@Article{, title={LAMINAR NATURAL CONVECTIVE HEAT TRANSFER IN PARABOLIC ENCLOSURES}, author={Ola Kamiyo}, journal={KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية}, volume={12}, number={4}, pages={78-93}, year={2021}, abstract={A finite volume analysis of laminar natural convection of air within full parabolic enclosuresheated from below is reported for the enclosure aspect ratio 0.27  AR  0.7 and a range of theRayleigh number 5.5 x 106  Ra  9.8 x 107. The shape of the enclosures strongly affects theresults obtained. Quasi-symmetrically arranged counter-rotating vortices are formed in each ofthe enclosures. The shape of the cells are influenced by the bounding curved and flat surfacesas they change from being rectangular at the periphery to circular at the core. There arereduction in the size and intensity of the on the cells from the center to the bottom corners. Atsteady state, there exists in each enclosure a central thermal plume that thickens as the roofpitch angle increases. The heat transfer pattern matches the flow of the plumes and jets fromthe walls. For the 15o roof pitch enclosure, the heat transfer rate increases sharply at a criticalRa value of 5 x 106.

} }