Abstract
Void fractions and pressure drops were measured on gas-liquid flows in five kinds of narrow flat channels with a width of 10 mm and channel clearances of 0.2 mm ∼ 2.0 mm. Four kinds of water solutions of ethanol were used to examine the influences of surface tension σ and viscosity μ of liquid on flow characteristics. The void fractions increased with a decrease in σ and μ and with a decrease in channel clearance. Under low liquid velocity conditions, the pressure drops were affected by the surface tension, and it was found that Chisholm's equation for the Lockhart-Martinelli correlation could not be applied to channels with relatively large clearances.
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