O.V.Shaldenko, A.A.Gourjii Analysis of heat transfer processes in a straight channel with fittings at low Reinolds numbers |
Applied hydromechanics, Vol. 17 (89) ¹ 3, (2015) |
| The two-dimensional convection-diffusion problems of heat transfer from the fluid inside the straight channel at low Reynolds numbers with periodic, symmetric system of fittings of different geometry into an external solid space with constant thermal conductivity is considered. It is assumed that the fluid is viscous, homogeneous, and incompressible with constant physical parameters. The hydrodynamic problem is solved numerically in terms of “stream function–vorticity” using a simple explicit method for solving equations of vorticity transport, convection-diffusion thermal conductivity, and successive over-relaxation method for solving the Poisson equation for stream function. It is shown that the introducing of fittings in the straight channel increases both the pressure gradient required for the formation of the flow with given parameters, and the heat flux through the channel boundaries. It was found that system of fittings in the channel at Reynolds numbers Re<(150 ... 200) is ineffective from energy point of view. On the other hand, the fittings with height of 0.2D (where D is channel width) spaced at distance D from each other, are the most effective case for increasing the heat flow through boundaries of the channel in the range of Re=(500 ... 650). |
|
KEY WORDS: heat transfer processes, two-dimensional channel, viscous flow |
| TEXT LANGUAGE: Russian |