Proceedings of the
International Conference on Mechanical Engineering 2009
(ICME2009) 26- 28 December 2009, Dhaka, Bangladesh

ICME09-FM-30

EFFECT OF GAS WEBER NUMBER ON LIQUID SHEET
BREAKUP

Mohammad Ali , M. Quamrul Islam and R. Mahamud
Department of Mechanical Engineering, Bangladesh University of Engineering and Technology
Dhaka, Bangladesh

ABSTRACT

In this study dynamic behavior of liquid sheet of thermoplastic with co flowing air is discussed and numerically simulated. The Navier-Stokes systems associated with surface tension forces are solved by the Volume of Fluid (VOF) technique with a Continuum Surface Force (CSF) manner. The velocity of liquid is kept constant throughout the study whereas the velocity of air is varies which eventually varies the gas Weber number. Sulpher hexa fluoride (SF6) and high density polyethylene (HDPE) are considered as liquid to investigate the physics of breakup process. The effects of gas Weber number on liquid sheet breakup process are discussed to reveal the underlying physics of liquid disintegration. It is found that under any flow conditions a range of gas Weber number controls the instability for the breakup of liquid sheet. The pressure as well as velocity distribution of the flow field are also discussed to study the breakup processes in details.
 

Keywords: Weber Number, VOF, CSF, Sulpher Hexa Fluoride, HDPE.

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