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JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)  2017, Vol. 51 Issue (10): 2070-2076    DOI: 10.3785/j.issn.1008-973X.2017.10.023
Environmental Engineering, Chemical Engineering     
Bubble size and its distribution for Venturi bubble generator
YAN Pan, HUANG Zheng-liang, WANG Jing-dai, JIANG Bin-bo, YANG Yong-rong
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  

The Venturi bubble generator was applied in the micro bubble column reactor based on the air-water system in order to analyze the influences of operating conditions and structural parameters on the bubble size distribution and bubble Sauter mean diameter by the high speed camera. Results show that the bubble Sauter mean diameter increases under higher gas flow rate whereas it decreases under higher liquid flow rate. The bubble Sauter mean diameter reaches the minimum when air holes are located at the Venturi throat. When liquid velocity at the Venturi throat ranges from 0.983 to 2.949 m/s, bubble Sauter mean diameter decreases with the increase in the number of air holes. While liquid velocity at the Venturi throat ranges from 3.932 to 4.915 m/s, bubble Sauter mean diameter decreases at first and then slightly increases. The number of the air hole has little influence on bubble Sauter mean diameter when it is more than 6. An empirical correlation of bubble Sauter mean diameter based on ReL and ReG was proposed through the regression analysis. The calculated values accorded well with the experimental data.



Received: 29 August 2016      Published: 27 September 2017
CLC:  TQ021  
Cite this article:

YAN Pan, HUANG Zheng-liang, WANG Jing-dai, JIANG Bin-bo, YANG Yong-rong. Bubble size and its distribution for Venturi bubble generator. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(10): 2070-2076.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2017.10.023     OR     http://www.zjujournals.com/eng/Y2017/V51/I10/2070


文丘里气泡发生器的气泡尺寸及分布

提出使用文丘里气泡发生器的微鼓泡反应器,以空气-水为模拟介质,高速相机为测量手段,考察操作条件和结构参数对文丘里气泡发生器气泡尺寸分布、气泡Sauter平均直径的影响.研究发现,文丘里气泡发生器的气泡Sauter平均直径随着气量的增大而增大,随着液量的增大而减小;当气孔位置位于喉管处时,气泡Sauter平均直径最小;当喉管液速为0.983~2.949 m/s时,气泡Sauter平均直径随气孔数量的增加而减小;当喉管液速为3.932~4.915 m/s时,气泡Sauter平均直径随气孔数量的增加先减小后略有增大,当开孔数大于6时,气孔数量对气泡Sauter平均直径的影响较小.通过对多组实验的回归分析,提出气泡Sauter平均直径与液相雷诺数、气相雷诺数的经验关联式,计算值与实际值吻合较好.

[1] TERASAKA K, HIRABAYASHI A, NISHINO T, et al. Development of microbubble aerator for waste water treatment using aerobic activated sludge[J]. Chemical Engineering Science, 2011, 66(14):3172-3179.
[2] DEVATINE A, CHICIUC I, POUPOT C, et al. Micro-oxygenation of wine in presence of dissolved carbon dioxide[J]. Chemical Engineering Science, 2007,62(17):4579-4588.
[3] AGO K, NAGASAWA K, TAKITA J, et al. Development of an aerobic cultivation system by using a microbubble aeration technology[J]. Journal of Chemical Engineering of Japan, 2005, 38(9):757-762.
[4] PARMAR R, MAJUMDER S K. Microbubble generation and microbubble-aided transport process intensification:a state-of-the-art report[J]. Chemical Engineering and Processing:Process Intensification, 2013, 64(2):79-97.
[5] TELMADARREIR A, DODA A, TRIVEDI J J, et al. CO2 microbubbles:a potential fluid for enhanced oil recovery:bulk and porous media studies[J]. Journal of Petroleum Science and Engineering, 2016, 138:160-173.
[6] ROVERS T A M, SALA G, VAN-DER-LINDEN E, et al. Temperature is key to yield and stability of BSA stabilized microbubbles[J]. Food Hydrocolloids, 2016, 52:106-115.
[7] ONARI H, WATANABE K, MAEDE K, et al. High functional characteristics of micro-bubbles and water purification[J]. Resources Processing, 1999, 46(4):238-244.
[8] TERASAKA K, SHINPO Y. Recovery of fine carbon particles from water using microbubble flotation[C]//6th International Conference on Multiphase Flow. Leipzig, Germany:ICMF, 2007:2-7.
[9] SADATOMI M, KAWAHARA A, KANO K, et al. Performance of a new micro-bubble generator with a spherical body in a flowing water tube[J]. Experimental Thermal and Fluid Science, 2005, 29(5):615-623.
[10] SADATOMI M, KAWAHARA A, MATSUURA H, et al. Micro-bubble generation rate and bubble dissolution rate into water by a simple multi-fluid mixer with orifice and porous tube[J]. Experimental Thermal and Fluid Science, 2012, 41(41):23-30.
[11] GABBARD C H. Development of a Venturi type bubble generator for use in the molten-salt reactor xenon removal system[R]. Danbury:U.S. Union Carbide Corporation, 1972.
[12] GORDIYCHUK A, SVANERA M, BENINI S, et al. Size distribution and Sauter mean diameter of micro bubbles for a Venturi type bubble generator[J]. Experimental Thermal and Fluid Science, 2016, 70:51-60.
[13] AKITA K, YOSHIDA F. Bubble size, interfacial area, and liquid-phase mass transfer coefficient in bubble columns[J]. Industrial and Engineering Chemistry Process Design and Development, 1974, 13(1):84-91.
[14] BORDAS M L, CARTELLIER A, SECHET P, et al. Bubbly flow through fixed beds:microscale experiments in the dilute regime and modeling[J]. AIChE Journal, 2006, 52(11):3722-3743.
[15] LI G, YANG X, DAI G. CFD simulation of effects of the configuration of gas distributors on gas-liquid flow and mixing in a bubble column[J]. Chemical Engineering Science, 2009, 64(24):5104-5116.
[16] CHYANG C S, LIEU K, HONG S S. The effect of distributor design on gas dispersion in a bubbling fluidized bed[J]. Journal of the Chinese Institute of Chemical Engineers, 2008, 39(6):685-692.
[17] BHATIA B, NIGAM K D P, AUBAN D, et al. Effect of a new high porosity packing on hydrodynamics and mass transfer in bubble columns[J]. Chemical Engineering and Processing:Process Intensification, 2004, 43(11):1371-1380.
[18] MALDONADO J G G, BASTOUL D, BAIG S, et al. Effect of solid characteristics on hydrodynamic and mass transfer in a fixed bed reactor operating in co-current gas-liquid up flow[J]. Chemical Engineering and Processing:Process Intensification, 2008, 47(8):1190-1200.
[19] JO D, REVANKAR S T. Effect of coalescence and breakup on bubble size distributions in a two-dimensional packed bed[J]. Chemical Engineering Science, 2010, 65(14):4231-4238.
[20] WANG Y C, CHEN E. Effects of phase relative motion on critical bubbly flows through a converging-diverging nozzle[J]. Physics of Fluids, 2002, 14(9):3215-3223.

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