Effects of Length and Configuration of Transverse Discrete Ribs on Heat Transfer and Friction for Turbulent Flow in a Square Channel
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This investigation examines the effects of varying the length and configuration of transverse discrete ribs on the heat transfer and friction characteristics of turbulent air flow in a square channel. The ribs are attached to two opposite walls of the channel. The lengths of the discrete ribs are equal to one-half, one-third, or one-fifth of that of the transverse full ribs. Results show that a staggered array of longer transverse rib segments improves the ribbed wall heat transfer more than a staggered array of shorter rib segments. Staggered arrays of transverse discrete ribs enhance more heat transfer from the ribbed walls than transverse full ribs. Among the cases studied, the staggered l x l ribs with p/e=10 improve the ribbed wall heat transfer the most and cause the highest pressure drop. On a per unit pumping power basis, the staggered l x l ribs improve the channel wall heat transfer slightly better than the staggered 2 x 1 and staggered 3 x 2 rib arrays. Freund Publishing House Ltd.
