Abstract
Effect of surface wettability on pressure drop has been studied using duct walls with different contact angle. The contact angles of duct walls are 0°, 30°, 110°and 150°. Experiments were carried out to measure the pressure drop and the flow-rate by using a manometer and a flow meter. In single-phase flow, the coefficients of friction in all cases were nearly the same. In two-phase flow, friction drag increased for walls of contact angles of 30°and 110°due to the deposition of bubbles on the wall.
