Convection and Stratification of Temperature and Concentration

TL;DR

This paper investigates natural convection in a heated closed liquid region, revealing nonlinear flow behaviors, nonmonotonic temperature and concentration segregation, and effects of vibrations on oscillatory convection.

Contribution

It provides new insights into flow structure changes, segregation dependencies, and the impact of vibrations on convection in a closed system.

Findings

Nonmonotonic temperature and concentration segregation depend on flow intensity.

Formation of nonstationary periodic thermal convection structures.

Vertical and horizontal vibrations influence oscillatory convection patterns.

Abstract

The paper is devoted to the study of natural convection and the formation of delamination in an incompressible liquid due to convective laminar flows in a closed region heated from the side. Weak, medium and intensive modes of stationary laminar thermal, concentration and hemoconcentration (thermohaline) convection are considered, in which nonlinear flow features are manifested that can radically change the flow structure and characteristics of heat and mass transfer. Nonmonotonic dependences of temperature and concentration segregation in the center of the square region on the Grashof number (an intensity of flow) were found. The features of the formation of a nonstationary periodic structure of thermal convection in boundary layers and in the core of a convective flow in a closed region are shown. Details of the formation of countercurrents inside the region with the direction opposite to the main convective flow are given. The influence of vertical and horizontal vibrations on oscillatory convection is shown.