Effects of the upper inflow area on pool boiling heat transfer in a vertical annulus |
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| Authors: | Myeong-Gie Kang |
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| Affiliation: | 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2. The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, China;1. Department of Mechanical Engineering, LEPTEN – Laboratory of Process Engineering and Energy Technology, Federal University of Santa Catarina, 88010-900 Florianópolis, SC, Brazil;2. UNESP – Univ Estadual Paulista, Department of Mechanical Engineering, Av. Brasil Centro, 56, 15385-000 Ilha Solteira, SP, Brazil;1. Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110, 8th street, Troy, NY 12180, USA;2. Department of Mechanical and Aerospace Engineering, University of Central Florida, 12760 Pegasus Drive, Orlando, Fl 32816-2450, USA |
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| Abstract: | The upper inflow area has been changed to identify the effects of it on pool boiling heat transfer in a vertical annulus. Both bottom inflow conditions of the open and the closed are considered for the study. For the test, a heated tube of 25.4 mm diameter and the water at atmospheric pressure have been used. The ratios of the gaps have been varied from 0.18 to 1. Effects of the inflow area on heat transfer become evident as the heat flux increases and the gap ratio decreases. If the gap ratio is smaller than 0.51 and the heat flux is higher than 60 kW/m2, a noticeable decrease in heat transfer is observed. The major cause for the tendency is attributed to the formation of a lumped bubble around the upper regions of the annulus. |
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