Experimental verification of heat transport by acoustic wave

Heat transfer between two liquid reservoirs maintained at different temperatures and connected to each other by a capillary bundle is known to be markedly enhanced by oscillatory flow in the bundle. In this study, heat transport by an acoustic wave was experimentally investigated. On the basis of the results, a parameter is proposed that expresses the quantity of heat transported by an acoustic wave in order to characterize this phenomenon. This parameter is depended on the normalized channel radius of the regenerator divided by the thermal penetration depth. Furthermore, the effective thermal conductivity is confirmed to increase proportionally to the square of the displacement amplitude. In regard to this point, even when a compressible gas was used as the working fluid, the result was the same as when a liquid was used. (C) 2014 The Authors. Published by Elsevier Ltd.