Effects of superheat and temperature-dependent thermophysical properties on evaporating thin liquid films in microchannels |
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| Authors: | Jun-Jie Zhao Yuan-Yuan Duan Xiao-Dong Wang Bu-Xuan Wang |
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| Affiliation: | 1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China;2. Department of Thermal Engineering, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. Université de Lyon, CNRS, France;2. INSA-Lyon, CETHIL, UMR5008, F-69621, Villeurbanne, France;3. Université Lyon 1, UMR5008, CETHIL, F-69622, France;4. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;1. College of Civil Engineering, Hunan University of Technology, Zhuzhou, Hunan 412007, China;2. College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China;3. Durham School of Architectural Engineering and Construction College of Engineering, University of Nebraska-Lincoln, Omaha, NE, USA;4. Changsha Maxxom High-tech Co. Ltd., Changsha, Hunan 410015, China;1. Department of Chemistry, University of Illinois, Urbana, IL 61801, USA;2. Department of Chemical and Biomolecular Engineering, University of Illinois, Urbana, IL 61801, USA;3. Departments of Chemistry and Astronomy, University of Illinois, Urbana, IL 61801, USA;1. Department of Mathematics, National University of Singapore, Singapore 119076, Singapore;2. Institute of High Performance Computing, Agency for Science, Technology and Research, Singapore, 138632, Singapore;1. University of Dayton Research Institute, Dayton, OH 45469, USA;2. Air Force Research Laboratory, WPAFB, OH 45433, USA |
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| Abstract: | A model based on the augmented Young–Laplace equation and the Clausius–Clapeyron equation was developed to describe the extended evaporating meniscus in a microchannel. The effects of the adsorbed film thickness, channel height and temperature-dependent thermophysical properties of the fluid are included in the model at wall superheats up to 50 K. The liquid flow is coupled with the vapor flow to obtain the mass transport across the liquid–vapor interface. The results show that the constant thermophysical property model greatly overestimates the liquid pressure difference and the total thin film heat transfer rate at higher superheats compared with the variable thermophysical property model. The adsorbed film thickness, which is controlled by the disjoining pressure limit, reaches a minimum near about 20 K superheat for water. The maximum film curvature and liquid pressure difference then decrease at superheats larger than 20 K. The effects of the capillary pressure limit produced by the channel height can be reduced by increasing the superheat. |
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