日本語フィールド
著者：三島 文也, 有馬 博史，小山 幸平, 岡本 明夫，池上 康之題名：プレート式蒸発器におけるアンモニア強制対流沸騰の可視化発表情報：2011日本冷凍空調学会年次大会講演論文集 ページ: C222キーワード：plate evaporator, ammonia, OTEC, heat transfer coefficient, visualization概要：抄録：This paper presents analysis of boiling heat transfer characteristics of ammonia on plate evaporator obtained from flow visualization. In previous study, we performed visualization experiments and analyzed by still camera images to investigate relationship between void fraction and thermal equilibrium vapor quality. As a result, it was found that the results were in agreement comparatively with drift flux model proposed by Zuber et al. However, the results deflected from this model at low quality region. In this study, visualization experiments using high-speed video camera were conducted to obtain time-averaged void fraction. The local void fraction was calculated by image analysis which process was separation vapor from two-phase image using each frame on movie. Then, the relationship between time-averaged void fraction and thermal equilibrium vapor quality was investigated. This method provides the results which agree with drift flux model which proposed by Zuber et al. at entire range of vapor quality.英語フィールド
Author：Fumiya MISHIMA, Hirofumi ARIMA, Kohei KOYAMA, Akio OKAMOTO, Yasuyuki IKEGAMITitle：Flow Visualization of Forced Convective Boiling of Ammonia on Plate EvaporatorAnnouncement information: Page: C222Keyword：plate evaporator, ammonia, OTEC, heat transfer coefficient, visualizationAn abstract：This paper presents analysis of boiling heat transfer characteristics of ammonia on plate evaporator obtained from flow visualization. In previous study, we performed visualization experiments and analyzed by still camera images to investigate relationship between void fraction and thermal equilibrium vapor quality. As a result, it was found that the results were in agreement comparatively with drift flux model proposed by Zuber et al. However, the results deflected from this model at low quality region. In this study, visualization experiments using high-speed video camera were conducted to obtain time-averaged void fraction. The local void fraction was calculated by image analysis which process was separation vapor from two-phase image using each frame on movie. Then, the relationship between time-averaged void fraction and thermal equilibrium vapor quality was investigated. This method provides the results which agree with drift flux model which proposed by Zuber et al. at entire range of vapor quality.