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首页> 外文期刊>Journal of Heat Transfer >Effects of Wall Rotation on Heat Transfer to Annular Turbulent Flow: Outer Wall Rotating
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Effects of Wall Rotation on Heat Transfer to Annular Turbulent Flow: Outer Wall Rotating

机译：壁旋转对热传递到环形湍流的影响：外壁旋转

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Simulations were conducted for air flowing upward in a vertical annular pipe with a rotating outer wall. Simulations concentrated on the occurrence of laminarization and property variations for high heat flux heat transfer. The compressible filtered Navier-Stokes equations were solved using a second-order accurate finite volume method. Low Mach number preconditioning was used to enable the compressible code to work efficiently at low Mach numbers. A dynamic subgrid-scale stress model accounted for the subgrid-scale turbulence. When the outer wall rotated, a significant reduction of turbulent kinetic energy was realized near the rotating wall and the intensity of bursting appeared to decrease. This modification of the turbulent structures was related to the vortical structure changes near the rotating wall. It has been observed that the wall vortices were pushed in the direction of rotation and their intensity increased near the nonrotating wall. The consequent effect was to enhance the turbulent kinetic energy and increase the Nusselt number there.
机译：模拟了在垂直的环形管道中向上流动的空气的旋转外壁。模拟着重于层流的发生和高热通量传热的特性变化。使用二阶精确有限体积法求解了可压缩滤波的Navier-Stokes方程。低马赫数预处理用于使可压缩代码在低马赫数下有效工作。动态的亚网格尺度应力模型解释了亚网格尺度的湍流。当外壁旋转时，在旋转壁附近实现了湍动能的显着降低，并且破裂的强度似乎降低了。湍流结构的这种变化与旋转壁附近的涡旋结构变化有关。已经观察到壁涡在旋转方向上被推动，并且其强度在非旋转壁附近增加。结果是增强了湍动能并增加了那里的努塞尔数。

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