Abstract
This paper describes the fundamental investigations for developing new technology using cavitation bubbles, microbubbles and pressure waves. The absorbance change of the aqueous solution of methylene blue was examined to quantify water treatment efficiency. Also, influence of cavitation bubbles and micro bubbles on the efficiency of methylene blue were examined. In addition, the influence of pressure waves on cavitation bubbles was investigated. As the result, it was found that (1) the efficiency was decreased by adding microbubbles to cavitation bubbles, (2) the efficiency in the cavitation flow depends on the quantity of cavitation bubbles, (3) by working pressure waves on cavitation flow, the collapsing pressure becomes larger, and the frequency of collapsing bubbles becomes higher.
