Yoshiaki Watanabe

One factor of resonant wavelength shift from onewavelength to two-wavelength resonance in loop-tube-type thermoacoustic cooling system

Results of this study show that the resonant wavelength of the sound generated in a loop-tube-type thermoacoustic cooling system shifts from one-wavelength to two-wavelength resonance during system operation. The effect of the viscous boundary layer upon the resonant wavelength shift is discussed. The viscous boundary layer thickness is always less than the stack channel radius because the loop tube increases the resonance frequency and shifts the resonant wavelength from one-wavelength to two-wavelength resonance, which reduces the influence of viscosity and allows the loop tube to maintain the thermoacoustic self-sustained sound.