Periodical heat transfer in parallel-plate channel of improved flow-inclining inserts

Periodical heat transfer in parallel-plate channel of improved flow-inclining inserts
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改进的倾斜流动插入件的平行板通道中的周期性传热

DOI:
10.1016/j.ijthermalsci.2009.02.001
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发表时间:
2009-09
影响因子:
4.5
通讯作者:
夏国栋
夏国栋
中科院分区:
工程技术2区
文献类型:
--
作者:
夏国栋

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本文对带准流线型插片的二维通道在周期性完全展开状态下的对流换热和流动阻力进行了数值研究。雷诺数的范围既包括层流,也包括湍流。确定了插入角、板厚和雷诺数对传热和摩擦系数的影响。在插入角从0°到30°范围内,换热效果单调增强。然而,在层流情况下,插入角对流动阻力的影响远小于湍流情况。综合分析表明,较厚的刀片适用于层流,较薄的刀片适用于湍流。在任何情况下,准流线型插入作为一个升级到局部传热系数。与原来的直流式斜插片相比,流线型插片在很大程度上降低了流动阻力,但传热性能只有适度恶化。在相同泵功率消耗的情况下,通过对改进流线刀片的评价,可以看出改进流线刀片相对于直线刀片的优越性。
The convective heat transfer and the flow resistance in the 2-D channel with quasi-streamlined insert have been numerically studied in the periodically fully developed regime. The range of the Reynolds number covers both the laminar and the turbulent flow. The effect of the insert angle, the plate thickness vs the Reynolds number on the heat transfer and the friction factor has been identified. The heat transfer gets stronger monotonically with the insert angle from 0° to 30°. Nevertheless, the insert angle impacts the flow resistance in the laminar case much less than in the turbulent case. The combined analysis indicates that the thicker insert is suitable to use in the laminar flow and the thinner insert suitable to the turbulent flow. In any case, the quasi-streamlined insert acts as an upgrader to the local heat transfer coefficient. In comparison with the effect of the original straight flow-inclining insert, the streamlined insert largely diminishes the flow resistance but with only moderate deterioration of the heat transfer. The assessment under the identical pump power consumption reveals the superiority of the improved streamline insert to the straight one.
DOI: --
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