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Journal of Mechanical Science and Technology

, Volume 32, Issue 12, pp 5723–5728 | Cite as

Aircore mechanism during draining based on influence of pressure difference and drain port diameter

  • Kamran Nazir
  • Chang Hyun SohnEmail author
Article
  • 11 Downloads

Abstract

An understanding of the mechanism of aircore phenomenon during draining is very important. In this study, numerical simulations were conducted for different pressurized and suction pressure water tanks, as well as for different drain port diameters, to explain and validate the proposed aircore mechanism. It was found that increasing the pressure at the top surface of the tank results in suppression of the aircore, whereas an increase in the suction pressure at the drain port outlet enhances the development of the aircore. For different drain port diameters, it was observed that the duration of the aircore during draining decreases with a decrease in the drain port diameter, and that the aircore is suppressed for a very small drain port diameter.

Keywords

Aircore mechanism Pressure difference Drain port diameter Cylindrical tanks draining Drain time 

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References

  1. [1]
    B. T. Lubin and G. S. Springer, The formation of a dip on the surface of a liquid draining from a tank, Journal of Fluid Mechanics, 29 (2) (1967) 385–390.CrossRefGoogle Scholar
  2. [2]
    Q. N. Zhou and W. P. Graebel, Axisymmetric draining of cylindrical tank with a free surface, Journal of Fluid Mechanics, 221 (1980) 511–532.CrossRefzbMATHGoogle Scholar
  3. [3]
    C. H. Sohn, S. J. Hyeon and I. S. Park, Numerical analysis of vortex core phenomenon during draining from cylinder tank for various initial swirling speeds and various tank and drain port sizes, Journal of Hydrodynamics, 25 (2) (2013) 183–195.CrossRefGoogle Scholar
  4. [4]
    A. Kumar, J. Joykutty, R. K. Shaji and A. R. Srikrishnan, Vortex suppression through drain port sizing, Journal of Aerospace Engineering, 29 (4) (2016) 06016002.CrossRefGoogle Scholar
  5. [5]
    K. Ramamurthi and T. J. Tharakan, Shaped discharge ports for draining liquids, Journal of Spacecraft and Rockets (AIAA), 30 (6) (1992) 786–788.CrossRefGoogle Scholar
  6. [6]
    C. H. Sohn, M. G. Ju and B. H. L. Gowda, Eccentric drain port to prevent vortexing during draining from cylindrical tanks, Journal of Spacecraft and Rockets, 45 (3) (2008) 638–640.CrossRefGoogle Scholar
  7. [7]
    B. H. L. Gowda, P. J. Joshy and S. Swarnamani, Device to suppress vortexing during draining from cylindrical tanks, Journal of Spacecraft and Rockets, 33 (4) (1996) 598–600.CrossRefGoogle Scholar
  8. [8]
    I. S. Park and C. H. Sohn, Experimental and numerical study on air cores for cylindrical tank draining, International Communications in Heat and Mass Transfer, 38 (8) (2011) 1044–1049.CrossRefGoogle Scholar
  9. [9]
    C. H. Sohn, M. G. Ju and B. H. L. Gowda, Draining from cylindrical tanks with vane–type suppressors–A PIV study, Journal of Visualization, 12 (4) (2009) 347–360.CrossRefGoogle Scholar
  10. [10]
    C. H. Sohn, M. G. Ju and B. H. L. Gowda, PIV study of vortexing during draining from square tanks, Journal of Mechanical Science and Technology, 24 (4) (2010) 951–960.CrossRefGoogle Scholar
  11. [11]
    J. H. Son, C. H. Sohn and I. S. Park, Numerical study of 3–D air core phenomenon during liquid draining, Journal of Mechanical Science and Technology, 29 (10) (2015) 4247–4257.CrossRefGoogle Scholar
  12. [12]
    K. Nazir and C. H. Sohn, Study of aircore phenomenon and influence of water height during liquid draining, Journal of Mechanical Science and Technology, 31 (8) (2017) 3831–3837.CrossRefGoogle Scholar
  13. [13]
    K. Nazir and C. H. Sohn, Effect of water temperature on aircore generation and disappearance during draining, Journal of Mechanical Science and Technology, 32 (2) (2018) 703–708.CrossRefGoogle Scholar
  14. [14]
    P. Basu, D. Agarwal, T. J. Tharakan and A. Salih, Numerical studies on air–core vortex formation during draining of liquids from tanks, International Journal of Fluids Mechanics Research, 40 (1) (2013) 27–41.CrossRefGoogle Scholar
  15. [15]
    FLUENT INC., Fluent 13 Users guide [M].Google Scholar
  16. [16]
    C. W. Hirt and B. D. Nichols, Volume of fluid (VOF) method for the dynamics of free boundaries, Journal of Computational Physics, 39 (1981) 201–225.CrossRefzbMATHGoogle Scholar

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Mechanical EngineeringKyungpook National UniversityDaeguKorea
  2. 2.School of Engineering and TechnologyNational University of TechnologyIslamabadPakistan

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