ABSTRACT
Synthetic jet measurements present numerous challenges. The flow is highly unsteady, requires a large dynamic range, and contains regions of high vorticity and high shear. This chapterwill discuss various approaches tomakingmeasurements in these challenging flow fields. Since any experimental study of synthetic jets must start with quantification of its flow parameters, this chapter will start with an introduction to the definitions of important flow parameters and scaling of a synthetic jet flow.The wide range of devices used to generate synthetic jets in liquids and gasses will be reviewed. Some flow visualization techniques that have been employed to learn about synthetic jets will then be discussed. Subsequently, we will detail ways to address the measurement challenges mentioned in Chapter 1 using traditional methods, such as hotwire anemometry (HWA), as well as unobtrusive techniques involving seed particles, such as laserDoppler anemometry (LDA), also called laser Doppler velocimetry (LDV), and particle image velocimetry (PIV).
