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ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336
Indexed in
FLOW ANALYSIS OF THE IMPINGEMENT OF A VARIABLE-DIAMETER SYNTHETIC JET
Краткое описание
Synthetic jets have been used for impingement heat transfer in compact electronics cooling. A novel form of synthetic jet uses a time-varying diameter, which can produce increased momentum flow and heat transfer when compared to fixed-diameter devices with the same average size, De. This benefit was most significant over an axial range relatively close to the exit, corresponding to nondimensional positions, x/De, from 1 to 3. Particle image velocimetry (PIV) was applied to examine the flow mechanisms behind this behavior, using both time-averaged and phase-averaged analysis. In the time average, the variable-diameter jet produces a concentrated jet with more significant entrainment, exceeding its fixed-diameter counterpart by a factor of nearly four. Over the actuation cycle, phase-averaged flow fields display a larger, more concentrated vortex ring, which increases the maximum speed, vorticity, and circulation. The vortex ring travels across the impingement distance nearly twice as fast with a variable diameter, though, so it only has an effect during a brief portion of the actuation cycle. This indicates that the device position must be selected carefully, as its benefits will be most significant when placed close to the target.
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