水モデルにおける超音波振動ノズルによる気泡微細化と気-液間反応促進のメカニズム

概要

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In the previous paper, it has been shown that the bubbles in water are disintegrated and the gas-liquid reaction is accelerated by applying ultrasonic vibration to the injection nozzle. In the present paper, the mechanisms of bubble disintegration and reaction acceleration have been discussed by examining bubble dispersion phenomena with the aid of electroresistivity probe and CO_2 absorption experiment. The results were summarized as follows ; (1) The bubble dispersion zone was not changed by applying ultrasonic vibration. The bubble rising velocity did not increase so much. The mean bubble diameter decreased to one half of that without ultrasonic vibration. (2) The gas column was formed in front of nozzle top by applying ultrasonic vibration. The surface of gas column vibrated violently. The fine bubbles were formed from the surface. (3) Acceleration of CO_2 absorption could not be simply explained by the increase in interfacial area caused by bubble disintegration. Absorption was also accelerated at the nozzle top, because of the violent vibration of gas column surface. (4) Bubbles were disintegrated finer and CO_2 absorption rate was larger as the power of ultrasonic vibration increased.
社団法人日本鉄鋼協会の論文
1992-05-01