Abstract
The thermoacoustic sound wave generator plays an important role in the thermoacoustic equipment. The stack, which are set in the resonance tube, is necessary for the thermoacousitc sound wave generator to converse energy from heat to work, and vice versa. Stack size effects on the performance of thermoacoustic sound wave generator are discussed. Optimum stack size, which was experimentally ensured for air of the working fluid, is reexamined by thermal and viscous penetration depths. As a result, it is ensured that its optimum size corresponds to the tube inner radius which is almost equal to twice times the size of thermal penetration depth. Five kinds of working fluids at different temperatures are employed for estimating the optimum tube inner diameter of stack. Their sizes have to be changed in on condition that the thermoacoustic sound wave generators are driven.
