사각채널에 설치된 배플이 열전달과 마찰계수에 미치는 효과
Effects of Baffles on Heat Transfer and Friction Factorsin a Rectangular Channel
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Abstract
The present work investigates the local heat transfer characteristics and the associated frictional loss in a rectangular channel with inclined solid and perforated baffles to obtain the basic design data for gas turbine. Five different geometries of baffles such as 1) solid (without hole), 2) three holes, 3) six holes, 4) nine holes, 5) twelve holes were covered. A combination of two baffles of same overall size is used. The flow Reynolds number is ranged from 28,900 to 70,100. The placement of baffles augments the overall heat transfer greatly by combining both jet impingement and the boundary layer separation.The present results show that the average Nusselt number distribution is strongly dependent on number of holes in the baffle plates; i.e., the average Nusselt number increases with increasing number of holes. The friction factor decreases also with increasing the number of holes, however, its value increases with increasing the Reynolds number.
참고문헌 (14)
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