The Numerical Study On Heat Transfer And Flow Friction Of Single-phase Convection In Rectangular Narrow Channel

In this paper, the numerical method for the problem of flow and heat transfer in rectangular narrow channel is researched. Based on the analysis of physics course of heat transfer, the mathematical model of single-phase flow in the rectangular narrow channel is proposed. And the boundary conditions are given to get the unique numerical result. The finite volume method is used to found the discrete scheme of equations. According to the flow of SIMPLER arithmetic, the computing program is developed and the correctness of program is validated.Then the program is used to solve the problem of flow and heat transfer in rectangular narrow channel.The stable two dimension velocity and temperature fields in rectangular narrow channel and plate fuel are obtained.Based on the results of the calculation above, the conclusions can be drawn that the k-εtrubulence two-equation model is appropriate for the problem of flow and heat transfer in narrow channel. And the methods employed in the thesis to slove the model are effective. The correctness of code is validated which is nessary to further researches on the two phase problem. The stable fileds of temperature and velocity show that the plate fuel has large thermal conductivity. So the highest temperature in the middle of plate fuel is relative low. The heat and temperature boundary layer is rather thin in the narrow channel and the temperature and velocity in the boundary layer change sharply. The width of the channel has influence on the frictional and heat transfer character. When the local coefficient of heat transfer is enhanced as result of changing the channel width, the friction factor is also enhanced.