Abstract
Experiments were carried out to determine the increase in heat transfer rates as a result of mechanical vertical vibrations applied to horizontal cylinders. Two cylinders, one of 0.85cm and other of 1.27cm external diameter heated from inside by electrical resistance heaters were vibrated in still air. The ranges of amplitude, a, frequency, f, and the surface-air temperature difference, ΔT, for the first cylinder were 0–1.715 cm, 0–63.7 c/s and 18–150°C respectively. The corresponding values for the second cylinder were 0–1.78 cm, 0–68 c/s and 22–90°C. It was observed that for amplitude to diameter ratios exceeding 0.5, the relative vibrational heat-transfer coefficient increased almost linearly with the former irrespective of the frequency of vibration. Simple correlations based on experimental observations have been given to predict the vibrational heat-transfer coefficient from the known values of ΔT, a and f.
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