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首页> 外文期刊>Journal of Heat Transfer >An Improved Numerical Study of the Wall Effect on Hot-Wire Measurements
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An Improved Numerical Study of the Wall Effect on Hot-Wire Measurements

机译：热线测量中壁效应的改进数值研究

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摘要

Numerical investigations of the heat transfer from hot wires in near-wall measurements were carried out. Special attention was paid to the effect of the wall thickness, the flow conditions below the wall and the shear velocity connected to different wall materials. Compared with previous studies, an improved physical model taking into account the flow region below the wall in the computational domain was applied. The results obtained agree well with experimental data in the literature for walls consisting of both highly and poorly conducting materials. The investigation showed that the shear velocity U_ τ has a significant influence on hot-wire measurements in the vicinity of a wall. Nevertheless, discernible effects of the wall thickness and the flow condition below the wall were found only in the case of a poorly conducting wall. In addition, the results also suggest a weak effect of the overheat ratio for a wire with an infinitely large aspect ratio.
机译：进行了近壁测量中热线传热的数值研究。特别注意壁厚，壁下流动条件和连接到不同壁材料的剪切速度的影响。与以前的研究相比，应用了一种改进的物理模型，该模型考虑了计算域中墙下方的流动区域。对于由高导电性和低导电性材料组成的墙体，获得的结果与文献中的实验数据非常吻合。研究表明，剪切速度U_τ对壁附近的热线测量有重要影响。然而，仅在导电性较差的情况下才能发现壁厚和壁下流动状态的明显影响。另外，该结果还表明，对于纵横比无限大的导线，过热比的影响较小。

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