This article provides a combined theoretical and experimental investigation into predicting hold-up in stratified two-phase flow in a horizontal pipe. The test section, 3 m long, with an inside diameter of 30 mm was made of plexiglass to permit visual observation of the flow patterns. The experiments were carried out under various air and water flowrates in the stratified flow pattern. The liquid hold-up was measured by isolating the test section with two quick-closing valves. In the theoretical study, the Hamersma–Hart friction factor correlation1 was reformulated and incorporated to the Wongwises model2 to improve the prediction accuracy of horizontal stratified two-phase flo
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