Modelling of miscible liquids with the Korteweg stress
Kostin, Ilya1 ; Marion, Martine ; Texier-Picard, Rozenn ; Volpert, Vitaly A.
1 Université de Saint-Etienne, Équipe d’Analyse Numérique, 23 rue Paul MICHELON, 42023 Saint-Etienne Cedex 02, France;
ESAIM: Modélisation mathématique et analyse numérique, Tome 37 (2003) no. 5, pp. 741-753.

When two miscible fluids, such as glycerol (glycerin) and water, are brought in contact, they immediately diffuse in each other. However if the diffusion is sufficiently slow, large concentration gradients exist during some time. They can lead to the appearance of an “effective interfacial tension”. To study these phenomena we use the mathematical model consisting of the diffusion equation with convective terms and of the Navier-Stokes equations with the Korteweg stress. We prove the global existence and uniqueness of the solution for the associated initial-boundary value problem in a two-dimensional bounded domain. We study the longtime behavior of the solution and show that it converges to the uniform composition distribution with zero velocity field. We also present numerical simulations of miscible drops and show how transient interfacial phenomena can change their shape.

DOI : 10.1051/m2an:2003042
Classification : 35K50, 76D05
Mots-clés : miscible liquids, Korteweg stress, drops
Kostin, Ilya 1 ; Marion, Martine  ; Texier-Picard, Rozenn  ; Volpert, Vitaly A. 

1 Université de Saint-Etienne, Équipe d’Analyse Numérique, 23 rue Paul MICHELON, 42023 Saint-Etienne Cedex 02, France; 
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Kostin, Ilya; Marion, Martine; Texier-Picard, Rozenn; Volpert, Vitaly A. Modelling of miscible liquids with the Korteweg stress. ESAIM: Modélisation mathématique et analyse numérique, Tome 37 (2003) no. 5, pp. 741-753. doi : 10.1051/m2an:2003042. http://archive.numdam.org/articles/10.1051/m2an:2003042/

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