Hiller R A, Swift G W
Los Alamos National Laboratory, New Mexico 87545, USA.
J Acoust Soc Am. 2000 Oct;108(4):1521-7. doi: 10.1121/1.1289664.
Condensation may occur in an open-flow thermoacoustic cooler with stack temperatures below the saturation temperature of the flowing gas. In the experimental device described here the flowing gas, which is also the acoustic medium, is humid air, so the device acts as a flow-through dehumidifier. The humid air stream flows through an acoustic resonator. Sound energy generated by electrodynamic drivers produces a high-amplitude standing wave inside of the resonator, which causes cooling on a thermoacoustic stack. Condensation of water occurs as the humid air passes through the stack and is cooled below its dew point, with the condensate appearing on the walls of the stack. The dry, cool air passes out of the resonator, while the condensate is wicked away from the end of the stack. Thermoacoustic heat pumping is strongly affected by the form of the condensate inside of the stack, whether condensed mostly on the stack plates, or largely in the form of droplets in the gas stream. Two simple models of the effect of the condensate are matched to a measured stack temperature profile; the results suggest that the thermoacoustic effect of droplets inside the stack is small.
在开式流动热声制冷器中，当堆温度低于流动气体的饱和温度时可能会发生冷凝现象。在此处描述的实验装置中，流动气体同时也是声学介质，为潮湿空气，因此该装置起到了流通式除湿器的作用。潮湿空气流流经一个声学谐振器。电动驱动器产生的声能在谐振器内部产生高振幅驻波，这会在热声堆上导致冷却。当潮湿空气通过热声堆并被冷却至露点以下时，水会发生冷凝，冷凝物出现在热声堆的壁上。干燥、凉爽的空气从谐振器中流出，而冷凝物则从热声堆的末端被吸走。热声热泵受到热声堆内部冷凝物形态的强烈影响，冷凝物是主要凝结在热声堆板上，还是主要以气流中液滴的形式存在。将两种简单的冷凝物影响模型与测量得到的热声堆温度分布进行匹配；结果表明热声堆内部液滴的热声效应较小。
