The application of local mixing in food industry and biotechnology is demon
strated. Using a Stirring Intensity Measuring Device, SIMD-f3 and SIMD-s1,
specially designed for this purpose, optimum mixing in a bioreactor, loadin
g-flooding transition in the aeration process, and the local mixing level w
ere controlled. The new potentialities of applying an SIMD-type unit offer
its connection with a motor-driven frequence inverter.