Acoustic and heat transfer characteristics of an impinging elliptical synthetic jet generated by acoustic actuator

Proper cavity shape can mitigate confinement effect in synthetic jet impingement cooling

“…The dimensional parameters related to the experimental study are shown in Figure 2. The details of the instrumentation employed for actuating the synthetic jet and the experimental setup for velocity measurements are reported elsewhere [22,28]. In the present study, the cavity dimensions/shapes are changed but the circular orifice is employed for all the cavities.…”

An experimental investigation on comparison of synthetic and continuous jets impingement heat transfer

“…They also made an investigation for improving the impingement heat transfer by using multiple orifice synthetic jet [19]. Bhapkar et al [20] experimentally investigated acoustic aspects and average heat transfer characteristics of an elliptic synthetic jet impinging on a heated flat plate. A comparison with circular, rectangular and square orifices having same equivalent diameter was also made.…”

“…An 8 mm  1 mm synthetic jet was studied by varying the applied voltage (20-100 V) and frequency (200-600 Hz). Both jets impingement were conducted at several dimensionless jet-to-surface spacings (s/d e = 5, 10,15,20). For the synthetic jet, the best heat transfer was observed at s/d e = 10.…”

Heat transfer of twin-fin piezofan at various orientations and buoyancy levels

“…fice/nozzle, with which the synthetic jets spread more rapidly in the near field region as compared to the pressure-gradient driven conventional jets. With strong correlation between acoustics and heat transfer characteristics for the impinging synthetic jets, the maximum Reynolds number, maximum heat transfer rate, minimum noise level and minimum input power to the piezo-actuator simultaneously develop at the resonance frequency of the jet [8].…”

“…With the synthetic jets issued from the single-slot orifice, the stronger entrainment with more vigorous penetration relative to those from the single-hole orifice resulted in the better thermal performances for the single-slot synthetic jet [8]. For the multiple synthetic jets, the jets from the multi-orifices spread rapidly and merge into a central jet at further downstream locations.…”