On mechanism of large-scale transfer of molten metal components in non-uniformly heated thin capillaries

Authors

  • Виталий Анатольевич Демин (Vitaliy Demin) Perm State University
  • Максим Иванович Петухов (Maxim Petukhov) Perm State University

DOI:

https://doi.org/10.17072/1994-3598-2016-3-65-71

Abstract

The results of numerical simulation for concentration-induced convection have been presented in this paper. Two-component melt of both liquid metals filling vertical thin capillary with non-uniform temperature distribution on the boundaries is considered. It is assumed that the condition of absolute nonwetting takes place on the sidewalls. Because of this effect there is a free surface on vertical boundaries, where thermocapillary force is appeared due to the external longitudinal temperature gradient which makes to move liquid elements at a big distance, compared with axial size of capillary. Processes of adsorption-desorption on a surface, thermocapillary force, motion in a volume and diffusion are characterized by essentially different times. These mechanisms generate a large-scale process of circulation as carrying-out of admixture on the surface in the hot higher part of capillary, its following transfer down along the boundary due to thermocapillary force and its return in the volume over the desorption in the lower part of capillary. The numerical calculations by the method of finite differences show that the lifting speed of returning motion in the volume is less, than on the surface, that’s why admixture in the stage of saturation can be accumulated nearby the lower part of capillary. After establishing the flow is stationary and determined as in the volume as on the surface by the Marangony number. Intensity of motion and processes of adsorption-desorption on the free boundary have the decisive influence upon the formation of surface and volume concentration fields and speed of redistribution of components in a mixture. Thus, one of the possible mechanisms of longitudinal division on components of liquid binary mixtures in thin channels has been demonstrated. This can explain the results of certain experiments with fusible metals on segregation of molten metal mixes.Received 17.10.2016; accepted 03.12.2016

Author Biographies

Виталий Анатольевич Демин (Vitaliy Demin), Perm State University

Head of the Theoretical physics department

Максим Иванович Петухов (Maxim Petukhov), Perm State University

PhD student

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Published

2017-03-04

How to Cite

Демин (Vitaliy Demin) В. А., & Петухов (Maxim Petukhov) М. И. (2017). On mechanism of large-scale transfer of molten metal components in non-uniformly heated thin capillaries. Bulletin of Perm University. Physics, (3(34). https://doi.org/10.17072/1994-3598-2016-3-65-71

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Regular articles

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