Bhide, R R and Singh, Shiv Govind and Duryodhan, V S and Sridharan, A and Agrawal, A
(2015)
Onset of Nucleate Boiling and Critical Heat Flux with Boiling Water in Microchannels.
International Journal of Microscale and Nanoscale Thermal, 4 (1).
pp. 25-47.
ISSN 1949-4955
Abstract
This paper focuses on experimental determination of onset of nucleate boiling
(ONB) and critical heat flux (CHF) at the microscales, and comparison of these with
available correlations. The working fluid is deionised water and microchannel of four
different hydraulic diameters: 65, 70, 107 and 125 m, have been tested. Effect of
hydraulic diameter (65-125 m), mass flux (60-1410 kg/m2s) and heat flux (0-910
kW/m2) on ONB and CHF has been studied in detail. The heat flux for onset of nucleate
boiling increases with hydraulic diameter and mass flux. The critical heat flux tends to
increase with a decrease in hydraulic diameter and with increasing mass flux. The effect
of surface roughness on CHF has also been tested to a limited extent; no clear change in
the CHF value was observed upon changing the surface roughness by an order of
magnitude. The empirical correlations tested in this study predict the experimental data to
varying extent. These results may help better determine the lower and upper limits of heat
flux while designing heat sink for electronic cooling.
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