Heat transfer and hydrodynamics of channelled cryogenic liquids in fields of centrifugal forces |
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| Affiliation: | 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China;1. Lebanese International University LIU, Mechanical Engineering Dept., P.O. Box 146404 Mazraa, Beirut, Lebanon;2. Université Lille Nord de France, F-59000 Lille, France;3. Mines Douai, EI, F-59500 Douai, France;4. University of Angers – ISTIA, LARIS – EA 7315, Angers, France;1. Multiphase Reactors Engineering and Applications Laboratory (mReal), Department of Chemical & Biochemical Engineering, Missouri University of Science & Technology, Rolla, MO 65409 USA;2. Chemical Engineering Department, College of Engineering, Al-Nahrain University, Baghdad, Iraq;1. Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, Harbin, 150040, PR China;2. College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, PR China;1. Department of Mechanical Engineering, Kallam Haranadhareddy Institute of Technology, Guntur, India;2. Department of Mechanical Engineering, Bapatla Engineering College, Bapatla, India |
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| Abstract: | This Paper reports experimental results on the hydrodynamics and heat transfer during a free-convective and forced motion of cryogenic liquids within a channel in the field of centrifugal forces. Investigations were carried out on the hydrodynamics and heat transfer of a two-phase flow of nitrogen and helium in the heated axial part of the ⊓-shaped duct in the 50–300 range of relative accelerations. It was found that during the free-convective motion the volume flow of liquid nitrogen, with heat fluxes varying from 3 × 103 to 1 × 104Wm−2, increased more than 30 times. The volume flow is accompanied by large oscillations and increases with growing relative accelerations. The heat transfer coefficients also are shown to grow with the relative acceleration, which is due to an increase in the hydrostatic pressure at the radial inlet of the duct. Experimental results are presented concerning the heat transfer intensity during forced motion of two-phase helium along a heated axial channel of a rotating □-shaped duct at flow rates <- 7.5 × 10−5kgs−1. At the relative acceleration of ≈ 100 the heat transfer and critical heat flux are observed to increase with the flow rate. At flow rates <- 10−4 kg s−1the heat transfer to helium is the same as during pool boiling. |
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