Experimental Study of Gravity-Controlled Condensation of Binary Vapor Mixtures

二元蒸气混合物重力控制冷凝实验研究

• 批准号: 63460102
• 负责人: FUJII Tetsu
• 金额: $ 4.03万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460102/
• 关键词: Phase change; Gravity controlled condensation; Condensation pattern; Binary vapor mixture; Ethanol+water; Methanol+water; Methanol+Ethanol; Horizontal smooth tube; 膜状凝縮; 滴状凝縮; 二成合混合蒸気; メタノール; エタノール; 水

An experimental study of gravity controlled condensation of binary vapor mixtures of methanol-water, ethanol-water and methanol-ethanol on a smooth horizontal tube was carried out. The condensation of methanol-water mixtures is dropwise in the range chi_<1Gb> = 0.08- 0.85. For ethanol water mixtures there are four condensation patterns observed: the pattern in the range chi_<1Gb> = 0.28 - 0.60 is dropwise, while that In the range chi_<1Gb> = 0.73 - 0.83 changes from streak to filmwise through ringwise as the heat flux density increases and that near azeotrope is filmwise.For methanol-ethanol mixtures the pattern is filmwise. Heat transfer coefficient of the condensate was calculated under the assumption that mass transfer in the vapor layer could be estimated by the present authors' theory for laminar filmwise condensation based on the two phase boundary layer concept. The results for non-filmwise condensation are 2 to 6 times higher than the theoretical values, while those for filmwise condensation are fairly in good agreement.

对甲醇-水、乙醇-水和甲醇-乙醇二元混合蒸汽在水平光滑管上的重力控制冷凝进行了实验研究。甲醇-水混合物的滴状冷凝在<1Gb>0.08- 0.85范围内。对于乙醇-水混合物，观察到四种凝结模式：在chi_<1Gb>= 0.28 - 0.60范围内为滴状，在chi_<1Gb>= 0.73 - 0.83范围内随着热流密度的增加，凝结模式从条纹状到膜状，再到环状，在非共沸物附近为膜状，对于甲醇-乙醇混合物，凝结模式为膜状。在假定汽层内的传质可以用本文作者基于两相边界层概念的层流膜状冷凝理论来估计的情况下，计算了冷凝液的传热系数。非膜状冷凝的计算结果比理论值高2 ~ 6倍，而膜状冷凝的计算结果与理论值相当吻合。

项目成果

T.FUJII,Sh.KOYAMA,N.M.NDIWALANA,and Y.NAKAMURA: "EXPERIMENTAL STUDY OF GRAVITY CONTROLLED CONDENSATION OF BINARY VAPOR MIXTURES ON A SMOOTH HORIZONTAL TUBE" HEAT TRANSFER 1990,Hemisphere Pub.Corp.(tobe published). (1990)

T.FUJII、Sh.KOYAMA、N.M.NDIWALANA 和 Y.NAKAMURA：“平滑水平管上二元蒸气混合物的重力控制冷凝实验研究”HEAT TRANSFER 1990，Hemisphere Pub.Corp.（待出版）。

T. FUJII, Sh. KOYAMA, N. M. NDIWALANA, and Y. NAKAMURA: "EXPERIMENTAL STUDY OF GRAVITY CONTROLLED CONDENSATION OF BINARY VAPOR MIXTURES ON A SMOOTH HORIZONTAL TUBE (to be published)" HEAT TRANSFER 1990, Hemisphere Pub. Corp.

T. FUJII，Sh。

T.FUJII,Sh.KOYAMA,N.M.NDIWALANA,and Y.NAKAMURA: "EXPERIMENTAL STUDY OF GRAVITY CONTROLLED CONDENSATION OF BINARY VAPOR MIXTURES ON A SMOOTH HORIZONTAL TUBE" HEAT TRANSFER 1990,Hemisphere Pub.Corp.(1990)

T.FUJII、Sh.KOYAMA、N.M.NDIWALANA 和 Y.NAKAMURA：“光滑水平管上二元蒸气混合物重力控制冷凝的实验研究”传热 1990，Hemisphere Pub.Corp.（1990）

藤井哲,小山繁,清水洋一,渡部正治,中村芳郎: 日本機械学会論文集(B編). 55ー509. 210-215 (1989)

Satoshi Fujii、Shigeru Koyama、Yoichi Shimizu、Masaharu Watanabe、Yoshiro Nakamura：日本机械工程师学会会议录（B 版）210-215（1989 年）。