RESONANT CONVECTIVE HEAT TRANSFER IN GROOVED CHANNELS

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Abstract
An experimental and numerical study of hydrodynamic resonance and its effect on heat transfer in laminar transversely-grooved channel flows is presented. It is shown that oscillatory perturbation of the steady flow at the frequencies of the most unstable linear modes of the system results in a resonant response, with associated mixing and significant heat transfer enhancement. A theory for natural frequency selection based on linear stability considerations is shown to accurately predict the optimal frequency for transport augmentation. Experimental measurements and numerical calculations demonstrate that a twenty percent flow rate oscillation at the optimal frequency can enhance the heat transfer by more than a factor of two.

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