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Measurements of critical heat flux and liquid-vapor structure near the heating surface in pool boiling of 2-propanol/water mixtures

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タイトル: Measurements of critical heat flux and liquid-vapor structure near the heating surface in pool boiling of 2-propanol/water mixtures
著者: Sakashita, Hiroto 著作を一覧する
Ono, Ayako 著作を一覧する
Nakabayashi, Yuta 著作を一覧する
キーワード: Critical heat flux
Binary mixtures
Pool boiling
Conductance probe
Macrolayer
発行日: 2010年 3月
出版者: Elsevier
誌名: International Journal of Heat and Mass Transfer
巻: 53
号: 7-8
開始ページ: 1554
終了ページ: 1562
出版社 DOI: 10.1016/j.ijheatmasstransfer.2009.11.028
抄録: Saturated pool boiling of 2-propanol/water mixtures on a 12 mm diameter horizontal disk under atmospheric pressure was investigated. The CHF of the mixtures increased up to 1.7 times the CHF of water at 3.0-4.7 mol% concentrations of 2-propanol. To examine the mechanism of the CHF enhancement in the mixtures, liquid-vapor structures close to the heating surface were measured using a conductance probe. It was found that in the boiling of the mixtures, liquid-vapor structures show strong non-uniformity in the radial direction of the heating surface. The void fractions at 0.1mm to 1mm above the heating surface are small at the central region and large near the periphery of the heating surface. The liquid layer between the vapor mass and the heating surface is considerably thicker than that of water at the central region and becomes thinner near the periphery of the heating surface. This thicker liquid layer is likely to be the cause of the CHF enhancement in the 2-propanol/water mixtures.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/42767
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 坂下 弘人

 

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