Effects of dimensional cavity parameters, height, and orifice diameter, on synthetic jet peak velocities are investigated numerically and experimentally, utilizing two piezoelectric composite diaphragms, Bimorph and Thunder ®. The system is modeled using a RNG κ—ε model with a mesh generated using a tri-pave unstructured scheme and the diaphragms are modeled as moving boundaries. The model compares within 15% for a Bimorph but underpredicts the results for Thunder® by more than 30%. For a Bimorph, both cavity parameters are relevant with the orifice diameter having a higher effect. For Thunder® however, only orifice diameter is found to be statistically significant.
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