| 摘要 |
<p>A heat-sound wave converting part is provided with a plurality of through-holes that extends in one direction and passes through the heat-sound wave converting part and that is configured so as to form a sound wave propagation path. The heat-sound wave converting part comprises a wall that is formed on the periphery of each through-hole and extends in the direction the through-holes extend and that is configured so as to exchange heat with a fluid. The through-holes include holes with an hydraulic diameter of 0.4 mm or less, and the aperture ratio of the plurality of through-holes in the heat-sound wave converting part is 60% or greater. The thermal conductivity in the heat-sound wave converting part in the fluid environment is 0.4 [W/m/K] or less, and the heat capacity at 400°C in the heat-sound wave converting part in the fluid environment is greater than 0.5 [J/cc/K].</p> |
