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-乙醇二元蒸气混合物在光滑水平管上的重力控制冷凝进行了实验研究。甲醇-水混合物的冷凝在chi_<1Gb>＝0.08-0.85的范围内逐滴进行。对于乙醇水混合物，观察到四种冷凝模式：在 chi_<1Gb> = 0.28 - 0.60 范围内的模式为滴状，而在 chi_<1Gb> = 0.73 - 0.83 范围内，随着热量的增加，从条纹状变为膜状直至环状。通量密度增加，并且接近共沸物时是膜状的。对于甲醇-乙醇混合物，图案是膜状的。冷凝物的传热系数是在假设蒸汽层中的传质可以通过本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的。非膜状冷凝的结果比理论值高2至6倍，而膜状冷凝的结果相当吻合。

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）。