Experimental study of onset of subcooled annular flow boiling |
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| Authors: | R Ahmadi A Nouri-Borujerdi J Jafari I Tabatabaei |
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| Affiliation: | 1. Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;2. Reactors and accelerators R&D School, Nuclear science and technology research institute Tehran, Iran;1. School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Victoria 3083, Australia;2. Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSW 2234, Australia;3. School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia;1. School of Mechanical Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea;2. Future and Challenge Co., Ltd., 46 Tapsil-ro, Giheung-gu, Yongin-si, Gyeonggi-do 17084, Republic of Korea;1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China;2. Wuhan Second Ship Design and Research Institute, Wuhan, Hubei 430205, China;1. Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Korea Atomic Energy Research Institute, 1045 Daeduk-Daero, Dukjin-Dong, Yuseong-gu, Daejeon 305-353, Republic of Korea |
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| Abstract: | An experimental study on the onset of nucleate boiling (ONB) is performed for water annular flow to provide a systematic database for low pressure and velocity conditions. A parametric study has been conducted to investigate the effect of pressure, inlet subcooling, heat and mass flux on flow boiling. The test section includes a Pyrex tube with 21 mm inner diameter and a stainless steel (SS-304) rod with outer diameter of 6 mm. Pressure, heat and mass flux are in the range of 1.73 < P < 3.82 bar, 40 < q < 450 kW/m2 and 70 < G < 620 kg/m2 s, respectively. The results illustrate that inception heat flux is extremely dependent on pressure, inlet subcooling temperature and mass flux; for example in pressure, velocity and inlet subcooling as 3.27 bar, 230 kg/m2 s and 41.3 °C; consequently qw,ONB is 177.3 kW/m2. In other case with higher inlet temperature of 71.5 °C and with P, 3.13 bar and G, 232 kg/m2 s the inception heat flux reached to 101.6 kW/m2. The data of ONB heat flux are over estimated from the existing correlation, and maximum deviation of wall superheat (ΔTw,ONB) from correlations is 30%. Experimental data of inception heat flux are within 22% of that predicted from the correlation. |
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