Two-dimensional numerical simulations of Marangoni-Bénard instabilities during liquid-liquid mass transfer in a vertical gap


Two-dimensional numerical simulations of Marangoni-Bénard instabilities during liquid-liquid mass transfer in a vertical gap

Grahn, A.

2D simulations of isothermal liquid-liquid mass transfer subject to surface tension and buoyancy driven hydrodynamic instabilities have been carried out. Simulation is based on the numerical solution of two-dimensional equations of momentum and mass transport, using a combination of finite difference and finite volume methods. Two different cases have been considered: (1) buoyancy stable mass transfer, only surface tension driven convection occurs; (2) surface tension driven instability superseeded by buoyant convection. The faster attenuation of mass transfer coefficients in buoyancy stable situations is attributed to the merging of convection cells leading to a reduction in the number of renewal zones along the interface. Concentration profiles next to the interface reveal the diffusional nature of the mass transfer.

Keywords: Marangoni Instability; Rayleigh-Bénard Instability; Interfacial Convection; Mass Transfer; Momentum Transfer; Simulation

Permalink: https://www.hzdr.de/publications/Publ-7469
Publ.-Id: 7469