01.2020.100.104

STUDY ON MOISTURE STACK FOR LOW-TEMPERATURE – OSCILLATION OF THERMOACOUSTIC SYSTEM-EFFECTS OF STACK LENGTH ON OSCILLATION TEMPERATURE AND SOUND PRESSURE –

Author(s):
Daichi Kuroki†*, Shin-ichi Sakamoto††, Riku Onishi‡, Yuto Kawashima‡, Yuya Kurata‡, Kazuki Shiraki‡, & Yoshiaki Watanabe†

Affiliation(s):
†Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan

‡Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan

††Department of Electronic Systems Engineering, University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan

*Corresponding Author Email: ctuc1014@mail4.doshisha.ac.jp

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The conversion of heat and sound in a thermoacoustic system is performed in the region with temperature gradient. It is known that, when water is added to the stack, a low temperature oscillation is realized and the output with the same level as that of a dry stack can be obtained. The expansion of the effective stack area which contributes to the thermoacoustic conversion induced by the addition of water is assumed as its cause. In this report, the influences of the change of the stack length in the wet condition on the oscillation temperature and on the output sound pressure are experimentally investigated. As the result, it is found that the oscillation temperature does not depend on the stack length while the output sound pressure depends on the stack length. This occurs because the temperature in the stack gradually creates a linear gradient between both ends under the influence of water and its producing vapor.