Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
663450 | International Journal of Heat and Mass Transfer | 2006 | 11 Pages |
Abstract
This study experimentally determined the local and average heat transfer characteristics in asymmetrically heated sintered porous channels with metallic baffles. The fluid medium was air. Measurements on the test specimen of four modes, without baffles (A), with periodic baffles on the top portion (B), with periodic baffles on the bottom portion (C) and with staggered periodic baffles on both sides (D), are performed. The effect of the average bead diameter was also examined (d = 0.704 and 1.163 mm). The data indicated that, the wall temperatures measured at baffles attached to the heated wall were slightly lower than those nearby, especially at high Reynolds numbers. In modes B and D, the heat transfer in the inlet region was weaker than that in modes A and C. Additionally, the heat transfer by forced convection in all modes increased as the bead diameter decreased. The effect of the bead diameter became stronger as the Reynolds number was increased. At Re > 2000, heat transfer was greatest in mode B and least in mode D, in which the heat transfer was even poorer than that without baffles. For a Re of around 1000, mode D was associated with an excellent heat transfer. In such a case, heat transfer enhancement was around 20 â¼Â 30% in mode D, around 10 â¼Â 20% in mode B and around 0 â¼Â 12% in mode C.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Sheng-Chung Tzeng, Tzer-Ming Jeng, Yen-Chan Wang,