Abstract
The interaction effects of surface radiation with natural convection of a transparent medium in an asymmetrically cooled square cavity including a partially heated inner circular cylinder have been numerically simulated. In this context the finite volume method and the discrete ordinates method are incorporated to simulate radiation problems. The flow inside the cavity is driven by the heated part of the circular cylinder maintained at high temperature . The cavity is filled with air () cooled by a single vertical wall maintained at a fixed cold temperature . The other portion of the inner circular cylinder and the remaining walls of the enclosure are insulated. The hydrodynamic and thermal behavior of the fluid and the convective and radiative heat transfer are investigated for Rayleigh number ranging from to , the common emissivity of the inner and outer surfaces, the angular size of the circular heater, and its angular position . The numerical work is carried out using an in-house computational fluid dynamics code. The obtained results showed that the role of radiation is well stronger than convection in determining the total heat transfer rate when the position of the heated portion is changed.
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