Abstract
Adiabatic experiments were conducted to measure pressure drop for single-phase liquid and gas-liquid two-phase flows through a circular microchannel with an internal diameter of 99.7μm. In order to study the effects of liquid properties on the pressure drop, aqueous solutions of ethanol with four different mass concentrations and distilled water were used as the working liquid, while nitrogen gas was used as the gas phase. For the single-phase flow experiments, the friction factor data were obtained for each working liquid used, and the data agree reasonably with conventional theory. Furthermore, early transition from laminar to turbulent flow was not observed over the present experimental flow conditions. For the two-phase flow experiments, pressure drop data were collected over a wide range of superficial gas and liquid velocities. The present pressure drop data could be well correlated by Lockhart & Martinelli type correlation irrespective of the working liquids tested, if an appropriate constant needed in the correlation is adopted.
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