natural convection

In this study, the effects of fluid-solid interaction with an elastic rubber baffle in an inclined cavity were modelled numerically. In the upper and lower walls of the insulated chamber, the left wall is hot and the right wall is cold. The goal of the present research was to investigate the rate of heat transfer from the hot wall by calculating the Nusselt number and the von Mises stress at the root of the baffle at different slopes of the cavity. For this purpose, the solution geometry was modelled in the workbench software environment. k-ɛ method was used to solve the turbulent displacement flow (Ra>107). First, the effect of the presence of an elastic baffle compared to a rigid baffle was investigated. The values of the Nusselt number as the heat transfer rate from the hot wall for the elastic Baffle were 5% higher than the rigid Baffle. Then, the effect of the Inclined Cavity on the heat transfer rate, Nusselt number and von Mises stress in the root of the baffle was investigated. The heat transfer in the hot wall increased by approximately 4% with an increase in the slope of the cavity from a=0.01 to a=0.035. The maximum Nusselt number was obtained at slope a=0.035, and its maximum value was 40. It was also observed that the von Mises stress in the vane root in the cavity with a slope of a=0.035 was 40% higher than the von Mises stress in the vane root in the cavity with a slope of a=0.01. The Von Mises stress value of the root of the baffle underwent severe fluctuations tending towards a constant number and reaching a steady state after a few seconds.

In the present study, the thermal behavior of fluid in a square enclosure with two semi-circular constantis investigated numerically. The governing equations are solved by FlexPDE software, which is a simulation software base on the finite element method. The results showed that the distance between the two heaters will be a parameter affecting heat transfer; By reducing this distance, the natural convection heat transfer that is limited to the central part of the channel, is in the form of a symmetrical vertical column. Increasing the Hartmann number will lead to an increase in Lorentz force, a decrease in buoyancy force and consequently a decrease in temperature, a symmetrical temperature distribution and a predominance of conductive heat transfer. Increasing the Riley number increases the natural convection heat transfer in the form of free displacement, and by increasing the Riley number, the free-moving heat transfer will completely dominate the chamber.