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化工学报  2015 

双层刚柔组合搅拌桨调控流体宏观不稳定性行为

DOI: 10.11949/j.issn.0438-1157.20141058, PP. 896-904

Keywords: 混合,搅拌容器,传递,宏观不稳定性,流场可视化,双层刚柔组合桨

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Abstract:

流体宏观不稳定性是搅拌槽内流体流动存在大尺度低频非稳态准周期现象,可以影响流体的能量﹑质量的传递行为。为揭示在双层组合桨作用下搅拌槽内流体的非稳态流动规律,实验采用频谱分析和流场可视化技术研究双层组合桨搅拌槽内自来水体系的宏观不稳定性,对比分析了双层刚性桨和双层组合桨对流体混合的影响。结果表明:直径为T的搅拌槽内流体宏观不稳定频率与转速呈线性增大趋势,在转速为180r·min-1时离底距离0.25T刚柔组合桨体系的宏观不稳定性频率消失,出现谱带现象,流场呈现多尺度结构特征,而离底距离为0.33T和0.5T的刚柔组合桨体系的宏观不稳定性频率分别为0.5096Hz和0.3459Hz。双层组合桨体系分别使流体的混合时间缩短了22.5%和35%左右,减小离底距离,可使流场的规则区减小。双层刚柔组合桨调控流体宏观不稳定性,强化流体的能量传递行为,从而缩短混合时间,提高了流体的混合效率。

References

[1]  Chen Zhiping (陈志平), Zhang Xuwen (章序文), Lin Xinghua (林兴华). Handbook of Stirring and Mixing Equipment Design Selection (搅拌与混合设备设计选用手册) [M]. Beijing: Chemical Industry Press, 2004
[2]  Yu Fei (于飞), Bao Yuyun (包雨云), Huang Xiongbin (黄雄斌). Agitating power demand and mixing performance of non-Newtonian fluid with slip behavior in a stirred tank [J]. Journal of Chemical Engineering of Chinese Universities (高校化学工程学报), 2009, 23 (5): 878-884
[3]  Hasal P, Montes J L, Boisson H C, Fort I. Macro-instabilities of velocity field in stirred reactor: detection and analysis [J]. Chemical Engineering Science, 2000, 55 (2): 391-401
[4]  Winardi S, Nagase Y. Unstable phenomenon of flow in a mixing reactor with a marine propeller [J]. Journal of Chemical Engineering of Japan, 1991, 24 (2): 243-249
[5]  Hamm S, Brodly R S, Fasano B. Local heat transfer in a mixing reactor using the heat sensors [J]. Ind. Eng. Chem. Res., 1992, 31: 1384-1391
[6]  Sharp K V, Adrian R J. PIV study of small-scale flow structure around a Rushton turbine [J]. AIChE J., 2001, 47 (4): 766-778
[7]  Fan Jianhua (樊建华), Rao Qi (饶麒), Wang Yundong (王运东), Fei Weiyang (费维扬). Spectral analysis of the velocity fluctuations in a mechanically stirred tank [J]. Journal of Chemical Engineering of Chinese Universities (高校化学工程学报), 2004, 18 (3): 287-292
[8]  Nomura T, Uchida T, Takahashi K. Enhancement of mixing by unsteady agitation of an impeller in an agitated vessel [J]. Journal of Chemical Engineering of Japan, 1997, 30: 875-879
[9]  Bruha O, Fort I, Smolka P. Large scale unsteady phenomena in a mixing vessel [J]. Acta Polotechnica: Czech Tech. Univ. Prague, 1993, 27 (6): 27-33
[10]  Paglianti Alessandro, Liu Zuohua, Montante Giuseppina, Magelli Franco. Effect of macro-instabilities in single- and multiple- impeller stirred tanks [J]. Ind. Eng. Chem. Res., 2008, 47 (14): 4944-4952
[11]  Kresta S M, Wood P E. The flow field produced by a pitched blade turbine: characterization of the turbulence and estimation of the dissipation rate [J]. Chem. Eng. Sci., 1993, 48 (10): 1761-1774
[12]  Liu Zuohua (刘作华), Zeng Qiqin (曾启琴), Wang Yundong (王运东), Sun Ruixiang (孙瑞祥),Ning Weizheng (宁伟征), Tao Changyuan (陶长元). Study on laminar mixing enhanced by flexible impeller in high-viscosity fluid stirred tank [J]. China Science Paper (中国科技论文), 2012, 7 (3): 185-189
[13]  Liu Zuohua (刘作华), Ning Weizheng (宁伟征), Sun Ruixiang (孙瑞祥), Zhou Xiaoxia (周小霞), Tao Changyuan (陶长元). Fractal flow structure in air jet-stirred reactor with double impeller [J]. CIESC Journal (China) (化工学报), 2011, 62 (3): 628-635
[14]  Liu Zuohua (刘作华), Sun Ruixiang (孙瑞祥), Tao Changyuan (陶长元), Ning Weizheng (宁伟征), Peng Hao (彭浩), Zhou Xiaoxia (周小霞), Liu Renlong (刘仁龙), Du Jun (杜军), Fan Xing (范兴), Mou Tianming (牟天明), Sun Dagui (孙大贵), Zuo Zhaohong (左赵宏), Zeng Qiqin (曾启琴), Liao Jun (廖军). A combined type stirring paddle to improve the leaching rate of manganese metal electrolyte [P]: ZL, 201110088762.8. 2012-10-10
[15]  Bresler L, Shinbrot T, Metcalfe G. Isolated mixing regions: origin, robustness and control [J]. Chemical Engineering Science, 1997, 52 (10): 1623-1636
[16]  Paul E L, Atiemo-Obeng V A, Kreste S M. Handbook of Industrial Mixing: Science and Practice [M]. Hoboken: John Wiley & Sons Inc., 2004: 89-143
[17]  FanYurun (范毓润), Lu Zhumin (卢著敏). Periodic and aperiodic chaotic mixing between eccentric cylinders [J]. Journal of Chemical Industry and Engineering (China) (化工学报), 2002, 53 (6): 660-663
[18]  Gao Dianrong (高殿荣), Guo Mingjie (郭明杰), Li Yan (李岩), Fan Zhuoli (范卓立). PIV research on unsteady rotational speed chaotic mixing [J]. Chinese Journal of Mechanical Engineering (机械工程学报), 2006, 42 (8): 44-48
[19]  Liu Zuohua (刘作华), Yang Xianyan (杨鲜艳), Xie Zhaoming (谢昭明), Liu Renlong (刘仁龙), Tao Changyuan (陶长元), Wang Yundong (王运东). Chaotic mixing performance of high-viscosity fluid synergistically intensified by flexible impeller and floating- particles [J]. CIESC Journal (化工学报), 2013, 64 (8): 2795-2800
[20]  Liu Zuohua (刘作华), Tang Qiao (唐巧), Wang Yundong (王运东), Sun Ruixiang (孙瑞祥), Zheng Xiongpan (郑雄攀), Tao Changyuan (陶长元). Enhancement of macro-instability in a mixer-settler with rigid-flexible impeller [J]. CIESC Journal (化工学报), 2014, 65 (1): 78-86
[21]  Liu Zuohua (刘作华), Chen Chao (陈超), Liu Renlong (刘仁龙), Tao Changyuan ( 陶长元), Wang Yundong (王运东). Enhancement of macro-instability in stirred vessel with rigid-flexible combination impeller [J]. CIESC Journal (化工学报), 2014, 65 (1): 61-70
[22]  Liu Zuohua, Zheng Xiongpan, Liu Di, Wang Yundong, Tao Changyuan. Enhancement of liquid-liquid mixing in a mixer-settler by a double rigid-flexible combination impeller [J]. Chem. Eng. Process: Process Intensification, 2014, 86: 69-77

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