Experimental Study on Condensation Heat Transfer of Ethanol–Water Vapor Mixtures on Vertical Micro-tubes
| Autor: | Daotong Chong, Jinshi Wang, Junjie Yan, Junchao Qin, Xiping Chen, Ronghai Huang |
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| Rok vydání: | 2015 |
| Předmět: |
Range (particle radiation)
Ethanol Materials science Marangoni effect Vapor pressure Condensation heat transfer Analytical chemistry food and beverages Thermodynamics Condensed Matter Physics complex mixtures chemistry.chemical_compound chemistry Vapor-compression evaporation Mass fraction Water vapor |
| Zdroj: | International Journal of Thermophysics. 36:1598-1617 |
| ISSN: | 1572-9567 0195-928X |
| DOI: | 10.1007/s10765-015-1898-z |
| Popis: | The paper presents an experimental investigation of Marangoni condensation heat transfer of ethanol–water vapor mixtures on vertical micro-tubes with an outer diameter of 0.793 mm, 1.032 mm, and 1.221 mm. Experiments were performed over a wide range of ethanol mass fractions in vapor mixtures for different vapor velocities and pressures. Condensation heat transfer coefficients behaved nonlinear characteristics, increased, and then decreased with increasing vapor-to-surface temperature difference. Under the same experimental conditions, the condensation heat transfer coefficient at a 2 % ethanol mass fraction in vapor was the highest. At low ethanol mass fractions, the condensation heat transfer coefficient of the ethanol–water vapor mixture was 2 to 3 times greater than that for pure steam. The effect of vapor pressure and velocity on condensation heat transfer suggested a positive tendency on each micro-tube for all vapor mixtures with different ethanol mass fraction. Results showed that condensation heat transfer coefficients on micro-tubes with a diameter of 1.032 mm were higher than those on the other two micro-tubes, suggesting that there existed a critical diameter which gave the largest condensation heat transfer coefficient. |
| Databáze: | OpenAIRE |
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