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Coefficients are reported for transfer of heat from a horizontal cylinder and from vertical, flat surfaces (paired back-to-back, closely spaced-apart) to 30-mm deep vibrated beds (25 Hz) of alumina spheres and high- and low-density glass beads (at sizes from 63 to 707 μm). In general, the flat surfaces afford higher coefficients, but heat transfer is sensitive to pattern and vigor of powder circulation...
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