Topic
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.
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TL;DR: In this paper, the thermal Marangoni convection effects in magneto-Casson liquid flow through suspension of dust particles are considered and the transpiration cooling aspect is accounted.
Abstract: This paper deals with the thermal Marangoni convection effects in magneto-Casson liquid flow through suspension of dust particles. The transpiration cooling aspect is accounted. The surface tension is assumed to be fluctuating linearly with temperature. The fluid and dust particle’s temperature of the interface is chosen as a quadratic function of interface arc length. The governing problem is modelled by conservation laws of mass, momentum and energy for fluid and dust particle phase. Stretching transformation technique is utilized to form ordinary differential equations from the partial differential equations. Later, the numerical solutions based on Runge-Kutta-Fehlberg method are established. The momentum and heat transport distributions are focused on the outcome of distinct governing parameters. The results of Nusselt number is also presented and discussed. It is established that the heat transfer rate is higher in the case of dusty non-Newtonian fluid than dusty Newtonian fluid. The rate of heat transfer can be enhanced by suspending dust particles in a base liquid.
57 citations
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01 Aug 1970TL;DR: In this paper, the surface velocity field induced by the Marangoni effect is obtained experimentally for the steady dissolving of a low surface tension liquid at the free surface of a higher surface tension one.
Abstract: The surface velocity field induced by the Marangoni effect is obtained experimentally for the steady dissolving of a low surface tension liquid at the free surface of a higher surface tension one. Aliphatic alcohols C2C4 were used as the dissolving liquids, and water or aqueous solutions as the supporting liquids. The effects of surface tension and concentration differences as well as that of viscosity are examined. The experimental velocities are correlated as a function of the product Δ c( ∂ γ ∂c ) . Some qualitative explanations of the mechanism of the dissolving process under the action of surface forces are given.
57 citations
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TL;DR: In this paper, it was shown that the temperature required for bubble formation occurs above the boiling point of the surrounding liquid, in reasonable agreement with nucleation theories, and that surface tension effects can be very powerful, whereas normal thermal convection is negligible.
Abstract: Heating of absorbing particles in a liquid medium by an optical trapping beam may lead to bubble formation. Powerful currents, which we identify as due to Marangoni convection, can be observed in the vicinity. At the micron size scale such surface tension effects can be very powerful, whereas normal thermal convection is negligible. Similar effects cause bubbles to be attracted to regions of higher temperature, providing a very powerful means of trapping bubbles, which are repelled by optical forces in a Gaussian beam. Measurements of the temperature required for bubble formation show that it occurs above the boiling point of the surrounding liquid, in reasonable agreement with nucleation theories.
57 citations
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TL;DR: It is shown that the surface dynamics of active particle density can be determined using nonlocal 2D surface operators and that for both deep or shallow fluid layers this surface dynamics reduces to the 2D Keller-Segel model for the collective chemotactic aggregation of slime mold colonies.
Abstract: We study theoretically the collective dynamics of immotile particles bound to a 2D surface atop a 3D fluid layer. These particles are chemically active and produce a chemical concentration field that creates surface-tension gradients along the surface. The resultant Marangoni stresses create flows that carry the particles, possibly concentrating them. For a 3D diffusion-dominated concentration field and Stokesian fluid we show that the surface dynamics of active particle density can be determined using nonlocal 2D surface operators. Remarkably, we also show that for both deep or shallow fluid layers this surface dynamics reduces to the 2D Keller-Segel model for the collective chemotactic aggregation of slime mold colonies. Mathematical analysis has established that the Keller-Segel model can yield finite-time, finite-mass concentration singularities. We show that such singular behavior occurs in our finite-depth system, and study the associated 3D flow structures.
56 citations
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TL;DR: In this article, the primary and secondary instabilities for acetone as the working fluid with a Prandtl number of 4.44 were investigated in a geometry with equal aspect ratios in the range from 1 to 8 in both the direction along and perpendicular to the applied temperature gradient.
Abstract: The problem of buoyant-thermocapillary convection in cavities is governed by a relatively large number of nondimensional parameters, and there is consequently a large number of different types of flow that can be found in this system. Previous results give disjoint glimpses of a wide variety of qualitatively and quantitatively different results in widely different parts of parameter space. In this study, we report experiments on the primary and secondary instabilities for acetone as the working fluid with a Prandtl number of 4.44, and in a geometry with equal aspect ratios in the range from 1 to 8 in both the direction along and perpendicular to the applied temperature gradient. We thus complement previous work that mostly involved either fluid layers of large extent in both directions, or consisted of investigations of strictly two-dimensional disturbances. We investigate the qualitative and quantitative features of the fluid velocity field by flow visualization and particle tracking techniques. We obser...
56 citations