INFLUENCE OF COMPOSITION ON HEAT TRANSFER AND CRITICAL HEAT FLUX IN BOILING OF MULTICOMPONENT MIXTURES

多组分混合物沸腾时成分对传热和临界热通量的影响

• 批准号: 12650208
• 负责人: FUJITA Yasunobu
• 金额: $ 2.37万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650208/
• 关键词: BOILING HEAT TRANSFER; MIXTURES; CRITICAL HEAT FLUX; COMPOSITION EFFECT; CORRELATION; 熱伝達予測式; 他成分流体; 限界熱流速; ミクロ液膜

(1) Development of Simulation Code for Bubble GrowthA numerical simulation code was developed to analyze the bubble growth and coalescence both for a single nucleation site and for two neighboring sites. Simulation results made clear an importance of evaporation from a meniscus film under bubbles.(2) Influence of Mixture Composition in Flow BoilingFlow boiling experiment was performed for binary refrigerant mixtures (R-134a/R-124) in a horizontal tube. Pressure drop was not influenced by mixture composition, while heat transfer was significantly reduced in mixture boiling. Measured data of pressure drop and heat transfer were correlated in empirical correlations.(3) Influence of Mixture Composition on Three Component MixturesHeat transfer coefficient of ternary refrigerant mixtures (R-134a/R-142b/R-123) was measured in nucleate pool boiling. Reduction in heat transfer coefficients was found attributable to a decrease of the effective temperature difference as a result of the depletion of the more volatile component at the liquid-Vapor interface. Thus the boiling range was considered as a dominant parameter and introduced in a correlation for boiling heat transfer coefficient of mixtures.

(1)汽泡生长模拟程序的开发了一个数值模拟程序，分析了单个成核位置和两个相邻成核位置下汽泡的生长和合并。模拟结果表明了气泡作用下弯月形薄膜蒸发的重要性。(2)混合工质组成对流动沸腾的影响本文对R-134 a/R-124二元混合工质在水平管内进行了流动沸腾实验。混合物的组成对压降没有影响，但在混合物沸腾过程中，传热却显著降低。并对压降和传热的实测数据进行了关联。(3)混合物组成对三元混合物的影响研究在池核沸腾条件下，测定了三元混合制冷剂（R-134 a/R-142 b/R-123）的传热系数。传热系数的减少被认为是由于在液体-蒸汽界面处的更易挥发的组分的耗尽而导致的有效温差的减小。因此，沸程被认为是一个主导参数，并引入到一个关联式的沸腾传热系数的混合物。

项目成果

Y.FUJITA, M.TSUTSUI: "Nucleate Boiling of Multicomponent Mixtures"Proc. of Int. Workshop on Current Status and Future Directions in Boiling Heat Transfer and Two-Phase Flow. 1. 51-58 (2000)

Y.FUJITA，M.TSUTSUI：“多组分混合物的核沸腾”Proc。

Yasunobu FUJITA et al.: "Nucleate Boiling of Multicomponent Mixtures"Proc.of Int.Workshop on Current Status and Future Directions in Boiling Heat Transfer and Two-Phase Flow. 1. 51-58 (2000)

Yasunobu FUJITA 等人：“多组分混合物的核沸腾”Proc.of Int.Workshop 关于沸腾传热和两相流的现状和未来方向。

Y.FUJITA, M.TSUTSUI: "Heat Transfer in Nucleate Boiling of Binary Refrigerant Mixtures"International Journal of Transport Phenomena. 3-4. 365-377 (2001)

Y.FUJITA，M.TSUTSUI：“二元制冷剂混合物核沸腾中的传热”国际传输现象杂志。

Q. BAI, Y. FUJITA: "Numerical Simulation of Bubble Growth in Nucleate Boiling - Effects of System Parameter"Proc. of UEF Conference on Boiling 2000-Phenomena ＆ Emerging Applications. Vol.1. 116-135 (2000)

Q. BAI，Y. FUJITA：“核沸腾中气泡生长的数值模拟 - 系统参数的影响”Proc。2000 年沸腾现象与新兴应用会议，第 1 卷（2000 年）。

Y. FUJITA, M. TSUTSUI: "Experimental Investigation in Pool Boiling Heat Transfer of Ternary Mixture and Heat Transfer Correlation"Proc. of the 5th World Conference on Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics. Vol. 1. 260-355 (2001)

Y. FUJITA，M. TSUTSUI：“三元混合物池沸腾传热的实验研究和传热相关性”Proc。