Distribution of Sliding Bubble Diameter along Axial Direction in Narrow Rectangular Channel

A visual study on forced convection subcooled water boiling experiments was conducted.A high speed camera was used to capture the distribution of sliding bubble diameter along axial direction in the narrow rectangular channel.The consecutive images of sliding bubbles coalescence were captured.Bubble diameter distribution on axial direction of 300,400 and 500 mm was achieved.The results show that the in-creasing of the axial direction causes the increasing of the sliding bubble diameter.The growth of sliding bubble along heating surface,the coalescence of bubbles between slipping bubble and the wall-attached bub-ble,and the coalescence of slipping bubbles are the main reason.