This study treats an evaporating horizontal binary-liquid layer in contact with the air with an imposed transfer distance. The liquid is an aqueous solution of ethanol (10 % wt). Due to evaporation, the ethanol mass fraction can change and a cooling occurs at the liquid-gas interface. This can trigger solutal and thermal Rayleigh-Bénard-Marangoni instabilities in the system, the modes of which ...

Marangoni propulsion is a form of locomotion wherein an asymmetric release of surfactant by a body located at the surface of a liquid leads to its directed motion. We present in this paper a mathematical model for Marangoni propulsion in the viscous regime. We consider the case of a thin rigid circular disk placed at the surface of a viscous fluid and whose perimeter has a prescribed concentrat...

Different regimes of temperature modulated breakup were studied using a slender jet model. The instability is induced through capillary and Marangoni stresses can be used to control droplet formation in terms intact length resultant drop size distribution, which otherwise irregular due the inevitable presence background noise. When thermal modulation weak, surface tension gradient forces act on...

In this paper we use classical linear stability theory to investigate the effects of uniform internal heat generation on the onset of Marangoni convection in a horizontal layer of fluid heated from below. We use a analytical technique to obtain the close form analytical expression for the onset of Marangoni convection when the lower boundary is conducting with free-slip condition. We show that ...

We consider ow in a thin lm generated by partially submerging a rigid plate in a reservoir of ethanol-or methanol-water solutions and wetting its surface. Evaporation leads to concentration and surface tension gradients that drive ow up the plate. An experimental study indicates that the climbing lm is subject to two distinct instabilities. The rst is a convective instability characterized by a...

We describe experiments on Bénard-Marangoni convection which permit an useful understanding on the main concepts involved in this phenomenon as, for example, Bénard cells, aspect ratio, Rayleigh and Marangoni numbers, crispation number and critical conditions. In spite of the complexity of the convection theory, this work carries out a simple and introductory analysis of it which has the additi...

Rayleigh-Bénard-Marangoni instability in a bilayer system of self-rewetting fluid overlying porous medium is investigated. The upper surface the layer assumed non-deformable and constant temperature gradient imposed. Unlike previous works, considered this paper, whose tension quadratic function temperature. As result, it would reinforce or suppress caused by buoyancy different scenarios. Thorou...

The temporal stability of a two-layer plane Couette flow with an interfacial heat source/sink is studied, in the presence viscosity stratification, predicting unstable streamwise and spanwise perturbations. Based on wavenumber at onset, perturbations are further classified as long-wave finite-wave, where mode investigated using asymptotic numerical analyses. finite-wave instability expected to ...

It has long been known that deposited drops of surfactant solution induce Marangoni flows at air-liquid interfaces. These surfactant drops create a surface tension gradient, which causes an outward flow at the fluid interface. We show that aqueous phospholipid dispersions may be used for this same purpose. In aqueous dispersions, phospholipids aggregate into vesicles that are not surface-active...