Abstract
Transient temperature measurements were made to determine the Nusselt number for both normal and parallel air flow over cylinders. The cylinders were fine polymer fibers, and the temperatures were determined with an infrared camera. The experimental results for normal flow agree with the well-established correlation of McAdams. For parallel flow, the results lie between the predictions of previous researchers. Unlike the work described herein, previous investigators used equilibrium conditions as a basis for determining Nusselt numbers. Our transient measurements showed that the Nusselt number is not strongly dependent on the transient character of temperature difference.
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