池式夹带实验及数值模拟
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摘要
在总高1.633m,内径0.35m的不锈钢容器内对空气-水两相进行池式夹带实验研究,并采用VOF法对容器内气液两相流动行为及夹带率进行模拟。依据实验和模拟结果,定量定性分析了气相空间高度和气速对夹带率的影响。随气相空间的增加,夹带率迅速下降并趋于稳定;随气速的增加,夹带率呈现出局部波动、整体上升的复杂规律。分析表明,气相空间高度在决定液体是否会被夹带出容器起着重要的作用,气速对气液界面处形成液滴的尺寸影响较大,较大气速时产生二次夹带使夹带率上升。
An experimental study on the pool entrainment of air-water two-phase was carried out in a stainless steel vessel with a total height of 1.633 m and an inner diameter of 0.35 m. The VOF(volume of fluid) is used to simulate the gas-liquid flow behavior and the entrainment. Based on experimental and numerical results, the effects of gas velocity and vapor space on the entrainment is qualitatively and qualitatively analyzed. As the gas space increases, the entrainmentrate decreases rapidly and tends to be stable. As the gas velocity increases, the entrainment shows an overall upward trend with local slight fluctuations. The analysis shows that the gas velocity has a great in-fluence on the droplet size distribution at the gas-liquid interface, and the initial liquid level plays an important role in determining whether the liquid will be carried out from the vessel. Reentrainment occurs at larger gas velocity, which increases the entrainment.
An experimental study on the pool entrainment of air-water two-phase was carried out in a stainless steel vessel with a total height of 1.633 m and an inner diameter of 0.35 m. The VOF(volume of fluid) is used to simulate the gas-liquid flow behavior and the entrainment. Based on experimental and numerical results, the effects of gas velocity and vapor space on the entrainment is qualitatively and qualitatively analyzed. As the gas space increases, the entrainmentrate decreases rapidly and tends to be stable. As the gas velocity increases, the entrainment shows an overall upward trend with local slight fluctuations. The analysis shows that the gas velocity has a great in-fluence on the droplet size distribution at the gas-liquid interface, and the initial liquid level plays an important role in determining whether the liquid will be carried out from the vessel. Reentrainment occurs at larger gas velocity, which increases the entrainment.
引文
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[10] Lu M,Xie H. An Investigation of Pool Entrainment Based on the Method of Volume of Fluid[J]. Nuclear Engineering and Design,2017, 318:72-84.
[2]王亦飞,陈意心,刘霞.新型洗涤冷却室内的气体带液问题[J].化学反应工程与工艺, 2008, 24(1):24-28.
[3] Prabhudharwadkar D M, More R Z, Iyer K N. Experimental study of liquid carryover in a separator drum[J]. Nuclear Engineering&Design, 2010, 240(1):76-83.
[4] Sun D C, Xiang Y, Tian W X. Experimental investigation of upper plenum entrainment in AP1000[J]. Atomic Energy Science&Technology, 2015, 80(80):80-85.
[5] Kientzler C F, Arons A B, Blanchard D C. Photographic Investigation of the Projection of Droplets by Bubbles Bursting at a Water Surface[J]. Tellus, 2010, 6(1):1-7.
[6] Koch M K, A. Vo?nacke, Starflinger J. Radionuclide re-entrainment at bubbling water pool surfaces[J]. Journal of Aerosol Science,2000, 31(9):1015-1028.
[7] Kim C H, No H C. Liquid entrainment and off-take through the break at the top of a vessel[J]. Nuclear Engineering&Design,2005, 235(16):1675-1685.
[8] Zhang P, Chen P, Li W. An experimental study of pool entrainment in high gas flux region[J]. Progress in Nuclear Energy, 2016, 89:191-196.
[9] Thomas Hohne, Susann Honsch. A droplet entrainment model for horizontal segregated flows[J]. Nuclear Engineering&Design, 2015,286:18-26.
[10] Lu M,Xie H. An Investigation of Pool Entrainment Based on the Method of Volume of Fluid[J]. Nuclear Engineering and Design,2017, 318:72-84.