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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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Journal ArticleDOI
TL;DR: In this paper , an NAB/15-5 PH interface without cracks and lack of fusion was achieved, which was characterized with an interlayer of FexAl dendrites.
Abstract: Additive manufacturing (AM) of a nickel-aluminum-bronze (NAB)/15-5 PH multimaterial by laser-powder directed energy deposition (LP-DED) accomplished a combination of excellent mechanical performance and high corrosion resistance. An NAB/15-5 PH interface without cracks and lack of fusion was achieved, which was characterized with an interlayer of FexAl dendrites. The formation of the interfacial characteristics was attributed to a synthetic effect of liquid phase separation, Marangoni convection, and atom diffusion. A miscibility gap was generated by a high degree of supercooling in the melt pool, and 15-5 PH solidified prior to NAB to form a dendritic interlayer. Marangoni convection occurred to promote the Al atom diffusion from NAB to 15-5 PH, contributing to the formation of the FexAl phase at the interface. The multimaterial sample possessed higher ultimate tensile strength of 754.64 MPa in the transverse direction and 854.57 MPa in the longitudinal direction as compared to that of copper/steel counterparts fabricated by AM. The multimaterial printed by LP-DED exhibited different deformation mechanisms in the transverse and longitudinal directions. In the transverse direction, NAB contributed more deformation than 15-5 PH and determined the improved ductility of the multimaterial; in the longitudinal direction, the brittle FexAl dendrites constrained the deformation of NAB and 15-5 PH, which resulted in the early failure of the multimaterial. The multimaterial tended to undergo cracking at the interface of the FexAl and Cu phases under stress concentration, which was induced by their crystal incoherence.

39 citations

Journal ArticleDOI
TL;DR: In this paper, a sessile droplet with a constant contact angle mode on a heated substrate was investigated through a series of experiments and the quasi-steady state flower-like patterns of Benard-Marangoni instabilities were observed, which uniformly distributed along the azimuthal direction of droplet.

39 citations

Journal ArticleDOI
TL;DR: The threshold condition is given for the onset of a Korteweg\char21{}de Vries soliton as the result of an instability triggered by the Marangoni effect, i.e., by the variation of the interfacial tension with temperature or concentration of a surfactant.
Abstract: For a two-dimensional shallow liquid layer open to air and subjected to a thermal gradient (B\'enard problem), the threshold condition is given for the onset of a Korteweg\char21{}de Vries soliton as the result of an instability triggered by the Marangoni effect, i.e., by the variation of the interfacial tension with temperature or concentration of a surfactant. In the absence of buoyancy, in contrast with B\'enard convection, the heating for standard liquids must be done from the air side. However, for liquids exhibiting a minimum in surface tension with temperature the heating can also be done from the liquid side when operating past the minimum where the surface-tension coefficient increases with temperature.

39 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the influence of the thermocapillary flow on the morphology and the evolution of unstable two-layer films and showed that the film instability leads typically to formation of droplets driven by the flow.
Abstract: The decomposition of a laterally heated two-layer film caused by intermolecular forces is considered. Long-wave nonlinear equations, which incorporate thermocapillary flows and the influence of the van der Waals forces, are derived. The main stages of the three-dimensional evolution of films are presented. The influence of the thermocapillary flow on the morphology and the evolution of unstable two-layer films is investigated. It is shown that the film instability leads typically to formation of droplets driven by the thermocapillary flow. Anisotropic coalescence of droplets and formation of rivulets are observed.

39 citations

Journal ArticleDOI
TL;DR: The emergence of an oscillatory mode in the case of heating from below and stable patterns with finite-amplitude surface deformation are shown in this system for the first time.
Abstract: We consider long-wave Marangoni convection in a liquid layer atop a substrate of low thermal conductivity, heated from below.We demonstrate that the critical perturbations are materialized at the wave number K ∼ √Bi, where Bi is the Biot number which characterizes the weak heat flux from the free surface. In addition to the conventional monotonic mode, a novel oscillatory mode is found. Applying the K ∼ √Bi scaling, we derivea new set of amplitude equations. Pattern selection on square and hexagonal lattices shows that supercritical branching is possible. A large variety of stable patterns is found for both modes of instability. Finite-amplitude one-dimensional solutions of the set, corresponding to either steady or traveling rolls, are studied numerically; a complicated sequence of bifurcations is found in the former case. The emergence of an oscillatory mode in the case of heating from below and stable patterns with finite-amplitude surface deformation are shown in this system for the first time.

39 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023212
2022421
2021289
2020283
2019217
2018247