“…Much systematized knowledge of heat transfer and fluid flow has been gained in several studies in which annular enclosures have been used (Powe, et al., [5]; Mahony, et al, [6]; Dosch and Beer, [7]; Wang, et al, [8,9]). Much systematized knowledge of heat transfer and fluid flow has been gained in several studies in which annular enclosures have been used (Powe, et al., [5]; Mahony, et al, [6]; Dosch and Beer, [7]; Wang, et al, [8,9]).…”