Published 12 issues per year
ISSN Print: 1044-5110
ISSN Online: 1936-2684
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A PARAMETRIC NUMERICAL STUDY OF THE HEAD-ON COLLISION BEHAVIOR OF DROPLETS
ABSTRACT
Head-on collision of droplets consisting of different liquids for a wide range of Weber numbers between 25 and 430 is studied numerically using the volume of fluid (VOF) methodology and by adopting an axisymmetric approximation. An adaptive local grid refinement technique is used to capture with precision the liquid-air interface at significantly reduced computational cost relative to a uniformly dense grid. The conditions setting the boundary between permanent coalescence and reflexive separation are defined; in addition, useful relationships determining the ligament’s elongation, the corresponding time of its breakup, the number of satellite droplets formed, the maximum droplet deformation, and the viscous dissipation coefficient are presented. Furthermore, the present study reveals the dependence of collision characteristics not only on Weber number, but also either on Reynolds, capillary, or Ohnesorge numbers.
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Strotos George, Aleksis George, Gavaises Manolis, Nikas Konstantinos-Stephen, Nikolopoulos Nikos, Theodorakakos Andreas, Non-dimensionalisation parameters for predicting the cooling effectiveness of droplets impinging on moderate temperature solid surfaces, International Journal of Thermal Sciences, 50, 5, 2011. Crossref
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Nikolopoulos N., Bergeles G., The effect of gas and liquid properties and droplet size ratio on the central collision between two unequal-size droplets in the reflexive regime, International Journal of Heat and Mass Transfer, 54, 1-3, 2011. Crossref
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Strotos George, Gavaises Manolis, Theodorakakos Andreas, Bergeles George, Numerical investigation of the evaporation of two-component droplets, Fuel, 90, 4, 2011. Crossref
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Nikolopoulos N., Strotos G., Nikas K.S., Bergeles G., The effect of Weber number on the central binary collision outcome between unequal-sized droplets, International Journal of Heat and Mass Transfer, 55, 7-8, 2012. Crossref
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Strotos George, Nikolopoulos Nikos, Nikas Konstantinos-Stephen, Moustris Kostas, Cooling effectiveness of droplets at low Weber numbers: Effect of temperature, International Journal of Thermal Sciences, 72, 2013. Crossref
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Qu Qiulin, Ge Chenhui, Liu Peiqing, Agarwal Ramesh K., Numerical Study of Radial Deformation and Energy Conversion in Head-on Collision of Two Equal-size Droplets, 55th AIAA Aerospace Sciences Meeting, 2017. Crossref
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Nishio Yu, Komori Kohei, Izawa Seiichiro, Fukunishi Yu, Simulation of collisions of two droplets containing two different liquids using incompressible smoothed particle hydrodynamics method, Theoretical and Computational Fluid Dynamics, 34, 1-2, 2020. Crossref