Abstract
Unsteady natural convective flow in a square enclosure with one vertical wall heated, with the opposite wall cooled to a umfom lower temperature and with the remaining walls adiabahc has bin numerically studied. The heat flux of the heated wal is spatially uniform but varying sinusoidally with time. The flow has been dt , • expressed in terms of stream function and vorticity and written in TZZoTh™' ^ ' *>* ^ the finite-element hod The solution has as parameters the heat flux Rayleigh number based on the enclosure width, the Prandtl number and the frequency and magnitude of the dimensionless heat flux variation. Results have been 1000000^1 7' ™ * ***** numbers between and 1,000,000. These results have been used to study the effects ^' ^ wall lemperature
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