Journal ArticleDOI
Combined Residual Natural and Marangoni Convection in a Liquid Sphere Subjected to a Constant and Variable Micro‐Gravity Field
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The combined effect of thermal Marangoni convection induced by a gradient of temperature imposed upon the free surface of a liquid sphere and the residual natural convection steming from the still existing micro-gravity field in an orbiting space laboratory has been investigated in this article.Abstract:
The combined effect of thermal Marangoni convection induced by a gradient of temperature imposed upon the free surface of a liquid sphere and the residual natural convection steming from the still existing micro-gravity field in an orbiting space laboratory has been investigated The case of a constant and linearly dependent axial residual gravity field has been considered, for which the Stokes equation in the approximation of Boussinesq have been solved By the introduction of a dynamic Bond-number derived as the ratio of the Grashof number to the Reynoldsnumber based upon the Marangoni flow the predominance of Marangoni- (for Bo 0) or natural convection (for Bo ∞) could be determined Streamlines, radial- and angular velocity distributions have been obtained analytically The combined effect of Marangoni- and natural convection is of importance for space processings In addition the isothermal lines are presented for various imposed temperature distributions at the free surface of the liquid sphere
Es wird das Zusammenwirken thermischer Marangonikonvektion und der von der Restschwere in einem Weltraumlabor herruhrenden naturlichen Residualkonvektion in einer Flussigkeitskugel bestimmt Dabei wird die Oberflache der Kugel (Schmelze) einer axialsymmetrischen Temperatur ausgesetzt und in einem konstanten und linear variablen Mikrogravitationsfeld behandelt Stromfunktion und Geschwindigkeitsverteilung werden aus der Stokesgleichung in der Approximation von Boussinesq analytisch gelost Der Einflus des Residualschwerefeldes im Raumfluglabor wird durch das Einfuhren der dynamischen Bondzahl angegeben, wobei diese aus dem Verhaltnis der Grashofzahl zur Reynoldszahl, welche auf der Marangonikonvektion basiert, abgeleitet wird Fur verschwindende Bondzahlen dominiert die Marangonikonvektion, wahrend fur sehr grose Bondzahlen die naturliche Konvektion vorherrscht Fur lineare und quadratische Temperaturverteilungen werden die Stromlinien numerisch bestimmtread more
Citations
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Book
Liquid Sloshing Dynamics
TL;DR: In this article, the authors present a detailed review of liquid sloshing dynamics in rigid containers, including linear forced and non-linear interaction under external and parametric excitations.
Book ChapterDOI
Liquid Sloshing Dynamics: Fluid field equations and modal analysis in rigid containers
TL;DR: In this paper, the Dirichlet boundary conditions are classified into three classes: Neumann boundary conditions, Cauchy boundary conditions and Cauchey boundary conditions for a partially filled container.
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The effect of fluid flow on the solidification of Ni2B from the undercooled melt
TL;DR: In this article, the effect of fluid flow on the growth dynamics during solidification of tetragonal Ni2B from the undercooled melt was studied. And the authors demonstrated that fluid flow has a substantial influence on the growing kinetics, mainly attributed to a convection induced transition from dendrites to more faceted solidification structures.
References
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Journal ArticleDOI
Surface- and interface oscillations of freely floating spheres of immiscible viscous liquids
TL;DR: In this article, the natural damped axisymmetric frequencies for an arrangement of immiscible liquids of different density, viscosity and exhibiting surface-and interfacial tension were determined.
Journal ArticleDOI
Oscillations of immiscible liquids in free space or in spherical containers in zero-gravity environment
TL;DR: In this paper, the natural coupled frequencies for an arrangement of immiscible incompressible and frictionless liquids with surface and interfacial tension were determined for a system in the state of zerogravity and consisting either of liquid globules or liquids in a spherical container.
Journal ArticleDOI
Marangoni-convection in a freely floating liquid sphere due to axial temperature field
TL;DR: In this paper, a freely floating liquid drop is subjected at its surface to an axial temperature field inducing a thermal Marangoni-convection due to the variation of the surface tension.
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