Evaporative heat and mass transfer from the free surface of a liquid wicked into a bed of spheres |
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| Authors: | Christopher P. Migliaccio Suresh V. Garimella |
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| Affiliation: | 1. Thermal Fluids Laboratory, National Kaohsiung Marine University, No. 142, Hai-Chuan Road, Nan-Tzu District, Kaohsiung 811, Taiwan, ROC;2. Asia Vital Components Co. Ltd., 7F-3, No. 24, Wu-Chuan 2 Rd., Hsin-Chuang City, Taipei 24892, Taiwan, ROC;3. Department of Marine Engineering, National Kaohsiung Marine University, No. 142, Hai-Chuan Road, Nan-Tzu District, Kaohsiung 811, Taiwan, ROC;1. Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, China;2. Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China;3. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, PR China;2. School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, PR China |
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| Abstract: | Evaporation of ethanol from square packed arrays of 3.95 mm diameter copper spheres in a transparent, enclosed chamber is investigated. The enclosure ensures that relatively saturated vapor conditions exist near the free surface. The desired heat flux is imposed on the copper substrate upon which the copper spheres are mounted, and the liquid level in the bed is maintained by wicking from a continuous supply of liquid provided by a syringe pump. Transparent windows in the enclosure allow for visualization of the evaporating liquid meniscus shape, which is recorded for different liquid feeding rates and heat fluxes. Experimentally measured meniscus profiles are compared to analytical results based on surface-energy minimization. A meniscus microregion is defined from the contact line to the length where the liquid thickness reaches 10 μm. An approximate kinetic theory-based analysis estimates that up to ～55% of the total meniscus mass transfer occurs in this microregion. |
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