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首页> 外文期刊>Journal of enhanced heat transfer >THERMOHYDRAULIC PERFORMANCE OF TUBE EXCHANGER ENHANCED WITH DETACHED CIRCULAR RINGS FROM WALL
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THERMOHYDRAULIC PERFORMANCE OF TUBE EXCHANGER ENHANCED WITH DETACHED CIRCULAR RINGS FROM WALL

机译：壁上分离的圆环增强了管交换器的热工性能

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摘要

Heat transfer and fluid flow characteristics in a round tube fitted with circular ring flow blockages were studied. The experiments were conducted on a heat exchanging tube fitted with circular rings, with a circumferential gap between the ring and inner wall of the tube as well as rings in the wall-attached position. Circular rings were selected as flow blockage geometry and configured with a different inner diameter to achieve flow blockage areas of 30%, 40%, and 50%. Moreover, each ring blockage had a different outer diameter to achieve a gap of 0 mm (no gap; i.e., wall-attached position), 1 mm, 2 mm, and 3 mm between the ring and tube wall. Parameters varied during the tests were flow blockage area (FBA), gap, and Reynolds number. The pitch diameter ratio was kept constant for all inserts. Air with ambient temperature was used as a working fluid in a test tube in which the inner wall is maintained at uniform heat flux. The Reynolds number varied from 6000 to 24,000. A significant effect of the gap between the outer circumference of the ring and the inner wall of the tube was observed on pressure drop as well as the rate of heat transfer across the test section. Among the tested inserts, insert (50.1) with a circular ring of 50% FBA and 1 mm gap gives the highest enhancement in the rate of heat transfer, which is 3.51 times compared to the smooth tube at higher Reynolds number. Insert (30.0) that is, the circular ring that offers flow blockage area (30%) and in a wall-attached position gives the highest overall performance factor (1.26) at a lower Reynolds number.
机译：研究了装有圆环流阻塞的圆管中的传热和流体流动特性。在装有圆环的热交换管上进行实验，该热交换管在圆环和管的内壁之间以及在壁附接位置的圆环之间具有周向间隙。选择圆环作为阻流几何形状，并配置不同的内径以实现30％，40％和50％的阻流面积。此外，每个环阻塞具有不同的外径，以在环和管壁之间形成0mm的间隙（无间隙；即壁附接位置），1mm，2mm和3mm。测试期间变化的参数是流量阻塞面积（FBA），间隙和雷诺数。所有刀片的螺距直径比保持恒定。将具有环境温度的空气用作试管中的工作流体，在试管中，内壁保持均匀的热通量。雷诺数从6000到24,000。观察到环的外圆周与管的内壁之间的间隙对压降以及穿过测试部分的热传递速率的显着影响。在测试的嵌件中，带有50％FBA圆环和1 mm间隙的圆环的嵌件（50.1）的传热速率最高，与雷诺数较高时的光滑管相比，传热速率提高了3.51倍。插入件（30.0），即提供流动阻塞面积（30％）并在壁挂位置的圆环，在较低的雷诺数下具有最高的整体性能系数（1.26）。

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