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The Effect of the Surface Inclination on the Hydrodynamics and Thermodynamics of Leidenfrost Droplets

Published online by Cambridge University Press:  13 March 2014

P. Pournaderi  and
A. R. Pishevar
P. Pournaderi*
Affiliation:
Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
A. R. Pishevar
Affiliation:
Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
*
s.pournaderi@me.iut.ac.ir, apishe@cc.iut.ac.ir
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Abstract

In this research, the effect of the surface inclination on the hydrodynamics and heat transfer of droplets impinging on very hot surfaces is studied. The applied numerical algorithm is based on the accurate calculation of the vaporization rate in the simulation process using a combination of the level set and ghost fluid methods. Also a mesh clustering technique is utilized to create sufficient mesh resolution near the surface in order to take into account the effect of the thin vapor layer between droplet and very hot surface. The results are verified against available experiments. The effect of the surface inclination on the droplet maximum spreading radius, droplet contact time and total heat removal from the surface is considered. Results show that for the studied regime, the maximum spreading radius of the droplet is decreased with an increase in the surface inclination while the droplet contact time on the surface is independent from the surface inclination. For inclinations greater than 45°, the total heat removal is decreased considerably with an increase in the inclination angle. For smaller inclinations, the dependency of the total heat removal on the surface inclination is not strong.

Keywords

Film boilingInclined surfaceDroplet impactLevel set
Type
Research Article
Information
Journal of Mechanics , Volume 30 , Issue 2 , April 2014 , pp. 145 - 151
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2014 

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References

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