Abstract
This work presents a simple yet accurate model for two-phase flow that is easily incorporated in a heat transfer model. The fluid flow model uses a single expression for liquid holdup, with flow-pattern-dependent values for flow parameter and rise velocity. To avoid abrupt changes in gradients at flow pattern boundaries, we use an empirically determined exponential function for smooth transition of parameter values between flow patterns. Frictional and kinetic heads, whose contribution to total pressure loss are small, are estimated using the homogeneous model.
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