Effect of cross sectional shape during condensation in a single square minichannel |
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| Authors: | Davide Del Col Stefano Bortolin Alberto Cavallini Marko Matkovic |
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| Affiliation: | 1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, PR China;2. School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, PR China;1. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Guangrong Rd 409, Beichen District, Tianjin 300134, PR China;2. Microgravity Research Center, Universié libre de Bruxelles, Avenue F.D. Roosevelt 50 CP 165/62, 1050 Brussels, Belgium |
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| Abstract: | The objective of this work is to present new condensation heat transfer coefficients measured inside a single square cross section minichannel, having a 1.18 mm side length, and compare them to the ones previously measured in a circular minichannel. Tests have been performed with R134a at 40 °C saturation temperature, at mass velocity ranging between 200 and 800 kg m?2 s?1. As compared to the heat transfer coefficients measured in the circular cross section channel, for the same hydraulic diameter, in the square minichannel the authors find a heat transfer enhancement at the lowest value of mass velocity, which must be due to the effect of surface tension. No heat transfer coefficient increase has been found at the highest values of the mass velocity where condensation is shear stress dominated. |
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