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首页> 外文期刊>Heat Transfer Research >CFD METHOD STUDY OF THE INFLUENCE OF PULSATING FREQUENCY ON ENHANCEMENT OF HEAT TRANSFER FROM A RECTANGULAR FLAT PLATE IN LAMINAR PULSATING FLOWS INSIDE A VERTICAL CIRCULAR CHANNEL
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CFD METHOD STUDY OF THE INFLUENCE OF PULSATING FREQUENCY ON ENHANCEMENT OF HEAT TRANSFER FROM A RECTANGULAR FLAT PLATE IN LAMINAR PULSATING FLOWS INSIDE A VERTICAL CIRCULAR CHANNEL

机译：CFD方法研究脉动频率对垂直圆形通道内层流脉动中矩形平板的传热的影响

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摘要

The effect of pulsating frequency on heat transfer from a rectangular flat plate in laminar pulsating flows inside a vertical circular channel was studied numerically to explore the controlling mechanism for heat transfer enhancement. Quantitatively accurate, second-order schemes for time, space, momentum, and energy were employed, and fine meshes were used. The unsteady, incompressible Navier-Stokes equations along with the energy equation were solved by the ANSYS (R) 13.0 segregated solver. The numerical results agreed well with the data from the experiment. It is found that the spatial averaged surface temperature of the rectangular flat plate fluctuates with time, and the temperature field around the rectangular flat plate oscillates in special modes at the same frequency as the flow pulsations. The heat resistance was observed to be larger during flow reversal than that during forward flowing, and it fluctuates in phase with the pressure waves. In addition, a detailed analysis found that the RMS (root-mean-square) value of the axial velocity controls the heat transfer enhancement in pulsating flows at different pulsating frequencies when the pressure amplitude and the Reynolds number remain unchanged.
机译：数值研究了脉动频率对垂直圆形通道内层流脉动流中矩形平板传热的影响，以探索增强传热的控制机制。采用定量精确的时间，空间，动量和能量的二阶方案，并使用细网格。不稳定的，不可压缩的Navier-Stokes方程以及能量方程由ANSYS（R）13.0隔离求解器求解。数值结果与实验数据吻合良好。发现矩形平板的空间平均表面温度随时间波动，并且矩形平板周围的温度场以与流动脉动相同的频率以特殊模式振荡。观察到在逆流期间的耐热性大于在顺流期间的耐热性，并且其与压力波同相波动。另外，详细分析发现，当压力幅度和雷诺数保持不变时，轴向速度的RMS（均方根）值控制着脉动流在不同脉动频率下的传热增强。

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