Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2007, Vol. 18 ›› Issue (4): 247 doi: 10.1016/S1001-8042(07)60055-4

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Experimental research on flow instability in vertical narrow annuli

WU Geping1 QIU Suizheng2 SU Guanghui2 JIA Dounan2   

  1. 1 School of Energy and Power Engineering,Jiangsu University, Zhenjiang 212013, China;
    2 School of Energy and Power Engineering,Xi’an Jiaotong University, Xi’an 710049, China
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WU Geping QIU Suizheng SU Guanghui JIA Dounan. Experimental research on flow instability in vertical narrow annuli.Nuclear Science and Techniques, 2007, 18(4): 247     doi: 10.1016/S1001-8042(07)60055-4

Abstract: A narrow annular test section of 1.5mm gap and 1800mm length was designed and manufactured, with good tightness and insulation. Experiments were carried out to investigate characteristics of flow instability of forced-convection in vertical narrow annuli. Using distilled water as work fluid, the experiments were conducted at pressures of 1.0~3.0MPa, mass flow rates of 3.0~25kg/h, heating power of 3.0~ 6.5kW and inlet fluid temperature of 20 oC, 40 oC or 60 oC. It was found that flow instability occured with fixed inlet condition and heating power when mass flow rate was below a special value. Effects of inlet subcooling, system pressure and mass flow rate on the system behavior were studied and the instability region was given.

Key words: Flow instability, Experimental research, Vertical narrow annuli, Forced-convection