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The Influence of Surfactants on Thermocapillary Flow Instabilities in Low Prandtl Melting Pools

The Influence of Surfactants on Thermocapillary Flow Instabilities in Low Prandtl Melting Pools, Anton Kidess, Sasa Kenjeres, and Chris R. Kleijn. Physics of Fluids 2016, 28  (6), 062106.

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Abstract

Flows in low Prandtl number liquid pools are relevant for various technical applications and have so far only been investigated for the case of pure fluids, i.e., with a constant, negative surface tension temperature coefficient partial derivative gamma/partial derivative T. Real-world fluids containing surfactants have a temperature dependent partial derivative gamma/partial derivative T > 0, which may change sign to partial derivative gamma/partial derivative T < 0 at a critical temperature T-c. Where thermocapillary forces are the main driving force, this can have a tremendous effect on the resulting flow patterns and the associated heat transfer. Here we investigate the stability of such flows for five Marangoni numbers in the range of 2.1 x 10(6) <= Ma <= 3.4 x 10(7) using dynamic large eddy simulations, which we validate against a high resolution direct numerical simulation. We find that the five cases span all flow regimes, i.e., stable laminar flow at Ma <= 2.1 x 10(6), transitional flow with rotational instabilities at Ma <= 2.8 x 10(6) and Ma = 4.6 x 10(6), and turbulent flow at Ma = 1.8 x 10(7) and Ma = 3.4 x 10(7). Published by AIP Publishing.

BibTeX

@article{ ISI:000379040200016,
Author = {Kidess, Anton and Kenjeres, Sasa and Kleijn, Chris R.},
Title = {The Influence of Surfactants on Thermocapillary Flow Instabilities in Low Prandtl Melting Pools},
Journal = {Physics of Fluids},
Year = {2016},
Volume = {28},
Number = {6},
Month = {},
Abstract = {Flows in low Prandtl number liquid pools are relevant for various technical applications and have so far only been investigated for the case of pure fluids, i.e., with a constant, negative surface tension temperature coefficient partial derivative gamma/partial derivative T. Real-world fluids containing surfactants have a temperature dependent partial derivative gamma/partial derivative T > 0, which may change sign to partial derivative gamma/partial derivative T < 0 at a critical temperature T-c. Where thermocapillary forces are the main driving force, this can have a tremendous effect on the resulting flow patterns and the associated heat transfer. Here we investigate the stability of such flows for five Marangoni numbers in the range of 2.1 x 10(6) <= Ma <= 3.4 x 10(7) using dynamic large eddy simulations, which we validate against a high resolution direct numerical simulation. We find that the five cases span all flow regimes, i.e., stable laminar flow at Ma <= 2.1 x 10(6), transitional flow with rotational instabilities at Ma <= 2.8 x 10(6) and Ma = 4.6 x 10(6), and turbulent flow at Ma = 1.8 x 10(7) and Ma = 3.4 x 10(7). Published by AIP Publishing.},
DOI = {10.1063/1.4953797},
Pages = {062106},
ISSN = {1070-6631},
EISSN = {1089-7666},
Unique-ID = {ISI:000379040200016},
}

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