Numerical Study of Mixed Convection and Heat Transfer in Arc-Shaped Cavity with Inner Heat Sources

The mixed convection and heat transfer in enclosures with inner heat sources widely exist in building ventilation, cooling of nuclear reactors and cooling of electronic components. In this study, the heat transfer characteristics of mixed convection in an open arc-shaped cavity with double heat sources under the condition of bottom heating and top wall cooling are studied by two-dimensional numerical simulation using ANSYS FLUENT. The influence of the Reynolds number on flow structures, transient characteristics and heat transfer characteristics in the arc cavity was studied by changing inlet wind speed. As the Reynolds number changes from 2.19 x 10(5) to 4.38 x 10(7), the flow in the fully developed stage will evolve from turbulent flow to periodic flow and then to steady state flow. In this study, the critical Reynolds number intervals for three different flow states are given. The increase in the Reynolds number enhances the heat convection in the cavity. The difference between heat convection and heat conduction is increased, which has a linear relationship with the Reynolds number. As the Reynolds number increases, the heat removal capacity in the middle region of the double heat sources is not always enhanced, which is due to the sudden change in flow structure and flow state around Re = 1.18 x 10(7).

Automated summary

In this study, the heat transfer characteristics of mixed convection in an open arc-shaped cavity with double heat sources were investigated using two-dimensional numerical simulation. The Reynolds number was varied by changing the inlet wind speed to study its influence on flow structures, transient characteristics, and heat transfer characteristics in the arc cavity. It was found that as the Reynolds number increased from 2.19 x 10(5) to 4.38 x 10(7), the flow evolved from turbulent flow to periodic flow and then to steady state flow. The critical Reynolds number intervals for different flow states were determined. The increase in Reynolds number enhanced heat convection in the cavity and increased the difference between heat convection and heat conduction in a linear relationship. However, the heat removal capacity in the middle region of the double heat sources was not always enhanced as the Reynolds number increased, due to the sudden change in flow structure and flow state around Re = 1.18 x 10(7).