Abstract
The interaction of natural convection with thermal radiation of black surfaces in a cylindrical enclosure filled with air has been numerically investigated. The steady-state continuity, Navier-Stokes and energy equations were discretized using the control volume method and solved numerically via the SIMPLER algorithm. Effects of Rayleigh number (Ra), wall emissivity (εp) and height ratio parameter (X) are studied. The result shows that surface radiation significantly altered the temperature distribution and the flow patterns, especially at higher Rayleigh numbers. The total average Nusselt number has also been discussed for valuating heat transfer through the enclosure.
Highlights
Coupled natural convection and radiation transport processes find applications in many engineering problems, such as solar energy collectors, cooling of electronic devices and double windows
Their results demonstrated that the surface radiation has an important influence on the temperature distribution and flow patterns especially at high Rayleigh numbers (Ra).More recently, Colomer et al [17] analyzed the natural convection phenomenon coupled with radiant exchange in a three-dimensional differentially heated cavity
The combined natural convection with radiation by black surfaces in a cylindrical annular cavity filled with air has been numerically investigated
Summary
Coupled natural convection and radiation transport processes find applications in many engineering problems, such as solar energy collectors, cooling of electronic devices and double windows. The effect of radiation on combined heat transfer with convection or conduction is more important, especially with the presence of a participating medium and/or radiative surface with large emissivities [1,2,3,4,5,6,7,8]. Akiyama and Chong [16] studied the problem of a square enclosure with gray surfaces filled with air Their results demonstrated that the surface radiation has an important influence on the temperature distribution and flow patterns especially at high Rayleigh numbers (Ra).More recently, Colomer et al [17] analyzed the natural convection phenomenon coupled with radiant exchange in a three-dimensional differentially heated cavity. They have founded that the height variation ratio altered the temperature distribution and velocity
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