Numerical Simulation of 3D Unsteady Heat Transfer at Strongly Deformed Droplets at High Reynolds Numbers

Matthias Hase () and Bernhard Weigand
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Matthias Hase: University of Stuttgart, Institute of Aerospace Thermodynamics
Bernhard Weigand: University of Stuttgart, Institute of Aerospace Thermodynamics

A chapter in High Performance Computing in Science and Engineering ’03, 2003, pp 255-266 from Springer

Abstract: Summary The dependency of the heat transfer on an initial deformation of droplets has been investigated at high droplet Reynolds numbers. The two-phase flow has been computed with an inhouse 3D DNS program (FS3D) using the Volume-of-Fluid method. For the droplets initial prolate and oblate shapes with an axial approaching flow has been studied. In addition, a spherical shape has been used as reference. The initial droplet Reynolds number for the present study has been Re 0 = 660 for all investigated cases. Due to the fact that the steady droplet velocity for the considered droplets has been much lower than the initial velocity of the droplets, the droplet velocity is decreased during the simulation. To gain more knowledge about the influence of deformation on the heat transfer, the time dependent, spatial averaged Nusselt number Nu t and the time and spatial averaged Nusselt number Nu m has been matched by the temperature and velocity field around a deformed droplet. By this comparison the oscillation phase with the largest heat transfer has been observed. The simulations have been performed on the Cray T3E/512-900 at the HLRS with 32 processors. The parallel performance in dependency of the number of processors has been investigated.

Keywords: Heat Transfer; Nusselt Number; Average Nusselt Number; High Heat Transfer; Droplet Velocity (search for similar items in EconPapers)
Date: 2003
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-642-55876-4_19

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DOI: 10.1007/978-3-642-55876-4_19

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