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首页> 外文期刊>Journal of Heat Transfer >Mass (Heat) Transfer Downstream of Blockages With Round and Elongated Holes in a Rectangular Channel
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Mass (Heat) Transfer Downstream of Blockages With Round and Elongated Holes in a Rectangular Channel

机译：矩形通道中带有圆形和细长孔的堵塞物的质量（热）传递下游

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摘要

Turbulent forced convective mass (heat) transfer downstream of blockages with round and elongated holes in a rectangular channel was studied. The blockages and the channel had the same 12:1 (width-to-height ratio) cross section, and a distance equal to twice the channel height separated consecutive blockages. The diameter of the holes was either 0.5 or 0.75 of the height of the channel. Naphthalene sublimation experiments were conducted with four hole aspect ratios (hole-width-to-height ratios) between 1.0 and 3.4, two hole-to-channel area ratios (ratios of total hole cross-sectional area to channel cross-sectional area) of 0.2 and 0.3, and Reynolds numbers (based on the channel hydraulic diameter) of 7000 and 17,000. The effects of the hole aspect ratio, for each hole-to-channel area ratio, on the average mass (heat) transfer and the local mass (heat) transfer distribution on the exposed primary channel wall between consecutive blockages were examined. The results of the study showed that the blockages with holes caused the average mass (heat) transfer to be as high as about eight times that for fully developed turbulent flow through a smooth channel at the same mass flow rate. The elongated holes caused higher overall mass (heat) transfer and larger spanwise variation of the local mass (heat) transfer on the channel wall than round holes.
机译：研究了矩形通道中带有圆形和细长孔的堵塞物下游的湍流强迫对流质量（热量）传递。堵塞物和通道的横截面相同，为12：1（宽高比），并且等于通道高度两倍的距离分隔了连续的堵塞物。孔的直径是通道高度的0.5或0.75。萘的升华实验是在1.0和3.4之间的四个孔长宽比（孔宽高比），两个孔长比（总孔截面积与通道截面积之比）之间进行的。 0.2和0.3，雷诺数（基于通道水力直径）分别为7000和17,000。对于每个孔与通道的面积比，孔长宽比对连续堵塞之间暴露的主通道壁上的平均质量（热）传递和局部质量（热）传递分布的影响进行了研究。研究结果表明，带孔的堵塞导致平均质量（热量）传递高达在相同质量流率下完全通过湍流通道的湍流的平均质量（热量）传递的八倍。与圆形孔相比，细长孔导致通道壁上更高的整体质量（热量）传递和局部质量（热量）传递的展向变化更大。

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