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Experimental investigation of flow boiling in vertical microchannels

Shuai J., Kulenovic R., Mertz R., Groll M.

Archives of Thermodynamics

2002

Vol. 23, no 4

39-48

Flow boiling heat transfer in micro-scale vertical channels is attracting increasing attention with the progressing miniaturization in many industrial fields, e.g. electronics, chemical engineering, etc. Experiments have been conducted to investigate the heat transfer and flow boiling phenomena in microchannels (rectangular channels with 2 mm x 4 mm and 0.5 mm x 2.0 mm (width x height). The working fluid is deionized water. The flow rate is 200--700 kg/(m'2s) at atmospheric pressure. With the aid of video camera, flow boiling phenomena are observed as well. Three flow patterns, i.e. bubbly flow, slug flow and annular flow, could be distinguished. Features of pressure drop fluctuations between the inlet and outlet of the test section are also presented.