Abstract
An experimental study was performed to observe the heat transfer characteristics of the natural convection from a vertical row of heated horizontal cylinders placed in a cavity. The gap between the vertical wall of the cavity and cylinder surface was varied from 0mm to infinity. Experiments were carried out under the condition of uniform heat flux for each cylinder. As results of a present investigation, it was observed that an increase in heat flux causes the increase in heat transfer coefficient. It was also found that optimum value of the gap which provides a maximum heat transfer coefficient was existed. It becomes very important for designing heating devices.
