Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 51, Issue 25-26, Pages 5949-5957Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2008.04.062
Keywords
Natural convection; Discrete heat sources; Heat transfer enhancement; Optimal distribution; Heat transport; Heatlines
Categories
Funding
- National Natural Science Foundation of China [50408019]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [FANEDD 200545]
- Program for New Century Excellent Talents in University [NCET-05-0688]
- Fok Ying Tung Education Foundation [104006]
- Hunan Provincial Natural Science Foundation of China [06JJ1001]
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Laminar natural convection in a two-dimensional square cavity of side length H due to two and three discrete heat source-sink pairs on the vertical sidewalls was numerically investigated. Main efforts were focused on the size and arrangement effects of the sources and sinks on the fluid flow and heat transfer characteristics. The sizes of sources and sinks were, respectively, H/4 for two sources-sinks pairs and H/6 for three sources-sinks pairs. The arrangement of the sources and sinks changes from the separated to staggered modes, i.e., first separately located on two sidewalls, then alternately located on two sidewalls, and finally alternately located oil one sidewall. The fluid flow, heat transfer, and heat transport characteristics were illustrated by streamlines, isotherms and averaged Nusselt number, and heatlines. It was found that the total heat transfer was closely related with the number of eddies in the enclosure. When the sources and sinks were split into smaller segments and/or arranged in a staggered mode, the number of eddies in the enclosure would increase and hence heat transfer was augmented. (c) 2008 Elsevier Ltd. All rights reserved.
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