The Agglomeration of Aerosol by Sound Wave

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  • 音波による煙霧質の凝集に関する実験
  • オンパ ニ ヨル エンムシツ ノ ギョウシュウ ニ カンスル ジッケン

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Sonic agglomeration of aerosols (tabacco smoke and NH_4 Cl smoke) was investigated in progressive and standing sound wave fields of frequency ranging from 0. 5 to 10 kcs/sec in a glass tube. Falling time was determined by measuring the intensity of the transmitted light in the natural state and in sound fields. At the same time, microscopic examination of the particle size was made on samples collected on glass plates. It was revealed that the particle size of the collected samples increased as the falling time decreased or vise versa, both in the natural state or in sound fields. Sound waves shortened the falling time appreciably, and the effect became greater, as the sound pressure was increased. Optimum frequency was observed for each species of the aerosols according to their particle sizes. This optimum frequency was almost independent of the sound pressure and the concentration of the aerosols. The effect was nearly the same in standing waves as in the progressives, provided the sound energy density was common in both cases.

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