Abstract
To improve the thermoacoustic cooling performance of loop tube cooling system, the structure of the stack in the prime mover, the energy conversion block from heat energy to sound energy, is focused. In this system, the stack is the most important part and when the gradient of heat flux in it is increased, the strong sound intensity is realized. Copper meshes are attached on top of the honeycomb ceramic stack as the active areas for the heat source to improve the energy conversion from heat energy to sound energy. Because of the copper mesh's heat conductivity is higher than the ceramic's one, the increase of heat flux is realized by multiplying the heat conductivity and the temperature gradient. It is confirmed that the effective gradient of heat flux in the stack becomes steep by using the copper mesh. Experimental results show that the efficiency of the amount of energy conversion is almost doubled by using presented structure of the stack.
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