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We investigate drying clothes using aerial high-power ultrasound. As the moisture content of the clothes changes, so do their acoustic characteristics, their influence on the sound field cannot be ignored. We must design a sound field while understanding and considering their characteristics. In this paper, we studied their characteristics when a 28 kHz ultrasound impinges the cotton fabric (EMPA 221) with different moisture content. As a result, we clarified that the transmitted wave in cotton fabric with moisture contents of 0 and 100% is about 31 and 7%, and these cotton fabrics almost reflects the ultrasound, and forms a standing wave field.
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Asami et al. (2019) studied this question.
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