Abstract
In the present study, the lateral heat transfer and fluid flow characteristics between two-phase impinged-jet flow and two-phase channel flow were compared. The effects of volumetric quality (0 − 0.9) on the lateral variation of the Nusselt number were considered. The working fluids are air and water. A circular jet of 470 mm long with a 5.86 mm inner diameter is used. The water jet Reynolds number of 3030 is obtained. The results show that the lateral Nusselt number of the two-phase channel flow is 30 − 40% higher than that of the two-phase impinged-jet flow in the bubble-impact region due to the movement of high-velocity bubbles. Additionally, from the flow visualization, most of the bubbles are observed in the two-phase channel flow and increase the lateral Nusselt number in the bubble-impact region, while most of the bubbles are burst and escaped to the environment air in the jet-impact region and few bubbles float on the hydraulic jump in the two-phase impinged-jet flow, which neither touch the heating surface nor enhance the heat transfer enhancement.
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