Natural convection in cavities has received much interest in recent
years due to its various engineering applications such as energy storage
system, furnace engineering, buildings heating and cooling, solar
energy collectors and cooling of electronic equipments [1]. In natural
convection, a fluid (gas or liquid) circulates between a warm wall and
a cold wall due to the density difference. This phenomenon is also
called as a force of gravity circulation. Extensive published research
works are studied this phenomena either numerically or experimentally
under different boundary conditions [2–5]. In addition, natural
convection from a circular cylinder embedded in a cavity has many
engineering applications such as industrial heat exchanger, cooling
system of machine parts and electronic packages. Tasnim et al. [6] investigated
numerically the natural convection heat transfer of fluid
surrounded an isothermal circular cylinder in a square cavity. They
concluded that eccentric positions of the cylinder showed higher
heat transfer rate than concentric position. Kumar De and Dalal [7]
investigated numerically the natural convection around a square, horizontal,
heated cylinder placed in an enclosure.