Özet:

Abstract Buoyancy-driven convection, commonly referred as conventional convection or Rayleigh convection, arises when a fluid is subjected to a temperature gradient in a gravitational field and there is a change in density and viscosity with regard to temperature. Unlike buoyancy-driven convection, Marangoni convection, also known as interfacial tension gradient-driven convection, can occur in a fluid even when no gravitational field exists. The suggested inquiry approach in this study is based on a natural convection analysis combined with a numerical examination of the effect of variable viscosity on Rayleigh-Benard Marangoni convection in a hydrodynamic surface. The effects of viscosity fluctuations in the Rayleigh-Benard-Marangoni convection process, which causes different physical changes, are taken as key objective to analyze. The relationship between viscosity and surface tension, the viscosity and buoyancy values are computed to find their dependence relationship, followed by the temperature dependence of variable viscosity of fluids with high and low molecular spacing. Finally, the density is related with the viscosity. As a result, the impacts of changing viscosity are accounted using the resulting equations to represent the Rayleigh number and Marangoni number effects. Convection are determined using microscopic fluid’s dynamic parameters, allowing for a better understanding of fluid dynamics under natural convection.

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