Heat transfer characteristics from an array of thin strips pin fins due to their exposures to a single downward jet impingement |
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Authors: | Eldesouki I Eid Abdalla G Gomaa Mohamed E Gomaa |
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Institution: | (1) Mechanical Department, Faculty of Industrial Education, Suez Canal University, Suez, Egypt;(2) Refrigeration and Air Conditioning Department, Faculty of Industrial Education, Helwan University, Cairo, Egypt;(3) Technology Department, The Specialized Studies Academy, Workers University, Ismailia, Egypt |
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Abstract: | This paper investigates the heat transfer characteristics from thin strips pin fins due to their exposure to a single circular
downward air jet impingement. Five aluminum specimens were considered; each one has a rectangular base of 84 mm × 78 mm and
it has an array of about 300 thin strips pin fins. A test rig consists mainly of air compressor; nozzle and protractor mechanism
was setup. Experiments were done to find out the effects of attack angle, Reynolds number, nozzle-to-target spacing, lateral
pitch and parallel pitch among the fins on the heat transfer characteristics. Empirical correlations were deduced to describe
the experimental data. A CFD-numerical model was introduced to monitor the flow characteristics on a scale of more details
than that possible in the experimental work. The comparison among the results of the present work and those by the literature
shows about 50% improvement in heat transfer characteristics rather than the single jet impingement onto flat plates, cylindrical
surfaces, ribbed walls and multiple jets impingement onto flat plates. |
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