Effect of Bubble Intake Direction on Bubble Diameters Generated by a Venturi Microbubble Generator
Received date: 2017-05-31
Revised date: 2017-08-07
Online published: 2018-02-12
The self-suction method was often adopted to feed bubbles to the Venturi microbubble generator,which could lead to insufficient flux of microbubbles in engineering applications.In this paper,the compressed air was used to replace the self-suction method,the effect of three bubble intake directions(cross-current,co-current and contra-current) on the bubble diameters generated by a Venturi microbubble generator was investigated by photographic method.The results show that the critical liquid flow rate at the throat is about 4.72 m/s to generate an intensive turbulent shear field to break bubbles into microbubbles(~200 μm);3-amyl alcohol can stable the microbubbles by restraining the processes of coalescence and breakup as the bubbles generated in the Venturi tube flowed to test tank.Thus,bubble diameters at different positions of the test tank can keep the same.In the case of cross-current,bubbles were closer to the wall where the turbulent shear was weaker,which led to greater bubble diameters.The bubble detachment time of the co-current was shorter than that of the contra-current under the same conditions,which led to minimum bubble sizes.The specific surface area is the greatest in the case of cocurrent and about 3 times of cross-current,which is very advantageous to gas-liquid mass transfer.
CAO Junya , MA Mengjie , LI Pingping , LI Xiangyang , YANG Chao . Effect of Bubble Intake Direction on Bubble Diameters Generated by a Venturi Microbubble Generator[J]. Gold Science and Technology, 2017 , 25(5) : 127 -134 . DOI: 10.11872/j.issn.1005-2518.2017.05.127
[1] Sokolichin A,EigenbergerG,Lapin A.Simulation of buoyancy driven bubbly flow:Established simplifications and open questions[J].AIChE Journal,2004,50(1):24-45.
[2] Fayolle Y,Cockx A,Gillot S,et al.Oxygen transfer prediction in aeration tanks using CFD[J].Chemical Engineering Science,2007,62(24):7163-7171.
[3] Parmar R,Majumder S K.Microbubble generation and micro-bubble-aided transport process intensification——A state- of-the-art report[J].Chemical Engineering and Processing:Process Intensification,2013,64(2):79-97.
[4] Bao Xuteng,Chen Qingyu,Xu Zhiqiang,et al.Overview of research advances and application of micro-nano bubbles technology in fishery and aquaculture sector[J].Water Purification Technology,2016,35(4):16-22.[鲍旭腾,陈庆余,徐志强,等.微纳米气泡技术在渔业水产行业的研究进展及应用综述[J].净水技术,2016,35(4):16-22.]
[5] Tsuge H.Micro- and Nanobubbles:Fundamentals and Applications[M].Boca Raton:CRC Press,2014.
[6] Li Yan,Li Jianzhong,Ye Junqiang,et al.Comparison the effects of using microporous oxygen aerator and impeller oxygen aerator on the Penaeus vannamei culturing in the ponds[J].Fishery Modernization,2012,39(6):21-25.[李燕,李建忠,叶军强,等.微孔曝气增氧与叶轮增氧机增氧在南美白对虾池塘养殖的应用比较[J].渔业现代化,2012,39(6):21-25.]
[7] Liu Liang,Liu Jiongtian,Liu Guangyu.Application of cyclonic static micro-bubble flotation column in cleaning flotation of a refratory molybdenum ore[J].Multipurpose Utilization of Mineral Resources,2009(2):15-18. [刘亮,刘炯天,刘广宇.旋流静态微泡浮选柱在极难选辉钼矿精选中的应用[J].矿产综合利用,2009(2):15-18.]
[8] Terasaka K,Aoki S,Kobayashi D.Removal of iron oxide fine particles from waste water using microbubble flotation[J].Progress in Multiphase Flow Research,2008,3:43-50.
[9] Santana R C,Ribeiro J A,Santos M A,et al.Flotation of fine apatitic ore using microbubbles[J].Separation and Purification Technology,2012,98(39):402-409.
[10] Rodrigues R T,Rubio J.DAF-dissolved air flotation: Potential applications in the mining and mineral processing industry[J].International Journal of Mineral Processing,2007,82(1):1-13.
[11] Terasaka K,Hirabayashi A,Nishino T.Development of micro-bubble aerator for waste water treatment using aerobic activated sludge[J].Chemical Engineering Science,2011,66(14):3172-3179.
[12] Lee E J,Kim Y H,Kim H S,et al.Influence of microbubble in physical cleaning of MF membrane process for waste-water reuse[J].Environmental Science and Pollution Research International,2015,22(11):8451-8459.
[13] Zhang Lei,Liu Ping,Ma Jin,et al.Wastewater treatment using a microbubble aerated biofilm reactor[J].Environmental Science,2013,34(6):2277-2282.[张磊,刘平,马锦,等.基于微气泡曝气的生物膜反应器处理废水研究[J].环境科学,2013,34(6):2277-2282.]
[14] Tsuge H,Li P.Water treatment by induced air flotation using microbubbles[J].Journal of Chemical Engineering of Japan,2006,39(8):896-903.
[15] Bull J L.The application of microbubbles for targeted drug delivery[J].Expert Opinion on Drug Delivery,2007,4(5):475-493.
[16] Tinkov S,Bekeredjian R,Winter G,et al.Microbubbles as ultrasound triggered drug carriers[J].Journal of Pharma-ceutical Sciences,2009,98(6):1935-1961.
[17] Tsutsui J M,Xie F,Porter R T.The use of microbubbles to target drug delivery[J].Cardiovascular Ultrasound,2004,2(1):23-30.
[18] Fujiwara A,Shu T,Watanabe K,et al.Experimental study on the new micro-bubble generator and its application to water purification system[C]//4th Joint Fluids Summer Engineering Conference.Hawaii:The American Society of Mechanical Engineers,2003:469-473.
[19] Preston A T,Colonius T,Brennen C E.A numerical investigation of unsteady bubbly cavitating nozzle flows[J].Physics of Fluids,2002,14(1):300-311.
[20] Tang Wencai,Yan Changqi,Sun Licheng,et al.Characteristic of bubble breakup in venturi-type bubble generator[J].Atomic Energy Science and Technology,2014,48(5):844-848.[唐文偲,阎昌琪,孙立成,等.文丘里式气泡发生器气泡碎化特性研究[J].原子能科学技术,2014,48(5):844-848.]
[21] Kaneko A,Gong X,Shu T,et al.Development of micro-bubble generator and its utilization to enhance the mass transfer in the bubble plumes and columns[C]// Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conference,10th International Conference on Nanochannels,Microchannels,and Minichannels.Puerto Rico:The American Society of Mechanical Engineers,2012:191-196.
[22]Yin J L,Li J J,Li H,et al.Experimental study on the bubble generation characteristics for an venturi type bubble generator[J].International Journal of Heat and Mass Transfer, 2015, 91:218-224.
[23] 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.
[24] Zu Liangzhu.Gas-Liquid Mass Transfer Characteristics in Stirred Tanks by Microbubble Aeration[D].Nanjing:Nanjing Tech University,2014.[祖良柱.微气泡供气搅拌槽反应器内气液传质特性研究[D].南京:南京工业大学,2014.]
[25] Chen Fangyuan,Li Pingping,Li Xiangyang,et al.An immerged fibre-optic photoimaging method for measurement of bubble size [J].The Chinese Journal of Process Engineering,2016,16(3):361-366.[陈方圆,李平平,李向阳,等.侵入式光纤照相法测量气泡尺寸分布[J].过程工程学报,2016,16(3):361-366.]
[26] Li X Y,Li P P,Zu L Z,et al.Gas-liquid mass transfer characteristics with microbubble aeration-I.Standard stirred tank[J].Chemical Engineering & Technology,2016,39(5):945-952.
/
〈 | 〉 |