Numerical Study of Natural Convection In Annular Enclosure with Linearly Varying Wall Temperature. J. eng. sustain. dev. [Internet]. 2013 Nov. 1 [cited 2024 May 14];17(5):31-46. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1053