scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors review the existing literature and give a survey of the recent work on bubble formation and its occurrence and distribution in shaped sapphire single crystals and propose a mechanism for bubble formation.

35 citations

Journal ArticleDOI
TL;DR: In this paper, the relation between the surface tension gradient and the resulting surface expansion rate is theoretically analyzed and experimental results are discussed in the perspective of theoretical treatment, using an adapted differential laser Doppler method which is successfully applied to the overflowing cylinder technique.

35 citations

Journal ArticleDOI
TL;DR: In this article, temperature fluctuations in a half-zone liquid bridge of molten silicon were measured under precisely controlled oxygen partial pressure in the ambient atmosphere, and a transition from a mode with non-periodic fluctuations in temperature to one with periodic fluctuations occurred when the oxygen Partial Pressure at the inlet was increased from 3.5×10−7 to 1.8× 10−5−MPa.

35 citations

Journal ArticleDOI
TL;DR: In this paper, a two-dimensional (2D) model of the Marangoni effect in a one-liquid floating zone is presented, where a concave and a convex cold disk were designed and realized for the DI mission together with two hot disks.
Abstract: T he experiment on Marangoni flows was designed to continue the investigation performed during the first Spacelab mission (SL1), namely to study surface-driven convection phenomena under microgravity conditions to exploit the unique environment offered by space laboratories. In fact, on earth free convection is mostly caused by buoyancy forces that generally "mask" all the others, while in space such forces may not be the governing ones and free convective flows may be induced by other forces. In the case of liquid systems presenting fluid-fluid interface, one of these forces is the surface tension gradient and the corresponding convective flow is the well-known Marangoni effect. The scientific objectives of the D1 experiment include the qualitative and quantitative extension of the studies related to the SL1 and the investigation of new phenomenologies essentially concerned with the formation of a two-liquid floating zone. Once the SL1 experiment was performed, together with other experiments, both under microgravity conditions (on board sounding rocket and airplane) and on ground (at the Microgravity Laboratory of the Institute Umberto Nobile), the objectives of the DI experiment were defined; they can be summarized as follows: Study of thermal Marangoni flows in a one-liquid floating zone. Study of thermal and/or solutal Marangoni flows in a two-liquid floating zone. For each of the previous cases, analysis of the effects of some parameters, such as geometry of the supporting disks, imposed temperature differences, heating modalities, shape of the liquid-gas interfaces and breaking and reforming of the liquid bridge, was performed. With respect to the first objective, the D1 experiment was intended to increase the ranges of the values of the relevant parameters with respect to the SLI experiment; such increases can be obtained, for example, in the case of the conditional Peclet number Peu, by forming liquid bridges with different volumes, aspect ratios (length divided by diameter of the supporting disk) and shapes, or by temperature differences and/or disk rotational velocities. According to the third objective, it was intended to analyze the effects of parameters (new with respect to the SLI experiment and never considered before), such as the shape of the supporting disks and the heat flux distribution over the heating disk. In particular, a concave and a convex cold disk were designed and realized for the DI mission together with two hot disks characterized, respectively, by a radial and an azimuthal distribution of temperature (however, time limitation allowed the use in space of only the concave and the radially heated disks). The reason for such boundary conditions was the need to better simulate the real configuration of the molten zone during a typical floating zone process. With respect to the two-liquid floating zone, the experiment was intended to analyze the effects of the presence of a liquid-liquid interface. The relevance of such a configuration comes from the possibility of studying many interesting fluid phenomena: from the dynamics of different surface phases to the dynamics of three-phase confluent lines, to the solutal Marangoni effects, to mass diffusion and its interaction with the Marangoni effect as in miscible liquids.

35 citations

Journal ArticleDOI
TL;DR: This work investigates the dynamics of a thin liquid film on an inclined planar substrate in the presence of an insoluble surfactant on its free surface through both the linear and nonlinear regimes.
Abstract: We investigate the dynamics of a thin liquid film on an inclined planar substrate in the presence of an insoluble surfactant on its free surface. We consider both the linear and nonlinear regimes. The linear regime is examined through the Orr-Sommerfeld eigenvalue problem of the full Navier-Stokes and concentration equations and wall and free-surface boundary conditions. The nonlinear regime is investigated through two different models. The first one is obtained from the classical long-wave expansion and the second one through an integral-boundary-layer approximation combined with a simple Galerkin projection. Although accurate close to the instability threshold, the first model fails to describe the dynamics of the system far from criticality. On the other hand, the second model not only captures accurately the behavior close to the instability threshold, but is also valid far from criticality. Analytical and numerical results on the role of the surfactant on the free-surface dynamics are presented. In the linear regime, the Marangoni stresses induced by the surfactant reduce the domain of instability for the base flow. In the nonlinear regime, the system evolves into solitary pulses for both the free surface and surfactant concentration. The amplitude and velocity of these pulses decrease as the Marangoni effect becomes stronger.

35 citations


Network Information
Related Topics (5)
Reynolds number
68.4K papers, 1.6M citations
88% related
Heat transfer
181.7K papers, 2.9M citations
84% related
Turbulence
112.1K papers, 2.7M citations
81% related
Nucleation
63.8K papers, 1.6M citations
80% related
Thermal conductivity
72.4K papers, 1.4M citations
79% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023212
2022421
2021289
2020283
2019217
2018247