Stability of equilibrium and convective regimes of nanosuspension on the base of binary molecular medium

Authors

  • Александр Игоревич Меньшиков (Alexander Menshikov) Perm State University

DOI:

https://doi.org/10.17072/1994-3598-2017-2-33-39

Abstract

The stability of mechanical equilibrium of horizontal layer of nanosuspension on the base of binary molecular medium is investigated numerically. Convective system is subjected to the static gravity field. The linear stability is considered relatively to the normal neutral disturbances. The effects of thermal diffusion and sedimentation are taken into account over the calculations. The mathematical model of the problem is based on the system of the differential equations for the incompressible fluid in the Boussinesq approximation and permits to describe the convective stability. The behaviour of the neutral curves has been studied when the governing parameters of the problem are changed. The shooting technique in combination with Runge-Kutta-Feldberg method of numerical integration across the layer is applied to solve the spectral amplitude problem. It has been found that the main parameters of the problem are the Boltzmann number and the dimensionless thermal diffusion parameter. Non-monotonous behaviour of the critical Rayleigh number in dependence on Boltzmann number has been received in our model for whole range of governing parameters. Initially, when the Boltzmann number is increased the critical Rayleigh number decreases but further growth of this parameter is observed. It is also demonstrated that the change in Boltzmann number and thermodiffusion parameter makes the largest contribution to the change of the critical parameters. It is shown that the "inclusion" of these mechanisms leads to the broadening of the neutral curves, due to which a large variety of convective regimes in the field of small values of supercriticality are expected.

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Published

2017-10-23

How to Cite

Меньшиков (Alexander Menshikov) А. И. (2017). Stability of equilibrium and convective regimes of nanosuspension on the base of binary molecular medium. Bulletin of Perm University. Physics, (2(36). https://doi.org/10.17072/1994-3598-2017-2-33-39

Issue

Section

Regular articles