Coupled heat and mass transfer in mixed convection over a wedge with variable wall temperature and concentration in porous media: The entire regime
- Air Force Aeronautical and Technical School, Kaohsiung (Taiwan, Province of China). Dept. of General Course
Convective heat transfer in a porous medium has a number of thermal engineering applications such as moisture transport in thermal insulations, ceramic processing, the extraction of geothermal energy, nuclear reactor cooling system, underground nuclear waste disposal, ground water pollution and filtration processes. Here, a boundary layer analysis is used to investigate both heat and mass transfer characteristics of mixed convection about a wedge in saturated porous media under the coupled effects of thermal and mass diffusion. The surface of the wedge is maintained at a variable wall temperature (VWT) and variable wall concentration (VWC). The nonsimilar governing equations are obtained by using a suitable transformation and solved by Keller box method. Numerical results are presented for the local Nusselt number and the local Sherwood number. Increasing the buoyancy ratio N, the exponent of wall temperature/concentration n and the wedge angle parameter {lambda} increases the local Nusselt number and the local Sherwood number. As mixed convection parameter {chi} varies from 0 to 1, the local Nusselt number and the local Sherwood number decrease initially, reach a minimum in the intermediate value of {chi} and then increase gradually. It is apparent that the Lewis number has a pronounced effect on the local Sherwood number than it does on the local Nusselt number. Furthermore, increasing the Lewis number decreases (increases) the local heat (mass) transfer rate.
- OSTI ID:
- 292976
- Journal Information:
- International Communications in Heat and Mass Transfer, Vol. 25, Issue 8; Other Information: PBD: Nov 1998
- Country of Publication:
- United States
- Language:
- English
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