سال انتشار: ۱۳۹۱

محل انتشار: اولین کنفرانس انتقال حرارت و جرم ایران

تعداد صفحات: ۶

نویسنده(ها):

Hojat Khozeymehnezhad – M.Sc. student, University of Birjand, Department of Mechanical Engineering;
Sayed Ali Mirbozorgi – Asistant Professor, University of Birjand, Department of Mechanical Engineering

چکیده:

Numerical calculations are carried out for natural convection induced by a temperature difference between a cold outer square enclosure and a hot inner cylinder with two different geometries (i.e. circular and square). A two-dimensional solution for natural convection is obtained, using the finite volume method for different Rayleigh numbers varying over the range of (1000–۱۰۰۰۰۰). The study goes further to investigate the effect of the inner cylinder location on the heat transfer and fluid flow. The location of the inner cylinder is changed vertically along the center-line of square enclosure. The number, size and formation of the cell strongly depend on the Rayleigh number and the position of the inner cylinder. As the obtained total surfaces-averaged Nusselt numbers of the enclosure show, in all cases, at the same Rayleigh number, the rate of heat transfer from the enclosure which the circular cylinder is located inside it is better.