Journal of Central South University of Technology

, Volume 12, Issue 6, pp 677–681 | Cite as

Bubble size measurement in three-phase system using photograph technology

  • Sun Wei Email author
  • Hu Yue-hua 
  • Liu Run-qing 


A special experiment setup was designed to observe the interaction between bubbles and particle in flotation cell and to analyze the bubble characteristics such as bubble size, distribution and bubble-loading efficiency. Bubbles in water-gas system and three-phase system were measured. The results indicate that with the current setup the bubbles as small as 10 µm can be easily distinguished. The average size of the bubbles generated under the given conditions in two-phase system is 410 µm at frother concentration of 0.004%, which is in good correspondence with the results of other works. The effect of frother on bubble size was probed. Increasing frother concentration from 0 to 0.004% causes a reduction of bubble size from 700 to 400 µm. The bubble loading efficiency was reported. The result indicates that the fine particle is more easily entrapped than the coarse particle. Some factors, which have effect on measurement accuracy were discussed. The aeration speed has a significant effect on the accuracy of results, if it surpasses 30 mL/s, and the image becomes unclear due to the entrapment of fine particle. Another factor, which can affect observing results, is the sampling position. At a wrong sampling position, the images become unclear.

Key words

bubble size measurement photographic observation method flotation fine particles 

CLC number



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  1. [1]
    Clift R, Grace J R, Weber M E. Bubbles, Drops and Particles[M]. New York: Academic Press, 1978.Google Scholar
  2. [2]
    Lovett D A, Travers S M. Dissolved air flotation for abattoir wastewater [J]. Water Research, 1986, 20(4): 421–426.CrossRefGoogle Scholar
  3. [3]
    Jameson G J. Hydrophobic and floc density in induced-air flotation for water treatment[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1999, 151(1–2): 269–281.CrossRefGoogle Scholar
  4. [4]
    Kawase Y, Halard B, Moo-Young M, et al. Liquid phase mass transfer coefficients in bioreactors [J]. Biotechnology Bioengineering, 1992, 39: 1133–1140.CrossRefGoogle Scholar
  5. [5]
    Ahmed N, Jameson G J. The effect of bubble size on the rate of flotation of fine particles [J]. International Journal of Mineral Processing, 1985, 14(3): 195–215.CrossRefGoogle Scholar
  6. [6]
    Dai Z F, Daniel F, John R. Particle-bubble attachment in mineral flotation [J]. Journal of Colloid and Interface Science, 1999, 217(1): 70–76.CrossRefGoogle Scholar
  7. [7]
    Dai Z F, Daniel F, John R. Particle-bubble collision models: a review [J]. Advances in Colloid and Interface Science, 2000, 85(2–3): 231–256.CrossRefGoogle Scholar
  8. [8]
    Boyd J W R, Varley J. The uses of passive measurement of acoustic emissions from chemical engineering processes[J]. Chemical Engineering Science, 2001, 56(5): 1749–1767.CrossRefGoogle Scholar
  9. [9]
    Rossi G L. A new intensity modulation based fiber optic probe for bubble shape detection, velocity and diameter measurements[J]. Review of Scientific Instruments, 1996, 67(7): 2541–2544.CrossRefGoogle Scholar
  10. [10]
    Beck M, Lee K T, Stanley-Wood N G. A new method for evaluating the size of solid particles flowing in a turbulent fluid[J]. Powder Technology, 1973, 8: 85–92.CrossRefGoogle Scholar
  11. [11]
    Lu W M, Lin L C. Gas dispersion and bubble size distribution in dual impeller stirred vessels [J]. Journal of the Chinese Institute of Chemical Engineering, 1995, 26(2): 119–125.Google Scholar
  12. [12]
    Leifer I, de Leeuw G, Kunz G, et al. Calibrating optical bubble size by the displaced-mass method[J]. Chemical Engineering Science, 2003, 58 (23–24): 5211–5216.CrossRefGoogle Scholar
  13. [13]
    Hepworth N J, Hammond J R M, Novel J V. Application of computer vision to determine bubble size distributions in beer [J]. Journal of Food Engineering 2004, 61: 119–124.CrossRefGoogle Scholar
  14. [14]
    Drenckhan W F, Hutzler E S, Weaire D E, et al. Bubble size control and measurement in the generation of ferro fluid foams[J]. Journal of Applied Physics, 2003, 93(12): 10078–10083.CrossRefGoogle Scholar
  15. [15]
    Leifer I. Optical measurement of bubbles: system design and application [J]. Journal of Atmospheric and Oeanic Technology, 2003, 20: 1317–1332.CrossRefGoogle Scholar
  16. [16]
    Wang W X, Xu Z H, Masliyah J H, et al. An induction time model for the attachment of an air bubble to a hydrophobic sphere in aqueous solutions[J]. International Journal of Mineral Processing, 2005, 75(1–2): 69–82.CrossRefGoogle Scholar
  17. [17]
    Gu G X, Xu Z H, Nandakumar K, et al. Effects of physical environment on induction time of air-bitumen attachment [J]. International Journal of Mineral Processing, 2003, 69(1–4): 235–250.CrossRefGoogle Scholar
  18. [18]
    Rodrigues R T, Rubio J. New basis for measuring the size distribution of bubbles[J]. Mineral Engineering, 2003, 16(8): 757–765.CrossRefGoogle Scholar

Copyright information

© Central South University 2005

Authors and Affiliations

  1. 1.School of Resources Processing and BioengineeringCentral South UniversityChangshaChina

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