Abstract
The beam shape of a piezo-fan and the inlet turbulence intensity (TI) of channel flow are important parameters that affect the heat transfer enhancement of a heated surface in an airflow channel with a vibrating piezo-fan. In this study, 3D numerical channel models of different piezo-fans are considered when investigating the influence of beam shapes and inlet turbulence intensity on the heat transfer performance of channel flow, within a range of 4000–30,000 Reynolds numbers (ReCF) and 5% to 20% inlet turbulent intensity (TI). The influence of these parameters is analyzed in terms of the distributions of the flow field, time-averaged heat transfer coefficient, and overall thermal performance. The results show that the piezo-fans with the widest rectangular shape and a convergent shape behave better in terms of overall thermal performance in the channel. However, as the turbulence intensity increases to 20%, the difference in heat transfer caused by the beam shape becomes negligible. The maximum overall thermal performance parameter (η) = 1.47 is obtained at ReCF = 13,000 and TI=20% for the convergent beam shape (Beam-E).
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