The combined effects of shear and buoyancy on phase boundary stability

Toppaladoddi, S.Univ Oxford, Oxford OX2 6GG, England.;Yale Univ, New Haven, CT 06520 USA. (författare)

QC 20190513
We study the effects of externally imposed shear and buoyancy driven flows on the stability of a solid-liquid interface. A linear stability analysis of shear and buoyancy-driven flow of a melt over its solid phase shows that buoyancy is the only destabilizing factor and that the regime of shear flow here, by inhibiting vertical motions and hence the upward heat flux, stabilizes the system. It is also shown that all perturbations to the solid-liquid interface decay at a very modest shear flow strength. However, at much larger shear-flow strength, where flow instabilities coupled with buoyancy might enhance vertical motions, a re-entrant instability may arise.

Wettlaufer, JohnStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),University of Oxford, UK; Yale University, USA(Swepub:su)jw (författare)
Univ Oxford, Oxford OX2 6GG, England.;Yale Univ, New Haven, CT 06520 USA.Nordic Institute for Theoretical Physics NORDITA (creator_code:org_t)

Ingår i:Journal of Fluid Mechanics: CAMBRIDGE UNIV PRESS868, s. 648-6650022-11201469-7645

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