蒸気インジェクタ開発を目指した静止液中蒸気泡凝縮熱伝達に関する研究(NP2 軽水炉の設計・建設技術)

概要

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The application of a steam injector to nuclear rectors as a water supply pump and a low pressure injection pump has been investigated. The heat transfer coefficient of the direct condensation of steam on the sub-cooled water surface which is indispensably required in designing and analytically examining the steam injector was studied in this research. A steam bubble was formed by ejecting steam from a 1mm diameter nozzle into sub-cooled stagnant water at atmospheric pressure. The measured heat transfer coefficient defined by temperature difference between the saturation temperature and liquid temperature and a time-averaged bubble surface area was much lower, approximately 1/100, than the realistic condensation heat transfer coefficient of steam. The measured value increased as the water sub-cooling increased on the contrary to that the realistic condensation heat transfer coefficient showed decreasing tendency with the sub-cooling increase. It was considered that when the steam bubble condensed in stagnant water, heat conduction in water provided large thermal resistance for the condensation.
一般社団法人日本機械学会の論文
2004-06-22