Abstract
Smart cooling solutions are required for modern electronic devices as heat flux is continuously
increasing while component size is shrinking day by day. Two phase heat transfer within compact
channels can cope with high heat flux applications. Two phase heat transfer in narrow channels was
the subject of many studies from last decade. The mechanisms involved, however, are not fully clear
and there is still room for further investigations to come up with a general solution. This article
reports experimental finding on flow boiling heat transfer of R134a in a resistively heated, smooth
vertical stainless steel minichannel. Experiments were conducted at 27 & 32 oC saturation
temperature with 100-500 kg/m2
s mass flux and till completion of dryout. The effect of various
parameters like, heat flux, mass flux, vapor quality and system pressure was studied. Results indicated
that heat transfer was strongly controlled by applied heat flux while insignificant effect of varying
mass flux and vapor quality was observed. Experimental findings were compared with various macro
and micro scale correlations from literature, this comparison revealed Gungor and Winterton [10]
correlation as the most accurate one for predicting local heat transfer coefficients.
Zahid Anwar. (2013) Evaporative Heat Transfer with R134a in a Vertical Minichannel, Pakistan Journal of Engineering and Applied Sciences, Volume 13, Issue 1.
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