Abstract
The object of this paper is to study the improvement of performance in a looped-tube-type thermoacoustic cooler with branch resonator by additional bypass-looped tube with stack as the double loop-tube-type thermoacoustic cooler. By measuring the pressure in the tube using two-sensor method and numerical simuration using FDTD method, pressure, particle velocity, and phase difference were made clear in relation to the stack structures. The calculated results showed the traveling wave component increased in the original looped tube by connecting bypass-looped tube. The higher cooling performance of the double loop thermoacoustic cooler was indicated experimentally in comparison with the single looped type.
