The treatment of Convective Heat Transfer Coefficients (CHTCs) in an enclosure has a significant impact on the thermal design of electronic appliance, especially the CHTCs in an enclosure with internal isolated blocks. The CHTCs of the isolated blocks for pure natural convection are usually used, while it may not be applicable to any practice. Combined convective heat transfer, even forced convective heat transfer, is sometime more applicable in reality. In our present work, first of all, validation of the turbulence model for CFD simulation of natural convective flows in a square enclosure is performed. The values of CHTCs for vertical walls obtained by using a low Reynolds k-ε model agree well with the existed correlations. The simulation also indicates that the distance from the first grid to the wall has a significant impact on the CHTCs. Using this low Reynolds k-ε model, computer simulations of natural and forced convective heat transfer within a square enclosure containing ten isolated blocks are performed. For both the natural and forced convection, the dimensionless Nusselt numbers are derived by the obtained results. For the case of mixed convection, the CHTCs are established by blending those for natural and forced convection using the Churchill-Usagi approach, which is a general expression combines the asymptotic solutions of independent CHTCs into the mixed convection by using a Churchill-Usagi blending coefficient.
Skip Nav Destination
ASME 2005 International Solar Energy Conference
August 6–12, 2005
Orlando, Florida, USA
Conference Sponsors:
- Solar Energy Division
ISBN:
0-7918-4737-3
PROCEEDINGS PAPER
Numerical Study of Convective Heat Transfer of Multiple Internal Isolated Blocks in an Enclosure
Xutao Zhang,
Xutao Zhang
North China Electric Power University, Baoding, Hebei, China
Search for other works by this author on:
Jianing Zhao,
Jianing Zhao
Harbin Institute of Technology, Harbin, Heilongjiang, China
Search for other works by this author on:
Fusheng Gao,
Fusheng Gao
Harbin Institute of Technology, Harbin, Heilongjiang, China
Search for other works by this author on:
Jun Gao,
Jun Gao
Harbin Institute of Technology, Harbin, Heilongjiang, China
Search for other works by this author on:
Songling Wang
Songling Wang
North China Electric Power University, Baoding, Hebei, China
Search for other works by this author on:
Xutao Zhang
North China Electric Power University, Baoding, Hebei, China
Jianing Zhao
Harbin Institute of Technology, Harbin, Heilongjiang, China
Fusheng Gao
Harbin Institute of Technology, Harbin, Heilongjiang, China
Jun Gao
Harbin Institute of Technology, Harbin, Heilongjiang, China
Songling Wang
North China Electric Power University, Baoding, Hebei, China
Paper No:
ISEC2005-76108, pp. 181-187; 7 pages
Published Online:
October 15, 2008
Citation
Zhang, X, Zhao, J, Gao, F, Gao, J, & Wang, S. "Numerical Study of Convective Heat Transfer of Multiple Internal Isolated Blocks in an Enclosure." Proceedings of the ASME 2005 International Solar Energy Conference. Solar Energy. Orlando, Florida, USA. August 6–12, 2005. pp. 181-187. ASME. https://doi.org/10.1115/ISEC2005-76108
Download citation file:
9
Views
Related Proceedings Papers
Related Articles
Combined Forced and Free Upward-Flow Convection in the Entrance Region Between Inclined Parallel Plates
J. Heat Transfer (August,1989)
Bouyancy Effect on Forced Convection in Vertical Tubes at High Reynolds Numbers
J. Thermal Sci. Eng. Appl (December,2010)
The Criterion for Turbulent Combined Forced and Natural Convection in a Vertical Flow System
J. Heat Transfer (February,1996)
Related Chapters
Mixed-Up Convection
Hot Air Rises and Heat Sinks: Everything You Know about Cooling Electronics Is Wrong
CFD Simulations of a Mixed-flow Pump Using Various Turbulence Models
Mixed-flow Pumps: Modeling, Simulation, and Measurements
Applications
Introduction to Finite Element, Boundary Element, and Meshless Methods: With Applications to Heat Transfer and Fluid Flow