Abstract
This paper presents the results of an experimental study of the heat transfer during flow boiling of refrigerant R236fa in a horizontal microchannel heat sink. The experiments were performed using closed loop that re-circulates coolant. Microchannel heat exchanger that contains two microchannels with 2x0.4 mm cross-section was used as the test section. The dependence of average heat flux on wall superheat and critical heat flux were measured in the range of mass fluxes from 600 to 1600 kg/m2s and in the range of heat fluxes from 5 to 120 W/cm2. For heat flux greater than 60 W/cm2, nucleate boiling suppression has significant effect on the flow boiling heat transfer, and this leads to decrease of the heat transfer coefficient with heat flux grows.
Highlights
Studies of the processes of heat and mass transfer in microsystems with phase change are fast-developing field of science
The objective of this study is experimentally establishing how the average heat flux correlate with wall superheat during flow boiling of refrigerant R236fa and determining the dependence of critical heat fluxes (CHF) from mass flux in a horizontal microchannel heat sink
The oxygen-free copper block has two micro-channels having cross section 2 mm × 0.4 mm milled with channel-to-channel spacing equals to 2 mm
Summary
Studies of the processes of heat and mass transfer in microsystems with phase change are fast-developing field of science. This is due to the growth of industrial applications, which require the transfer of large heat fluxes in a limited volume, including compact vapor generators/condensers of cryogenic devices and microprocessor cooling systems [1]. The objective of this study is experimentally establishing how the average heat flux correlate with wall superheat during flow boiling of refrigerant R236fa and determining the dependence of critical heat fluxes (CHF) from mass flux in a horizontal microchannel heat sink
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