Experimental Investigation of Interfacial Shear in Downward, Two-Phase, Annular, CO-Current Flow with Diameter Effects

摘要

An experimental rig has been designed and built to provide two phase annular cocurrent downward flow of air and water in tubes of four different inside diameters, ranging from 1.563 cm - 4.127 cm. Flow rates of the phases and static pressure drop were measured over a range of liquid film Reynolds numbers from 5000 to 26,700, and a range of air Reynolds numbers of 4500 to 21,400. The resulting data for the skin friction coefficient are in qualitative agreement with most previously obtained pertinent data. Various ways of presenting the data are explored and discussed, including the use of superficial, true, and relative gas velocities. The effect of the controlled parameters on the skin friction coefficient is discussed, and the importance of the dependence of skin friction coefficient on tube diameter is emphasized. (ERA citation 09:028137)