Heat convection length for boundary-layer flows
| Autor: | Tien-Mo Shih, Chandrasekhar Thamire, YuJiang Zhang |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Physics
Natural convection Convective heat transfer General Chemical Engineering Thermodynamics Rayleigh number Mechanics Condensed Matter Physics Atomic and Molecular Physics and Optics Fin (extended surface) Forced convection Physics::Fluid Dynamics Combined forced and natural convection Physics::Atmospheric and Oceanic Physics Rayleigh–Bénard convection Convection cell |
| Zdroj: | International Communications in Heat and Mass Transfer. 38:405-409 |
| ISSN: | 0735-1933 |
| DOI: | 10.1016/j.icheatmasstransfer.2010.12.026 |
| Popis: | In analyses of heat convection problems, it is traditional to introduce the heat transfer coefficient, h, such that the average heat flux at the solid surface can be conveniently calculated. To find h, one has to simultaneously solve governing equations for conservations of mass, momentum, and energy. This task may prove too challenging for contemporary undergraduate students. In the present study, we propose a heat convection length, Δs, which can greatly simplify the analysis, yet allow the convection characteristics to be retained. Classical examples for laminar boundary-layer air flows driven by forced convection or free convection over flat plates with length L are presented. For forced convection, Δs/L is found to be 2.026 for a wide range of Re; for free convection, Δs/L is found to be 2.511 for various Gr values. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect