Isothermal Pressure Drop for Two-Phase Two-Component Flow in a Horizontal Pipe

The static pressure drop accompanying the isothermal two-phase two-component flow of air and eight various liquids, including benzene, water, and S.A.E. 40 oil, was measured for flow conditions varying from all air to all liquid in a 1-in. glass pipe and a ½-in. galvanized-iron pipe. The flow patterns existing at the various flow rates were studied visually and photographically. A macroscopic analysis of the flow phenomenon is presented, which allows the prediction of two-phase two-component static pressure drop under certain flow conditions. The application of the proposed method to the prediction of pressure drop along a pipe in which a fluid is evaporating is tentatively outlined.