Hybrid Synthetic Jet Actuator Seminar & Report

Actuators
based on the synthetic jet idea are currently becoming of increasing importance for a number of applications, especially involving control of flow separation and/or transition to turbulence in internal or external aerodynamics. They are much more practical and less sensitive to mechanical damage than the initially proposed actuators influencing the flow by mechanical tabs or vanes extended from the wall into the flow. They are also finding use in applications aimed at extremely high power density convective heat and mass transfer between fluid and walls
Synthetic jets are formed by a periodically alternating inflow into and outflow

from a nozzle., mainly with the perspective of using their rectification properties in fluidic pumping. They were called ―synthetic jets‖ the term suggesting their being ―synthesised‖ from individual vortex rings, although this character is there only in a certain range of operating conditions. Synthetic jet actuators are a particularly attractive idea in the context of small scale, microelectromechanical systems (MEMS) because scaling down is usually associated with decreasing Reynolds number, which decreases efficiency of mixing as well as of convective heat transfer in steady flows. The pulsation associated with of the synthetic jet flows agitates the flowfield and produces effects similar to those of turbulent convection. There are, in fact, some experimental data suggesting that synthetic jets are capable of achieving extreme magnitudes of the thermal power transfer density, unobtainable by any other means, because the pulsation can destroy or reduce the thin insulating layer of stagnant fluid, held at the wall in steady flows. In spite of its minute thickness, this layer has the essential limiting influence on the achievable heat transfer rate, because heat has to cross it by the very ineffective conduction mechanism



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