Effect of vibration on heat transfer from wires in parallel flow

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Virginia Polytechnic Institute

The primary objective of this Investigation was to determine the heat transfer rate and characteristics of three vibrated wires In a parallel flow. A simple experimental apparatus was constructed with which to pursue the investigation, and various results were obtained.

Three wires of different diameters were individually tested in two configurations. One configuration consisted of electrically heated stationary wires which transferred heat to air flowing at various velocities and parallel to the wires. This was investigated to compare the results with previously reported investigations of small cylinders in parallel flow. The second configuration consisted of vibrating wires at various air velocities In parallel flow and at various frequencies and amplitudes.

The results show that for the stationary wires the heat transfer characteristics are In accord In principle with the results of similar investigations.

The results obtained when the wires were vibrated show that vibration in forced convection Increased heat transfer rate up to a certain value of flow Reynolds number after which the effect of vibration on heat transfer was negligible. The effect of amplitude and frequency on the Improvement of heat transfer rate was greater at a particular range of values of frequency and amplitude. As both frequency and amplitude were Increased above this range, the rate of Improvement In heat transfer was not as great.