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Visualization of the Thermoacoustic Effect

Temperature field in the stack region of the thermoacoustic refrigerator visualized using holographic interferometry. Top left image: full compression in the acoustic cycle – heat flows from the fluid into the stack plate. Bottom right image: full expansion of the acoustic cycle. Former graduate Student Martin Wetzel and Prof. Cila Herman visualized and measured heat transfer in the stack region of a thermoacoustic refrigerator in a project sponsored by the Office of Naval Research.