the heat transfer coefficients at various inlet air temperatures are plotted versus the superficial velocity. The heat transfer coefficients obtained from the experiments at the same superficial velocity are very likely to be identical over the temperature range of
130–150C, indicating less important contribution of temperature to the heat transfer coefficient. The dimensional analysis was used to correlate the heat transfer coefficient represented by Nusselt number, Nu,with Reynolds number,Re, and geometric factor, H/dp.A power form of the function was assumed