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Heat Transfer and Friction Behaviour in a Channel with an Inclined Perforated Baffle  

Krishna Putra, Ary Bachtiar (Dept. of Mechanical System Engineering, Graduate School, Gyeongsang National University)
Ahn, Soo-Whan (School of Mechanical & Aerospace Engineering, Institute of Marine Industry, Gyeongsang National University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.16, no.2, 2008 , pp. 70-76 More about this Journal
The effects of the inclined perforated baffles on the distributions of the local heat transfer coefficients and friction factors for air flows in a rectangular channel were determined for Reynolds numbers from 23,000 to 57,000. Four different types of the baffle are used. The inclined baffles have the width of 19.8cm, the square diamond type hole having one side length of 2.55cm, and the inclination angle of $5^{\circ}$, whereas the corresponding channel width-to-height ratio was 4.95. Results show that the heat transfer and friction factor depend significantly on the number of baffle holes and Reynolds number. The friction factor decreases with increasing Reynolds number and the number of holes on the baffle, and the heat transfer performance of baffle type II (3 hole baffle) has the best value.
Rectangular duct; Inclined baffle; Heat transfer; Friction factor; Square diamond type hole;
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