Pool boiling heat transfer on the tube surface in an inclined annulus |
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| Authors: | Myeong-Gie Kang |
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| Affiliation: | 1. Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan;2. Department of Mechanical Engineering, University of Engineering and Technology, Taxila, Pakistan;3. School of Chemical Engineering, The University of Queensland, St Lucia 4072, Australia;4. Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;5. Research Center of Energy Conservation for New Generation of Residential, Commercial, Industrial Sectors, National Taipei University of Technology, Taipei 10608, Taiwan |
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| Abstract: | An experimental study was carried out to investigate the pool boiling heat transfer in an inclined annular tube submerged in a pool of saturated water at atmospheric pressure. The outer diameter and the length of the heated inner tube were 25.4 mm and 500 mm, respectively. The gap size of the annulus was 15 mm. For the tests, annuli with both open and closed bottoms were considered. The inclination angle was varied from the horizontal position to the vertical position. At a given heat flux, the heat transfer coefficient was increased with the inclination angle increase. Effects of the inclination angle on heat transfer were more clearly observed in the annulus with open bottoms. The main cause for the tendencies was considered as the difference in the intensity of liquid agitation and bubble coalescence due to the enclosure by the outer tube. One of the important factors in the annulus with open bottom was the convective fluid flow. |
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