Treatment of the inlet boundary conditions in natural-convection flows in open-ended channels
Journal Article
·
· Numerical Heat Transfer. Part B, Fundamentals
OSTI ID:357700
- Federal Univ. of Paraiba, Campina Grande, Paraiba (Brazil). Mechanical Engineering Dept.
- Federal Univ. of Santa Catarina, Florianopolis, Santa Catarina (Brazil). Mechanical Engineering Dept.
Natural-convection heat transfer in open-ended channels is encountered in a large number of engineering applications, as in the cooling of electronic equipments, solar collectors, grain drying equipments, room cooling/heating by passive systems, heat transfer in the condenser of domestic refrigerators, etc. The present work deals with the numerical solution of elliptic flows encountered in open-ended channels. The important question of applying boundary conditions for pressure and velocity for these flows is considered and a new method for the application of boundary conditions at the channel inlet is proposed. It is shown that the flow reversal at the channel outlet, which appears when nonsymmetric flow conditions are present, is strongly dependent on the entrance boundary conditions for pressure. Results for the straight channel in situations where flow reversal is present are reported for a wide range of Rayleigh numbers. Solutions for L-shaped channels are also reported with the aim of demonstrating the application of the model to arbitrary channels. It is shown that for certain flow situations the use of an elliptic formulation is imperative in order to predict correctly the flow behavior in open-ended channels.
- OSTI ID:
- 357700
- Journal Information:
- Numerical Heat Transfer. Part B, Fundamentals, Journal Name: Numerical Heat Transfer. Part B, Fundamentals Journal Issue: 3 Vol. 35; ISSN 1040-7790; ISSN NHBFEE
- Country of Publication:
- United States
- Language:
- English
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