A Study of Wall-Turbulence Phenomena Using Hot-Film Sensors
A Study of Wall-Turbulence Phenomena Using Hot-Film Sensors
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使用热膜传感器研究壁湍流现象
DOI：
10.1115/1.3597444
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发表时间：
1968
影响因子：
--
通讯作者：
J. Keyes
中科院分区：
文献类型：
--
作者：
R. A. Armistead;J. Keyes
采用冲洗式热膜传感器，研究了在雷诺数11000 ~ 170,000范围内，由局部湍流引起的管内水流换热速率波动。测定了功率谱密度、特征频率（从信号越过零电平的速率获得）、振幅密度和传热波动的强度。对壁面附近传热波动关系的研究表明，存在显著的相关性，随着风速计从壁面传感器上游的中等距离移动到壁面传感器下游的中等距离，这种相关性系统地降低。在雷诺数为52,000的壁面附近速度波动的自相关曲线中观察到周期分量的证据。所确定的周期与爱因斯坦和Li[11]和Black[11]亚层流模型所预测的周期具有相同的数量级。
Flush-mounted hot-film sensors were used to study local turbulence-induced fluctuations in the rate of heat transfer in pipe flow of water for a Reynolds number range of 11,000 to 170,000. Determinations were made of power spectral density, characteristic frequency (obtained from the rate at which the signal crossed its zero level), amplitude density, and intensity of the heat-transfer fluctuations. Studies of the relationship between the heat-transfer fluctuations in the vicinity of the wall indicated that a significant correlation existed which systematically decreased as the anemometer was moved from moderate distances upstream to moderate distances downstream of the wall sensor. Evidences of a periodic component were observed in the autocorrelation curves of velocity fluctuations in the vicinity of the wall for a Reynolds number of 52,000. The period determined was of the same order of magnitude as that predicted by Einstein and Li [10]2and Black [11] sublayer flow models.