EFFECT OF VIBRATION ON HEAT TRANSFER FROM CYLINDERS IN FREE CONVECTION
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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A number of investigations have been conducted with horizontal cylinders in free convection to determine the effect of vibration on the heat transfer rate. This study was a continuation using higher vibration intensities PRODUCT OF AMPLITUDE AND FREQUENCY. An attempt was made to correlate the change in the heat transfer rate with that of forced convection. The investigation was conducted with three different size cylinders vibrated transversly in air. The diameters of the cylinders were 34 14, and 0.085 inches. The investigation was conducted over a frequency range of 0 to 130 cps, an an amplitude range of o 0.165 inches. The surface temperature of the cylinders was varied over a range of 125 to 167 F. Results showed that the effect of vibration on the heat transfer rate for particular cylinder is a function only of the vibration intensity, and that the heat transfer rate is increased over 300 at high vibration intensities. From an interferometer study, the boundary layer is quite complex and goes through several transitions as the vibration intensity is increased. THE BOUNDARY LAYER DOES APPEAR SIMILAR TO THAT OF FORCED CONVECTION A VIBRATION INTENSITIES IN EXCESS OF 12 INCHES SECOND.