{'fraction_non_alphanumeric': 0.029285099052540915, 'fraction_numerical': 0.014642549526270457, 'mean_word_length': 4.507109004739337, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Heat Transfer Characteristics of Two-Phase Impinged-Jet Flow and Channel Flow

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.