Abstract
A solution to the momentum and continuity equations in stratified and annular two-phase laminar flow is presented for the cases of parallel plates, round and elliptical tubes. The velocity distribution, mean velocity, void fraction and pressure drop are evaluated in each geometry. It is shown that the pressure drop in elliptical tubes with the main axis of the ellipse in a vertical position is smaller than in a horizontal position. In general, the pressure drop is lower when the channel geometry is such that the contact area between the phases is smaller. The effect of liquid viscosity upon the pressure drop is stronger for low flow quality and decreases rapidly with an increase of the gas flow rate.
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