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1995-02

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/24896

Cavity flow induced by a fluctuating acceleration field

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Recurs relacionat

http://doi.org/10.1063/1.868627

Resum

Buoyancy driven convection induced by a fluctuating acceleration field is studied in a two dimensional square cavity. This is a simplified model of, for example, fluid flow in a directional solidification cell subject to external accelerations, such as those encountered in a typical microgravity environment (g‐jitter). The effect of both deterministic and stochastic acceleration modulations normal to the initial density gradient are considered. In the latter case, the acceleration field is modeled by narrow band noise defined by a characteristic frequency Ω, a correlation time τ, and an intensity G2. If the fluid is quiescent at t=0 when the acceleration field is initiated, the ensemble average of the vorticity at the center of the cavity remains zero for all times. The mean squared vorticity 〈ξ2〉, however, is seen to exhibit two distinct regimes: For t≪τ, 〈ξ2〉 oscillates in time with frequency Ω. For t≫τ, 〈ξ2〉 grows linearly in time with an amplitude equal to R2Pr/(1+(Ωτ))2, where R is a new dimensionles...

Matèries

Creixement cristal·lí, Ambients de microgravetat, Ciència dels materials, Semiconductors, Mecànica de fluids

Matèries (anglès)

Crystal growth, Reduced gravity environments, Materials science, Semiconductors, Fluid mechanics

Citació

Col·leccions

Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

THOMSON, J. Ross, CASADEMUNT I VIADER, Jaume and VIÑALS GIMÉNEZ, Jorge. Cavity flow induced by a fluctuating acceleration field. Physics of Fluids. 1995. Vol. 7, num. 2, pags. 292-301. ISSN 0021-8979. [consulted: 4 of August of 2026]. Available at: https://hdl.handle.net/2445/24896

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