Liquid film thickness in annular flow

An analytical solution relating the mass flow rate to the film thickness and other flow parameters have been developed for the general case of gas—liquid two-phase annular flow in a horizontal pipe line for power-law fluids. The equation developed reduces to the equation derived for the Newtonian fluid when the flow index is equated to unity. In the absence of a detailed knowledge of the flow dynamics, the data were interpreted tentatively in terms of superficial gas—liquid mass flow rate.