Abstract
A small-scale standing wave thermoacoustic cooler with a couple of stack and heat exchangers is studied. In addition to classical instrumentation in such a device, thermal heat flux sensors specifically developed using MEMS technology equipped the heat exchangers of this refrigerator. These sensors give the temporal evolution of the heat fluxes through the hot and the cold heat exchangers. Hence, they provide a better understanding of heat transfer between the stack and the heat exchangers. In this work, the temporal evolution of the temperature along the stack and of the heat flux through the heat exchanger is measured versus the acoustic pressure. The results show that for high-pressure levels, the heat flux extracted at the cold exchanger rapidly increases until a maximum value and then stabilizes at a lower value. The origin of this limitation may come from the formation of vortices behind the stack highlighted in the work of Berson et al. [Heat Mass Transfer 44, 1015–1023 (2008)]. This work is supported by ANR (project MicroThermAc NT051_42101).
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