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Pre- and Post-Critical Heat Flux Analyses in a Saturated Refrigerant Flow Boiling System

Author(s)
Zhang, TieJun; Catano, Juan; Jensen, Michael K.; Wang, Evelyn
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Abstract
Vapor compression refrigeration (VCR) cooling has been identified as a promising solution to ensure the low-Temperature sustainable operation of photonics, avionics and electronics in extreme hot weather. With the inherent benefits of saturated flow boiling in a direct VCR cooling cycle, uniform low surface temperature and low solid/liquid thermal resistances can be achieved. However, flow boiling heat transfer performance is limited by the relatively low critical heat flux (CHF) condition because the evaporator inlet flow is already a liquid/vapor mixture. Moreover, for the aforementioned applications, the dissipated heat loads are usually subject to large and transient changes, which could easily cause the evaporating flow to exceed the CHF point. Therefore, it is important to characterize boiling heat transfer in transient VCR evaporators under both pre-CHF and post-CHF conditions. Comprehensive experimental data are reported in this paper to describe the complete forced convection boiling hysteresis at the evaporator exit. Several wellknown boiling heat transfer correlations and flow pattern criteria are used to help understand the physics of the hysteresis. An empirical model is developed to reveal the unstable nature of transition flow boiling dynamics. A probability distribution function model is further proposed to predict the droplet size in mist flow and vapor core of annular flow. This study provides more design and operating guidelines for the application of saturated flow boiling systems in renewable power generation and electronics/ photonics/avionics cooling industries. Topics: Flow (Dynamics), Boiling, Refrigerants, Heat flux
Date issued
2012-11
URI
http://hdl.handle.net/1721.1/120129
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
ASME 2012 International Mechanical Engineering Congress and Exposition
Publisher
ASME International
Citation
Zhang, TieJun, Juan Catano, Evelyn N. Wang, and Michael K. Jensen. “Pre- and Post-Critical Heat Flux Analyses in a Saturated Refrigerant Flow Boiling System.” ASME 2012 International Mechanical Engineering Congress and Exposition, 9-15 November, 2012, Houston, Texas, ASME, 2012. © 2012 by ASME
Version: Final published version
ISBN
978-0-7918-4523-3

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