Numerical study of the influence of vortex generator on flow structure and heat transfer around a cube mounted in a channel

الملخص EN

Numerical Investigation of the influence of vortex generator on the enhancement of heat transfer from a wall mounted cube which placed in the middle of a rectangular channel have been conducted using finite–volume method.

The momentum and convective heat transfer equations were discretized and solve using large– eddy simulation (LES).

In order to study the influence of vortex generator on the flow structures and heat transfer coefficient, the flow which considered a fully developed turbulent flow and the convective heat transfer equations were solved around two cube configurations: a smooth cube and a cube with vortex generator attached to its surface.

The vortex generator used in this paper is a simple rib attached to the top and the side walls of the cube, in the steam wise middle of the cube.

The flow Reynolds number based on the bulk velocity and the height of the channel was 13000.

The LES results were compared with the experimental data of [6], a good agreement was obtained.

Also the results showed that the flow in the boundary layer around the cube with vortex generator is more turbulent and unsteady than the flow around the smooth cube without the vortex generator.

More turbulent structures are generated close to the surface of the cube resulting in a good mixing of heat and hence high heat transfer coefficient and this investigation is a efficient way to enhance the heat transfer from the cube with vortex generator.