Marangoni effect

About: Marangoni effect is a research topic. Over the lifetime, 5336 publications have been published within this topic receiving 98562 citations. The topic is also known as: Gibbs–Marangoni effect.

Marangoni flows and corrosion of refractory walls

Abstract: Local corrosion of refractory at slaggas and slagmetal interfaces is caused by active motion of slag film formed by the wettability between the refractory and slag. In the systems of SiO2(s)(PbOSiO...

Influence of Welding Parameters and Shielding Gas Composition on GTA Weld Shape

Abstract: The interaction between the variable welding parameters and shielding gas composition in determining the weld shape in Ar-CO2 shielded gas tungsten arc (GTA) welding with SUS304 stainless steel is discussed. The GTA weld shape depends to a large extent on the pattern and strength of the Marangoni convection on the pool surface, which is controlled by the content of surface active element, oxygen, in the weld pool and the welding parameters. Results showed that oxygen absorption into the liquid pool during the welding process is sensitive to the CO2 concentration in the shielding gas. An inward Marangoni convection occurs on the pool surface when the oxygen content is over 100 ppm in the welding pool under Ar-0.3%CO2 shielding. A low oxygen content in weld pool changes the inward Marangoni convection to an outward direction under the Ar-0.1%CO2 shielding. The strength of the Marangoni convection on the liquid pool is a product of the temperature coefficient of the surface tension (dσ/dT) and the temperature gradient (dT/dr) on the pool surface. Different welding parameters will change the temperature distribution and gradient on the pool surface, and therefore, affect the strength of Marangoni convection and the weld shape.

Marangoni Driven Boundary Layer Flow of Carbon Nanotubes Toward a Riga Plate

Abstract: The objective of this article is to explore the radiative marangoni boundary layer flow on the existence of carbon nanotubes through a surface embedded is an electromagnetic actuator defined as a riga plate. To judge the performance of Lorentz forces on the bases of nanoparticles temperature fluxes, two different types of carbon nanotubes, namely single wall carbon nanotube and multi wall carbon nanotubes saturated into water used as base fluid. With the introduction of some viable dimensionless variables into the system of nonlinear partial differential equations, the resulting nonlinear designed flow of marangoni boundary layer flow over riga plate is developed. The proposed schemes of governing equations are then converted into ordinary differential equations by similarity transformation. To sort out characteristics of thermal radiation and effect of Hartmann number through marangoni boundary layer flow of nanofluid, some suitable boundary conditions are utilized. The solution of indicated governing equations and for the convergence of control parameters, one of best analytical method is utilized. The velocity and temperature profiles of various parameters are deliberated in detail for numerical significance. Numerical survey of embedded parameters is then depicted on graphs and tables. Finally, some accomplished comments are also our part of consultation.

Thermosolutal Marangoni Impact on Bioconvection in Suspension of Gyrotactic Microorganisms Over an Inclined Stretching Sheet

Abstract: Microorganism cells movement in the fluid is universal and affects many ecological and biological processes, including infection, reproduction, and marine life ecosystem. There are many biological and medical applications that require an understanding of the transport process in nanofluids containing a suspension of microorganism. The present problem deals with the bioconvection of Casson nanofluid containing a suspension of motile gyrotactic microorganisms over an inclined stretching sheet in the presence of thermal radiation, viscous dissipation, and chemical reaction and magnetic field. At the surface, the influence of the thermosolutal Marangoni convection and suction/injection impact are considered. The governing equations are solved numerically by using fourth-order Runge–Kutta–Fehlberg method with shooting technique. The impact of the major pertinent parameters on the velocity, temperature, nanoparticles concentration, and density of the motile microorganism is illustrated graphically. Finally, the correlations of various crucial parameters on skin friction, local Nusselt number, Sherwood number, and local motile microorganism density number are displayed through the graphs and tables.