Analysis and Discussion of Flow Boundary Layer in Fully Turbulent of Narrow Rectangular Channel

This paper presents the flow and heat transfer in a narrow channel from the macrocosmic view,and the discussion of the flow boundary layer of the narrow rectangular channel by analysis of the results obtained by CFD code.The results show that some classical formulas in single phase are applied for narrow rectangular channels,and the current experimental results support the view that the flow and heat transfer of a narrow rectangular channel accords with that of an ordinary sized channel in fully turbulent.Secondly,the results obtained by CFD code with different turbulent models are compared with the classical formulas and experimental data,which shows that results obtained by CFD code is credible.Finally,according to microcosmic results obtained by CFD code and the velocities near the wall obtained by the classical formulas,the characteristics on flow boundary layer of the narrow rectangular channel in fully turbulent is discussed in detail.