An Experimental Investigation of Saturated Flow Boiling Characteristics in Square Microchannels
Journal Title: Endüstri Mühendisliği - Year 2019, Vol 60, Issue 694
Abstract
In this study, saturated flow boiling characteristics of deionized water are experimentally investigated in silicon heat sink consisting of twenty nine parallel microchannels with cross sectional dimensions of 200 µm x 200 µm (width x height). Experiments are conducted for three different mass fluxes of 51, 65 and 78 kgm-2s-1, while the wall heat flux ranges from 44.5 – 62.8 kWm-2. In this context, the effects of heat flux and mass flux on the two phase heat transfer coefficient and the total pressure drop are investigated. The physical mechanism is scrutinized through simultaneous high speed flow images taken during measurements. Consequently, two phase heat transfer coefficient decreases with increasing heat flux and vapor quality, and increases with increasing mass flux. The total pressure drop increases with increasing heat flux and exit vapor quality while it decreases with increasing mass flux. From the flow visualization experiments, it is observed that flow boiling phenomenon in microchannels has quasi-periodical characteristics.
Authors and Affiliations
Burak Markal, Orhan Aydın, Mete Avcı
Keywords
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