ABSTRACT
In this work three mathematical simulation models for different paper dryer processes resulting in non-linear ordinary differential equations as well as partial differential equations with different levels of complexity will be presented. The processes discussed are multi-cylinder paper dryers, condensate entrainment and condensate flow inside steam heated drying cylinders. The mathematical models presented in this work are based on a systematic analysis of the physical phenomena occurring in the paper dryer. and modelling the processes is a matter of correctly describing the transport processes involved. The numerical techniques used to solve these differential equations cover the Runge-Kutta method with adjustable step length, finite difference formulas and extensive schemes for computational free surface flow. Further the numerical results are validated against experimental data.
