Abstract
The acoustic power gain of differentially-heated regenerators was measured as a function of frequency. When the ceramic honeycomb was used as a regenerator, it was found that the acoustic power gain can be numerically calculated by using the capillary-tube-based theory in which the regenerator was modeled as an array of cylindrical tubes. However, when stacked-screen meshes were used as a regenerator, the calculated gain did not agree with the experiment one.
