每年出版 8 期
ISSN 打印: 1065-5131
ISSN 在线: 1563-5074
Indexed in
THERMOHYDRAULIC PERFORMANCE OF TUBE EXCHANGER ENHANCED WITH DETACHED CIRCULAR RINGS FROM WALL
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.
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