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首页> 外文期刊>Journal of Flow Visualization and Image Processing >FORMATION OF RETURN FLOWS IN MIXED CONVECTIVE GAS FLOW OVER A MODEL HEATED SUBSTRATE
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FORMATION OF RETURN FLOWS IN MIXED CONVECTIVE GAS FLOW OVER A MODEL HEATED SUBSTRATE

机译：模型加热基体上混合对流气流中回流的形成

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摘要

An experimental flow visualization has been carried out here to investigate the transient return flaw formation in mixed convection of gas over a heated circular plate embedded in the bottom of a horizontal flat duct, simulating that in a horizontal longitudinal flow reactor. The results reveal that shortly after the transition is started the forced flow is first reversed by the buoyancy force to move upstream in the region near the duct sides just above the outer edge of the heated plate and there are two small return-flow zones in the duct. Then, the forced flow over the entire upstream edge of the heated plate is reversed. Because of the circular geometry of the heated plate, a semicircular return-flow zone appears surrounding the whole upstream edge of the heated plate. This upstream return flow later gradually approaches a steady state. Besides, a downstream unsteady return-flow zone that appears slightly later than the upstream one is also observed in the duct. The two return-flow zones do not contact with each other.
机译：在此进行了实验流动可视化，以研究在水平扁平管道底部嵌入的加热圆形板上气体在气体对流中的瞬态回流缺陷的形成，从而模拟了在水平纵向流动反应器中的情况。结果表明，在过渡开始后不久，浮力首先使强制流动反向，从而在受热板外缘正上方的管道侧附近区域内向上游移动，并且在管道内有两个小的回流区域。管。然后，在加热板的整个上游边缘上的强制流动反向。由于加热板的圆形几何形状，围绕加热板的整个上游边缘出现了一个半圆形的回流区。该上游回流随后逐渐接近稳态。此外，在管道中还观察到下游的不稳定回流区，其出现的时间稍晚于上游的回流区。两个回流区不相互接触。

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