Abstract
Thermoacoustic phenomenon is the energy conversion between heat and sound. At the prime mover of thermoacoustic system, temperature difference between the heater and environments is converted to the acoustic wave. But there are unclear points in the process of the energy conversion from heat to sound. To understand how this occurs, self-excited oscillation between parallel plates is visualized with CW laser and high-speed camera. The relation of the fluctuation of pressure, velocity and displacement are revealed from the view point of fluid dynamics by visualizing in flow channel parallel-plate stack with Particle Imaging Velocimetry (PIV).
