Experimental Study on the Flow Field in Cryogenic Taylor Bubble Wake in an Inclined Pipe
LIU Yi-peng ZHAO Xian-lin WANG Ping-yang LIN Shuai-nan DU Zhao-hui
School of Mechanical Engineering, Shanghai Jiao Tong University Department of Physics, Henan Institute of Education School of Mechanical Engineering, Shanghai Jiao Tong University School of Mechanical Engineering, Shanghai Jiao Tong University School of Mechanical Engineering, Shanghai Jiao Tong University
Abstract：In order to investigate the complex characteristics in the wake of Taylor bubble in cryogenic liquid tube flow, the flow field in the wake was measured using particle image velocimetry (PIV) technique. The PIV measurement results were further analyzed by snapshot proper orthogonal decomposition (POD). The criterion for determining the wake structure using inverse viscosity number Nf is applicable for liquid nitrogen if surface tension effect can be neglected in a vertical tube, but not applicable for the tube at the inclination of 60o to the horizontal. The Nf number of present experiment is much larger than the critical value for the occurrence of an open wake. However, a closed wake was observed both in instantaneous and average flow field as q being above 60o. The axial size of vortex in the wake (Lwake) increases with the increase of Taylor bubble length (LTB) in an exponential function of Lwake= 51.3-123.5exp(-LTB/2.9). POD analysis shows that the first several POD modes can effectively capture the main features in Taylor bubble wake. The first 4 modes occupy the 15.6%, 6.4%, 5.6% and 3.8% of total energy. The vortexes distribution coincides with the maximum velocity fluctuation. The present study explores the scope of the theory for normal atmospheric temperature liquid.
刘亦鹏 赵先林 王平阳 蔺帅南 杜朝辉. 倾斜管路内低温Taylor气泡尾迹区流场的实验研究[J]. , 2012, 12(6): 909-916.
LIU Yi-peng ZHAO Xian-lin WANG Ping-yang LIN Shuai-nan DU Zhao-hui. Experimental Study on the Flow Field in Cryogenic Taylor Bubble Wake in an Inclined Pipe. , 2012, 12(6): 909-916.
2012, Vol. 12 
