Abstract
Numerical simulations of heat exchange at the regenerator ot thermoacoustic remgerator have been performed to estimate the heat transfer coefficient between the working gas and wall of remgerator. Simple heat conduction model is proposed in order to simulate the heat exchange between the working gas and refrigerator because the heat exchange phenomenon with sound wave and refrigerator is complex. As a result, average Nusselt number <Nu>^^^→ shows about 8.0 under the dimensionless parameter A { = ωd^2_0 / a) is less than 10, and it is found that the average Nusselt number is approximately expressed as <Nu>^^^→ = 8.0 + 0.07A^<0'8>. Furthermore, one dimensional simulation of thermoacoustic refrigerator is performed using above <Nu>^^^→. The simulation results agree qualitatively with previously reported feature of thermoacoustic refrigerator. However, obtained optimum operating point ω τ shift a bit toward higher value.
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