Heat-transfer studies were carried out in a packed bed of glass beads, cooled by the wall, through which air percolated. Tube-to-particle diameter ratios (D/d p ) ranged from 1.8 to 55, while the air mass flux ranged from 0.204 to 2.422 kg/m 2 ‚s. The outlet bed temperature (T L ) was measured by a brass ring-shaped sensor and by aligned thermocouples. The resulting radial temperature profiles differed statistically. Angular temperature fluctuations were observed through measurements made at 72 angular positions. These fluctuations do not follow a normal distribution around the mean for low ratios D/d p . The presence of a restraining screen, as well as the increasing distance between the temperature measuring device and the bed surface, distorts T L . The radial temperature profile at the bed entrance (T 0 ) was measured by a ring-shaped sensor, and T 0 showed to be a function of the radial position, the particle diameter, and the fluid flow rate.
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