Abstract The paper elaborates on experimental studies of heat transfer and kinematic structure of steady and pulsating air flows past a spanwise rib. The forcing frequency range of (0–30) Hz is considered, and the normalized forcing amplitude of velocity is 0.5. Forced flow pulsations are shown to enhance heat transfer if compared to the steady-state flow, particularly in the near-wake region behind the rib. Experimental data on the heat transfer coefficient in pulsating flows are best generalized using the non-dimensional pulsation frequency (Strouhal number). Profiles of velocity and turbulent parameters are demonstrated at a number of representative coordinates along the separation region. The dynamics of the kinematic structure of pulsating flows is described using the profiles of parameters in different phases of forced flow pulsations. The correlation between local heat transfer in the separation region and local hydrodynamic parameters is analyzed. The distribution of heat transfer coefficient over the wall in the rib wake correlates best with the distributions of transverse velocity component.

中文翻译：

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肋后脉动流的传热与结构

摘要 本文详细阐述了稳定和脉动气流通过展向肋的传热和运动学结构的实验研究。考虑了（0-30）Hz的强迫频率范围，速度的归一化强迫幅度为0.5。与稳态流动相比，强制流动脉动可以增强传热，特别是在肋条后面的近尾流区域。脉动流中传热系数的实验数据最好使用无量纲脉动频率（斯特劳哈尔数）来概括。在沿分离区域的多个代表性坐标处展示了速度和湍流参数的轮廓。脉动流运动学结构的动力学是使用强制流脉动不同阶段的参数分布来描述的。分析了分离区局部传热与局部水动力参数之间的相关性。肋条尾流中壁上传热系数的分布与横向速度分量的分布最相关。