Oscillation characteristics of two horizontal opposed liquid-liquid impinging streams

doi:10.11949/j.issn.0438-1157.20141336

Abstract

Abstract:

The flow field of two horizontal opposed liquid-liquid impinging streams was experimentally studied with the PLIF technology in order to investigate the stability of impingement plane and the oscillation characteristics of stagnation point at various nozzle separations and fluxes. Oscillation period was not regular and frequency concentrated on the low frequency region. While amplitude concentrated on 0.1d-0.5d. When L belonged to [1d, 3d] ( where L was nozzle separation and d was nozzle diameter ), amplitude increased with the growth of L, but when L belonged to [3d, 5d], amplitude decreased with the growth of L. The amplitude of impingement plane did not always grow up with increasing flux, which gradually decreased after reaching a peak. The oscillation characteristics of impingement plane and stagnation point were favorable to mixing and mass transfer.

Key words: impinging stream, stagnation point oscillation, stability, PLIF

摘要：

利用平面激光诱导荧光(PLIF)技术对水平对置双向液体撞击流流场进行了实验研究,考察了等动量下撞击面驻点在不同喷嘴间距、不同进液流量下的稳定性和振荡特性。结果表明,撞击面驻点的振荡并没有一个固定的周期,并且频率主要集中在低频,而其幅度集中在0.1d～0.5d范围内:在L∈[1d,3d](L为喷嘴间距,d为喷嘴直径)范围内,振荡幅度随着L的增加而增大;在L∈[3d,5d]范围内,振荡幅度随着L的增加而减小。同时,撞击面的振荡幅度并不会随着流速的增大而一直增大,而是在达到一个峰值后逐渐降低。撞击面驻点的这种振荡特性对混合和传质具有一定的促进作用。

关键词: 撞击流, 驻点振荡, 稳定性, 平面激光诱导荧光技术

CLC Number:

TQ021.1

ZHANG Jianwei, MA Hongyue, DONG Xin, FENG Ying. Oscillation characteristics of two horizontal opposed liquid-liquid impinging streams[J]. CIESC Journal, 2015, 66(4): 1310-1317.

张建伟, 马红越, 董鑫, 冯颖. 水平对置双向液体撞击流的振荡特性[J]. 化工学报, 2015, 66(4): 1310-1317.

References 23

[1]	Tamir A. Impinging-Stream Reactors--Fundamentals and Applications (撞击流反应器--原理和应用) [M]. Beijing: Chemical Industry Press, 1996
[2]	Tamir A, Kitton A. Application of impinging streams in chemical engineering process review [J]. Chem.Commun., 1987, 50: 241-330
[3]	Wu Yuan (伍沅). Impinging Stream-Theory, Characteristic and Application (撞击流--原理·性质·应用) [M]. Beijing: Chemical Industry Press, 2006: 17
[4]	Denshchikov V A, Kondrat'ev V N, Romashov A N. Interaction between two opposed jets [J]. Fluid Dynamics, 1978, 6: 924-926
[5]	Denshchikov V A, Kondrat 'ev V N, Romashov A N,Chubarov V M . Auto-oscillations of planar colliding jets [J]. Fluid Dynamics, 1983, 3: 460-463
[6]	Johnson D A, Philip E Wood. Self-sustained oscillations in opposed impinging jets in an enclosure [J]. The Canadian Journal of Chemical Engineering, 2000, 78: 867-875
[7]	Kind R, Suthanthiran K. The interaction of opposing plane turbulent wall jets [J]. Fluid Mech., 1973, 58: 389-402
[8]	Rew H, Park S. The interaction of two opposing asymmetric curved jets [J]. Exp.Fluids, 1988, 6: 243-252
[9]	Li Weifeng (李伟锋),Sun Zhigang (孙志刚),Liu Haifeng (刘海峰),Wang Fuchen (王辅臣),Yu Zunhong (于遵宏).Stagnation point offset of two opposed jets [J]. Journal of Chemical Industry and Engineering (China) (化工学报), 2008, 59 (1): 46-52
[10]	Li Weifeng (李伟锋),Sun Zhigang (孙志刚),Liu Haifeng (刘海峰). Stagnation point offset of two asymmetric nozzle opposed jets with large nozzle separation distance [J]. Journal of Chemical Engineering of Chinese Universities (高校化学工程学报), 2009, 23 (6): 990-994
[11]	Sun Zhigang (孙志刚), Li Weifeng (李伟锋), Liu Haifeng (刘海峰), Yu Zunhong (于遵宏). Oscillation characteristics of two planar opposed jets [J]. CIESC Journal (化工学报), 2009, 60 (2): 338-344
[12]	Xu Hongpeng (许宏鹏), Zhao Haibo (赵海波), Zheng Chuguang (郑楚光). Simulation and analysis of periodical oscillation of gas-solids two planar opposed jets [J].CIESC Journal (化工学报), 2013, 64 (6): 1907-1915
[13]	Tu Gongyi (屠功毅), Li Weifeng (李伟锋), Huang Guofeng (黄国峰), Wang Fuchen (王辅臣). Large-eddy simulation and experimental study of deflecting oscillation of planar opposed jets [J]. Acta Phys.Sin. (物理学报), 2013, 62 (8): 084704
[14]	Zhang Jianwei (张建伟), Ma Yandong (马彦东), Feng Ying (冯颖). Development of modern flow measuring technique applied to fluid characteristic research in impinging stream mixer [J].Chemical Industry and Engineering Progress (化工进展), 2012, 31 (2): 268-273
[15]	Du Runping (杜闰萍), Liu Zhe (刘喆),Chen Yi (程易),Luo Peicheng (骆培成). Measurement of temperature field in a fast liquid-liquid mixing process by PLIF [J]. The Chinese Journal of Process Engineering (过程工程学报), 2007, 7 (5): 859-864
[16]	Lin Keli (林柯利), Bi Rongshan (毕荣山), Tan Xinshun (谭心舜), Zheng Shiqing (郑世清). Using PLIF technology to study the turbulent mixing characteristic in a liquid-liquid ejector [J]. Journal of Chemical Engineering of Chinese Universities (高校化学工程学报), 2009, 23 (1): 28-33
[17]	Luo Peicheng (骆培成), Chen Yi (程易), Wang Zhanwen (汪展文), Jin Yong (金涌), Yang Wanhong (杨万宏). Study of fast liquid-liquid micromixing using PLIF technique [J]. Journal of Chemical Industry and Engineering (China) (化工学报), 2005, 56 (12): 2288-2293
[18]	Sun Huaiyu, Wu Yuan, Xu Chenghai. Pressure fluctuation in the submerged circulative impinging stream reactor [J].Chinese J.Chem.Eng., 2006, 14 (4): 428-434
[19]	Sun Huaiyu (孙怀宇), Xu Chenghai (徐成海), Wu Yuan (伍沅). Analysis of pressure fluctuation signal in submerged circulative impinging stream reactor with wavelets transform. [J]. Journal of Northeastern University (东北大学学报), 2006, 27 (11): 1259-1262
[20]	Zhang Jianwei (张建伟), Jiao Li (焦丽). Multi-scale and multi-fractal characteristics of pressure signals in SCISR. [J]. Journal of Chemical Industry and Engineering (China) (化工学报), 2006, 57 (7): 1553-1559
[21]	Zhang Jianwei (张建伟),Wu Yuan (伍沅), Shu Anqing (舒安庆), Xu Chenghai (徐成海). Characteristics of pressure fluctuation in submerged circulative impinging stream reactor [J]. Journal of Chemical Industry and Engineering (China) (化工学报), 2005, 56 (2): 266-269
[22]	Zhang Jianwei (张建伟), Wang Yang (汪洋), Tang Huihua (汤慧华), Jiao Li (焦丽). Multi-scale and multi-fractal characteristics of pressure signals in SCISR. [J]. Journal of Chemical Industry and Engineering (China) (化工学报), 2005, 56 (12): 2309-2314
[23]	Zhang Jianwei (张建伟), Miao Chao (苗超). Hilbert-Huang transform of velocity signal in impinging stream mixer [J]. Journal of Experiments in Fluid Mechanics (实验流体力学), 2010, 24 (4): 66-70