Analysis and Discussion of Flow Boundary Layer in Fully Turbulent of Narrow Rectangular Channel
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摘要: 从宏观特性比较分析的角度出发,通过计算流体动力学(CFD)微观结果来探析矩形窄缝通道内湍流充分发展区边界层分布的特性。研究结果表明,从宏观角度看,一些适用于常规通道的经典公式仍然适用于矩形窄缝通道;现有的实验结果基本支持湍流充分发展区矩形窄缝通道内的流动和传热规律符合常规通道内特点的结论。对多种湍流模型模拟的结果与经典公式的计算结果和实验数据进行了基准分析,表明用雷诺平均的CFD技术仍然是可信的。最后,根据上面分析情况,并结合CFD获得的微观流动细节以及近壁面经典速度分布公式预测情况,详细讨论矩形窄缝通道内湍流充分发展区流动边界层的分布情况。Abstract: 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.
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