A10 直方体ソノリアクター内の超音波流動場とソノケミカル効率

抄録

We investigated the relation between the sonochemical efficiency and the liquid flow under sonication in a rectangular sonochemical reactor with and without a mechanical stir. We observed ultrasound field in the rectangular sonochemical reactor with the sheeted laser and velocity profiles within the rectangular sonochemical reactor by LDV (Laser Doppler Velocimetry). The reactor consisted of the 490 kHz transducer and the rectangular glass cell of 20 cm×20 cm×65 cm. The experimental set up was shown in Fig.l. All measurements were carried out at room temperature. The increase of revolution of a stir leads to complex asymmetrical cavitation behavior and fluid convection in the reactor. With a mechanical stir, the direction of the flow changed and the average magnitude of the flow velocity was increased remarkably. As the revolution increased, the region showing the sonochemical luminescence expanded and sonochemical efficiency increased up to about 2 times than the value obtained without a mechanical stir. From these results, the suitable construction of the flow field leads to enhance the sonochemical efficiency.