TED-AJ03-284 EFFECT OF ASPECT RATIO ON IMPINGEMENT HEAT TRANSFER WITH TONE-EXCITATION

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Previous studies of free and impingement jets related predominantly to those from circular nozzles. Recently, attention to three-dimensional non-circular jets has risen significantly, because of the peculiar phenomena such as "axis-switching" and theis potential to provide increased mixing rate relative to the circular jet. In this report, the effect of aspect ratios (AR=1-8) on the heat transfer characteristics with and without the tone-excitation (its frequency is 50Hz (Const.)) impinged by an elliptic air jet has been studied experimentally at Re=5×(10)^4. [figure] Planar effect on the pressure field and heat transfer characteristics is shown as the iso-Cp maps and iso-Nu maps in Figs. A-1 and A-2,respectively. It is shown that for a large aspect ratio, Cp and Nu on the target plate under the tone-excitation added from the minor axial direction have a small value and their profiles became flat, but those from the major axial direction do not vary such as those in the case of without tone-excitation. It is also shown that The location of "axis-switching" tends down-stream with the increase of AR. [figure]
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