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Mechanism of wall transfer under steady localized blowing

机译:稳定局部吹动下的壁转移机理

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The scalar transport downstream of a localized blowing is analyzed through direct numerical simulations, in a fully developed low-Reynolds number turbulent channel flow subject to constant wall temperature. The Karman number is 180 and the Prandtl number is 1. The streamwise extend of the blowing spanwise slot is varied in a large range, going from the half channel height to particularly small values that are roughly twice the viscous sublayer thickness, while past published experimental and numerical results focused on significantly larger slots. Detailed data on the flow and temperature fields are reported and discussed. It is shown that, the severity parameter defined as the ratio of injected mass to the mean flow rate considered as the main similarity parameter so far, is no more valid when the streamwise extends of localized wall intervention becomes comparable to the buffer layer thickness. The Reynolds analogy breaks-up and the local wall transfer is significantly enhanced under these conditions.
机译:通过直接数值模拟,在壁温恒定的情况下,在充分发展的低雷诺数湍流通道流中,通过直接数值模拟分析了局部吹塑下游的标量传输。 Karman数为180,Prandtl数为1。吹扫展向缝隙的沿流方向的变化范围很大,从半通道高度到特别小的值,大约是粘性子层厚度的两倍,而过去已发表实验数值结果集中在更大的插槽上。报告并讨论了有关流场和温度场的详细数据。结果表明,当局部壁干预的沿河方向延伸变得与缓冲层厚度相当时,定义为到目前为止的主要相似性参数的定义为注入质量与平均流速之比的严重性参数不再有效。在这些条件下,雷诺类比破裂,并且局部壁转移明显增强。

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