On convective instability of a suspension in the Hele–Shaw cell

Authors

  • Иван Николаевич Черепанов (Ivan Cherepanov) Perm State University

DOI:

https://doi.org/10.17072/1994-3598-2016-3-72-78

Abstract

The article is devoted to the influence of sedimentation and thermal diffusion on threshold of convective instability of a suspension in the Hele-Shaw cell heated from below. Impurity distribution adjustment in colloid in a state of mechanical equilibrium is not uniform, due to the gravitational separation of the mixture. In the channels with the height much less than the sedimentation length, concentration gradient is almost constant. In this case, the ratio of the average impurity concentration to the sedimentation length determines the instability threshold. Mathematical model that describes the convective motion of the colloid, has been based on the Boussinesq approximation. The solution of the linearized system of equations has been performed using the Galerkin method with a large number of basic functions. During research, neutral instability curves are obtained for different values of the Boltzmann number. The influence of gravity stratification on the structure of near-threshold flows has been established. The dependence of the threshold of convective instability and the wave number are determined as a function of parameters of the problem, such as the Boltzmann number and the parameter of thermal diffusion.Received 31.10.2016; accepted 05.12.2016

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Published

2017-03-04

How to Cite

Черепанов (Ivan Cherepanov) И. Н. (2017). On convective instability of a suspension in the Hele–Shaw cell. Bulletin of Perm University. Physics, (3(34). https://doi.org/10.17072/1994-3598-2016-3-72-78

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