Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : December 04, 2021
A self-circulating heat exchanger is a device that connects a heat source and a high-temperature heat exchanger with a loop tube and generates acoustic streaming, a steady flow, in the loop tube. The word “self-circulating” means that the gas inside the heat exchanger is flowed by a thermoacoustic spontaneous gas oscillation. It is important to establish a design guideline for the self-circulating heat exchanger because the method to efficiently generate the circulating acoustic streaming has not yet been clarified. Therefore, the purpose of this study is to clarify the relationship between the mass flow rate of the acoustic streaming and the temperature. An experimental apparatus was constructed, in which external gas oscillation input from a loudspeaker is used instead of a thermoacoustic spontaneous gas oscillation. To accelerate the acoustic streaming, an acoustic streaming generator was installed in the loop tube with multiple holes to narrow the flow path. Since it is difficult to measure the mass flow rate directly, it was obtained indirectly by using the heat balance between the acoustic streaming generator and the working fluid. The mass flow rate obtained from the experiment showed that the mass flow rate was constant in the temperature range of 60 to 140℃.
