Abstract

In the present study the heat transfer and the flow characteristics for the annular side of concentric tube in tube heat exchanger was experimentally investigated. The single phase water was used as working fluid for both sides of the heat exchanger. The passive technique was used to enhance the heat transfer. The discontinuous longitudinally wavy fins was used for this purpose. The water flow rate of the annular side was ranged between (3.33×10-5 to 8.33×10-5 m3/s), while the water flow rate of the tube side was kept at a constant level. The laminar flow was achieved in annular side for all water flow rate testes levels and the flow was turbulent for tube side. The heat transfer rate and the convective coefficient were augmented but this was accompanied by an increase in pressure drop and friction factor. The heat transfer rate was improved by a range of (15 to 25%). The friction factor obtained with finned tube was higher than that of the plain tube by (8 to 18%). The overall enhancement factor ranged between (1.11 to 1.19).

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The article was added to IASJ on 2018-01-24

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