COMPUTER-SIMULATION MODEL OF A NAUTA MIXER

This paper reports the development of a computer simulation programme for an orbiting screw, or Nauta mixer, in which convection is dominant . It is based on a volume-element model and a priori knowledge of the process, and yields a complicated higher order linear differential equ ation representing this continuous dynamic system. The equation was so lved numerically using a computer simulation programme. The reliabilit y of the model has been verified by means of a radiotracer response su rvey. The results indicate the validity of the programme and demonstra te that it can be used to predict mixing time, analyse the mixing proc ess and improve mixer design. In principle, the programme in its prese nt form is useful for scaling-up.