Suscripción a Biblioteca: Guest
Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

MECHANISM OF DISSIMILAR MOMENTUM AND HEAT TRANSFER INDUCED BY A TRAVELING WAVE-LIKE BLOWING/SUCTION IN TURBULENT CHANNEL FLOW

pages 1-6
DOI: 10.1615/TSFP7.1170
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SINOPSIS

The suboptimal control theory is applied for achieving dissimilar control of enhancing heat transfer, while keeping the skin friction not increased considerably in a fully developed channel flow. The Frechet differentials clearly show that the responses of velocity and temperature fields to wall blowing/suction are quite different due to the fact that the velocity is a divergence-free vector while the temperature is a conservative scalar. This essential difference allows us to achieve dissimilar control even in flows where the averaged momentum and energy transport equations have the identical form. It is also found that the resultant optimized mode of control input exhibits a streamwise traveling wave-like property. By exploring the phase relationship between the traveling wave-like control input and the velocity and thermal fields, we reveal that such control input contributes to dissimilar heat transfer enhancement via two different mechanisms.

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