The natural convection heat transfer is investigated in the cavities filled with two immiscible fluids of sulfuric acid-water (25-75%) and air with different profiles of heat flux from side walls. The heatline visualization approach is employed to detect the heat energy path in the cavity from heat sources to heat sinks. The operating fluid is sulfuric acid-water (25-75%) at the bottom region and air at the top of the cavity. The Navier-Stokes equations are solved based on two-dimensional form, and finite volume approach is utilized. The side walls are heated variable heat flux and no-slip condition is applied to them. The top and bottom walls are cooled by environment temperature with no-slip condition.
The natural convection heat transfer is investigated in the cavities filled with two immiscible fluids of sulfuric acidwater (25-75%) and air with different profiles of heat flux from side walls. The heatline visualization approach is employed to detect the heat energy path in the cavity from heat sources to heat sinks. The operating fluid is sulfuric acid-water (25-75%) at the bottom region and air at the top of the cavity. The Navier-Stokes equations are solved based on two-dimensional form, and finite volume approach is utilized. The side walls are heated variable heat flux and no-slip condition is applied to them. The top and bottom walls are cooled by environment temperature with no-slip condition. The influences of different governing parameters of Rayleigh number (〖10〗^3