抄録
To provide insight into the mechanism of heat and momentum transport during nucleate pool boiling of a fluid on a holizontal heating surface, flow visualization experiment was conducted to determine fluid motion around an air bubble. Nuclate boiling was simulated by injecting air through an orifice in the bottom surface of an acrylic tank filled with glycerin. For the visualization of flow, tracer particles were suspended in the fluid. Two images at a constant time interval were digitized and stored in an image memory. Comparison of these images were then made by the cross-correlation method and the velocity vectors were determined. The results show a radial flow during the stage of bubble growth, a radial flow and a fluid motion approaching below the bubble during the stage of bubble detachment, and a suction flow underneath the rising bubble in addition to those types of flow during the stage of bubble rise through the fluid.
