Flow instabilities and reversals in non-uniformly thermocapillary driven melt pool

Kidess, A.; Kenjeres, S.; Kleijn, C.R.

Flow instabilities and reversals in non-uniformly thermocapillary driven melt pool

Conference paper (2015)

Authors

A. Kidess

S. Kenjeres

C.R. Kleijn

Department

Chemical Engineering

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Published Date

28-08-2015

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Source:

15th European Turbulence Conference 2015 (ETC15), August 25-28th, 2015, Delft, The Netherlands

Faculty

Applied Sciences

Department

Chemical Engineering

Abstract

With transient LES and DNS simulations, we investigate flow in melt pools driven by thermocapillary forces. The developing pool is at first axisymmetric as are the boundary conditions, but flow instabilities arise that lead to 3D oscillatory flow patterns. At higher laser powers a sign-change in the surface tension temperature coefficient occurs, resulting in a flow reversal in the pool and thus two counter-rotating vortices, which exhibit similar though more complex flow instabilities.

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