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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (5): 127-134.doi: 10.11872/j.issn.1005-2518.2017.05.127

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Effect of Bubble Intake Direction on Bubble Diameters Generated by a Venturi Microbubble Generator

CAO Junya1，MA Mengjie 1，2，LI Pingping 2，LI Xiangyang 2，YANG Chao 2，3   

  1. 1.School of Chemical and Environmental Engineering，China University of Mining Technology （Beijing），Beijing   100083，China；
    2.Key Laboratory of Green Process and Engineering，Institute of Process Engineering，Chinese Academy of Sciences，Beijing   100190，China；
    3.School of Chemistry and Chemical Engineering，University of Chinese Academy of Sciences，Beijing   100049，China
  • Received:2017-05-31 Revised:2017-08-07 Online:2017-10-30 Published:2018-02-12

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Abstract:

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.

Key words:  microbubble, Venturi tube, photographic method, bubble intake direction, bubble diameter, specific surface area

CLC Number: 

  • TQ021

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