Abstract
The paper discusses the stratified flow of liquid and gas in a circular pipe under the condition that the two components do not react with each other. If mass flow occurs across the interphase the influence of the entrainment of liquid droplets into the gas or the redeposition of them on the walls or on the interphase is accounted for by a lump parameter expressing the integrated effect of this phenomenon. The inclusion of this feature of the flow is shown to have a dramatic effect on the normal depth of the liquid phase under given conditions. Explicit analytical equations for the pressure drop and conditions determining the shape of the interphase including possible ‘hydraulic jumps’ are given. A special feature of the approach is the way in which the variation of the pressure in the liquid phase due to gravity is accounted for. The results in the paper may be used as a basis for experimental evaluation of the integrated shear stress at the interphase.
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