A simple model of viscous propulsion a two-dimensional Marangoni boat caused by surface diffusion and sublimation (reaction) insoluble surfactant is formulated studied analytically. The speed the determined explicitly as function Damkohler number fully resolving Marangoni-induced bulk flow release surfactants onto semi-infinite fluid. complementary general integral formula for also derived usin...

While the Marangoni-stress-driven spreading of surfactants along continuous fluid interfaces is a well-studied problem, we demonstrate experimentally that swift and efficient surfactant transport can also occur along discontinuous interfaces. We used chemical surface patterning to create arrays of discrete drops and liquid bridges immersed inside a second immiscible liquid. Surface-active compo...

Marangoni and thermocapillary driven systems represent two classes of flows in which the variation in surface tension at the gas-liquid interface can generate spontaneously spreading films. This article considers the linear stability of such flows within the lubrication approximation. Since the base state or unperturbed solutions in both cases involve spatially inhomogeneous profiles, the linea...

Bubble and droplet motion in binary mixtures is studied in weak heat and diffusion fluxes and in gravity by solving the linearized hydrodynamic equations supplemented with appropriate surface boundary conditions. Without gravity, the velocity field is induced by evaporation and condensation at the interface and by the Marangoni effect due to a surface-tension gradient. In pure fluids, the latte...

In this work, it is demonstrated that the existence and topology of the recently observed interfacial singularities driven by Marangoni effects can be deduced using mean-curvature flow theory extended to account for variations of interfacial tension. This suggests that some of the physical mechanisms underlying the formation of these interfacial singularities may originate from/be modeled by th...

The coupled momenta induced by thermal effects near interfaces cause complex three-dimensional flow structures, called thermocapillary or Marangoni convection. Thermocapillary convection is crucial for crystal growth quality, and the mainstream method used to study half-zone liquid bridge model. This paper designs a gas–liquid two-phase system reports numerical results on instability associated...

The stability analysis of Marangoni convection in porous media with a deformable upper free surface is investigated. The linear stability theory and the normal mode analysis are applied and the resulting eigenvalue problem is solved exactly. The Darcy law and the Brinkman model are used to describe the flow in the porous medium heated from below. The effect of the Crispation number, Bond number...

This article is devoted to the investigation of Marangoni-driven pattern formation at the interface between two immiscible fluids filling a Hele-Shaw cell, each of them containing a reactant of an exothermic neutralization reaction. In such a system, convective patterns arise when one reactant diffuses through the interface to react with the other chemical species in one of the fluids. A chemo-...

Due to lack of comprehensive experimental studies on welding processes, and to better understand the mechanisms behind these processes, especially the weld pool shape variations suspected due to Marangoni Effect or surface tension shear stress, a two-dimensional simulation model was developed to study the physics of gas tungsten arc welding (GTAW). Experimental spot-welds on Ti-5Al-5Mo-5V-3Cr w...