OS9-08 偏平ミニチャネルにおける流動沸騰に関する研究(OS9 動力エネルギーシステムにおける熱流動)

概要

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The flow and the heat transfer characteristic of the boiling two-phase flow of water were examined. The test flow channel was a 250mm long and 0.5×10mm flat-square passage. The heating section was 50mm long. When the heat flux was low, the heat transfer coefficient agreed well with value calculated with the Dittus-Boelter correlation. The onset condition of boiling was well predicted by the Bergles-Rohsenow correlation. After the boiling was initiated, the heat transfer coefficient increased considerably. The boiling characteristics were close to the Rohsenow saturated-pool boiling correlation. As the heat flux was increased, the flow state varied from the bubbly flow, the slug flow to the annular flow, and finally the critical heat flux condition occurred. Measured two-phase pressure drops were well correlated by the Lockhart-Martinelli method. It was confirmed that the existing knowledge can be extended to the mini-channel of 0.5mm clearance.
2005-06-28