A New Model for CHF in Pool Boiling at Higher Pressure.
نویسندگان
چکیده
منابع مشابه
A Theoretical Model to Predict Pool Boiling CHF Incorporating Effects of Contact Angle and Orientation
A theoretical model is developed to describe the hydrodynamic behavior of the vaporliquid interface of a bubble at the heater surface leading to the initiation of critical heat flux (CHF) condition. The momentum flux resulting from evaporation at the bubble base is identified to be an important parameter. A model based on theoretical considerations is developed for upward-facing surfaces with o...
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Poor understanding of flow boiling in microgravity has recently emerged as a key obstacle to the development of many types of power generation and life support systems intended for space exploration. This study examines flow boiling CHF in microgravity that was achieved in parabolic flight experiments with FC-72 onboard NASA s KC-135 turbojet. At high heat fluxes, bubbles quickly coalesced into...
متن کاملInsight into Mechanicsms and Review of Available Models for Critical Heat Flux (chf) in Pool Boiling
Critical Heat Flux (CHF) has been a subject of interest for boiling equipment designers from design as well safety as viewpoints. Although considerable data exists in literature, a fundamental knowledge of the mechanisms responsible for the CHF phenomenon is needed to develop better predictive methods and efficient enhancement strategies. A critical assessment of the CHF models available in the...
متن کاملOrientation e}ects on pool boiling critical heat ~ux "CHF# and modeling of CHF for near!vertical surfaces
Photographic studies of near!saturated pool boiling at various surface orientations were conducted in order to determine the critical heat ~ux "CHF# trigger mechanism associated with each orientation[ Based on the vapor behavior observed just prior to CHF\ it is shown that surface orientations can be divided into three regions] upward!facing "9Ð 59>#\ near!vertical "59Ð054>#\ and downward!facin...
متن کاملPhotographic study of pool boiling CHF from a downward-facing convex surface☆
Available online 23 April 2008
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ژورنال
عنوان ژورنال: JSME International Journal Series B
سال: 1993
ISSN: 1340-8054,1347-5371
DOI: 10.1299/jsmeb.36.422