Experimental investigation of heat transfer distribution due to impinging synthetic jet

Abstract

The implementation of synthetic jets for use in the cooling of electronics is a relatively new technology. It is well established that effective rates of cooling can be achieved using conventional steady flow impinging jets. However it has been shown that synthetic jets can deliver similar cooling effects without the need for an air supply system and therefore represent an extremely promising alternative for thermal management applications. An experimental investigation has been undertaken to study the heat transfer distribution to an impinging synthetic jet flow. The jet is directed on to a thin SS foil heater, which approximates a uniform wall temperature. Nusselt number profiles generated by the synthetic jet for various driving frequencies and for different distances between heater plate and jet orifice were obtained. It is well established fact that for continuous jets mean heat transfer distributions have a direct relation to jet velocity profiles, however, for synthetic jets, the present investigation shows the fluctuations in local heat flux and strong dependence on the driving frequency