Effects of ultrasound on micromixing in flow cell

This paper deals with the influence of ultrasound on micromixing in a conti nuous reactor of low reacting volume to confine the ultrasonic energy. A co ntinuous 50 ml-cell was used. Residence time distribution has been determin ed to study macromixing and the Dushman reaction (iodide-iodate) coupled wi th a neutralization has been used as a test reaction to study the local sta te of micromixing. Measured product distributions with unpremixed feeds of differents, flow rates, and viscosities showed the influence of low-frequen cy ultrasonic power on micromixing (20 kHz). The incorporation model couple d with a dynamic model was used to determine the micromixing time in the re actor as a function of the segregation index. Thus these experiments show t hat the characteristic micromixing time can reach a magnitude of 0.001 s. ( C) 2000 Elsevier Science Ltd. All rights reserved.