Abstract
Natural convection is the main mechanism of heat transfer in many natural and technological processes, which makes it urgent to study the possibilities of controlling it. In this work, the processes of development and damping of thermal convection in a flat vertical quasi-two-dimensional layer of magnetic nanofluid are considered experimentally. The presence of the magnetic properties of the nanofluid makes it possible to effectively apply the external magnetic fields to regulate convective heat transfer. The magnetic nanofluid layer was heated from below. It was shown in this work that the imposition of an external uniform stationary magnetic field perpendicular to the temperature gradient leads to the suppression of convection. The processes of heating and cooling the metal plates in a magnetic nanofluid are studied. It is demonstrated that the suppression of convection by a magnetic field leads to a slowdown in the heating of cold and cooling of hot metal plates in a magnetic nanofluid. The obtained results can be considered as a model for understanding similar exchange processes in liquids under the action of magnetic field.
Highlights
In many cases, encountered in natural conditions or in engineering, the main mechanism of heat transfer is natural convection
One interesting direction in these studies is the influence of an external magnetic field on thermal convection in a liquid
It was observed that when the bottom plate is heated by an electric current of a strength higher than athat certain critical development is taking
Summary
In many cases, encountered in natural conditions or in engineering, the main mechanism of heat transfer is natural convection. The regularities of thermal convection in liquids have been intensively studied, both experimentally and theoretically, for many years. One interesting direction in these studies is the influence of an external magnetic field on thermal convection in a liquid. The basic statement of the problem, in this case, is to consider the establishment of the thermal instability of a flat horizontal layer of a liquid heated from below. The influence of the imposed external magnetic field, in the case of a layer of electrically conducting liquid, was first considered theoretically in [1] and experimentally in [2]. The principal result of these studies was to establish that the critical
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