quality effect. The RMS error for this semi-empirical correlation against the 271 experimental data obtained from various investigations is around 22%.
Author: Susan Rebecca Breon
Publisher:
Published: 1986
Total Pages: 484
ISBN-13:
DOWNLOAD EBOOKAuthor: VDI Gesellschaft
Publisher: Springer Science & Business Media
Published: 2010-07-21
Total Pages: 1608
ISBN-13: 3540778764
DOWNLOAD EBOOKFor 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.