Enhanced heat transfer and flow analysis in a backward-facing step using a porous baffle
The backward-facing step or the sudden expansion in internal flows is an important problem in different areas. In this study, a porous baffle is mounted on the opposite wall of a sudden expansion to enhance heat transfer near the step. Unlike the solid baffle, which is extensively studied in the lit...
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Veröffentlicht in: | Journal of thermal analysis and calorimetry 2020-09, Vol.141 (5), p.1919-1932 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The backward-facing step or the sudden expansion in internal flows is an important problem in different areas. In this study, a porous baffle is mounted on the opposite wall of a sudden expansion to enhance heat transfer near the step. Unlike the solid baffle, which is extensively studied in the literature, the porous baffle has a lower pressure drop, and its properties can be tuned to reach the optimal prospected performance. Effects of different porous baffle geometrical parameters including its normalized height (
H
b
= 0.5, 1.0, 1.5, 1.75), width (
W
b
= 0.5, 1, 1.5, 2.0, 2.5), porous baffle-step relative distance (
D
= 1, 2, 3, 4), Darcy number (10
−2
, 10
−3
, 10
−4
, 10
−6
), and Reynolds number (100, 200, 300, 400, 500) on the heat transfer and pressure drop are investigated. The simulation indicates that higher Reynolds numbers enhance more the heat transfer (35% improvement at Re = 500 with respect to 10% at Re = 100). Also, longer baffles can lead to higher heat transfer rates (5% improvement in
H
b
= 0.5 with respect to 32% at
H
b
= 1.5). |
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ISSN: | 1388-6150 1588-2926 |
DOI: | 10.1007/s10973-020-09437-w |