Two-phase pressure drop due to friction in micro-channel

作者：Lim Tae Woo; You Sam Sang^*; Kim Jong Su; Moon Serng Bae; Seo Dong Hoan

来源：Proceedings of the Institution of Mechanical Engineers - Part C: Journal of Mechanical Engineering Science , 2014, 228(5): 921-931.

DOI：10.1177/0954406213492266

• Frictional pressure drop
• micro-channel
• Reynolds number
• two-phase
• Weber number

dThis paper deals with an experimental investigation to measure the frictional pressure drops for two-phase flow boiling in a micro-channel with a hydraulic diameter of 500 mu m. First, the experimental study is performed under the test conditions: heat fluxes ranging from 100 to 400 kW/m(2), vapor qualities from 0 to 0.2, and mass fluxes of 200, 400 and 600 kg/m(2)s. Then, the frictional pressure drop during flow boiling is estimated using two models: the homogeneous model and the separated flow model. The experimental results show that the two-phase multiplier decreases with the increase of mass flux. In addition, the measured pressure drops are compared with those from a few correlation models available for macro-scales and mini/micro-scales. Finally, the present paper proposes a new correlation for two-phase frictional pressure drops in mini/micro-scales. This correlation model is developed based on the Chisholm constant C as a function of two-phase Reynolds and Weber numbers. It is found that the new correlation satisfactorily predicts the experimental data within mean absolute error (MAE) of 3.9%.

• 出版日期2014-4