Effect of non-uniform heat flux on wall friction and convection heat transfer coefficient in a trapezoidal channel
| Autor: | M. F. Dowling, S. M. Ghiaasiaan, Sheldon Jeter, Said I. Abdel-Khalik, T.J. Remley |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Convective heat transfer Turbulence Mechanical Engineering Prandtl number Thermodynamics Reynolds number Heat transfer coefficient Condensed Matter Physics Physics::Fluid Dynamics symbols.namesake Heat flux symbols Hydraulic diameter Communication channel |
| Zdroj: | International Journal of Heat and Mass Transfer. 44:2453-2459 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/s0017-9310(00)00295-7 |
| Popis: | Turbulent wall friction and forced convection heat transfer in a water-cooled trapezoidal channel were experimentally investigated. The parameter ranges were: Reynolds number=10 4 –8.6×10 4 , and Prandtl number=2.2–5.5. The channel hydraulic diameter was 1.14 cm, and its total and heated lengths were 139.4 and 60.9 cm, respectively. The Colebrook correlation predicted the unheated channel friction factors well. It, however, systematically over predicted the measured friction factors obtained with the test section non-uniformly heated. Perimeter-average convective heat transfer coefficients for laterally non-uniform imposed heat fluxes were compared with the predictions of three widely-used correlations for turbulent flow in circular channels. All the correlations under predicted the data, typically by 11–28%. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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