Novel Control-Oriented Models for Liquid Transport in Falling Film Evaporator Tubes

Preliminary Experiences with a Falling - Film Evaporator Pilot Plant

The performance of a falling-film evaporator trial plant during the first year after installation at the CG Smith Sugar Illovo mill is described. Operating under conditions similar to those experienced in the mill's raw house first effectevaporator, the unit confirmed most of the reported characteristics of this type of plant and proved easy to operate. Problems experienced were associated most...

Simulation of flat falling film evaporator system for concentration of black liquor

In the present investigation, a nonlinear mathematical model is developed for the analysis of Septuple effect flat falling film evaporator (SEFFFE) system used for concentrating weak black liquor in a nearby paper mill. This model is capable of simulating process of evaporation considering variations in boiling point rise (), overall heat transfer coefficient (U), heat loss from evaporator (Ql...

nonlinear modeling and cascade control design for multi effect falling film evaporators

Flow Patterns and Mode Transitions for Falling-Film on Flat Tubes

The transitional Reynolds numbers for different patterns are available and a proposed transitional map is also provided in this paper. The transition of falling-films on flat tubes is studied in this work. Water and ethylene glycol are used as working fluids, for falling-film experiments conducted under adiabatic conditions, without an imposed vapor flow. The flow patterns are recorded using a ...

Mathematical models for motile bacterial transport in cylindrical tubes.

Mathematical models considering motile bacterial transport within a geometrically restrictive cylindrical tube were developed. Two macroscopic transport parameters, the random motility coefficient as a self-diffusion coefficient of the cell population and the chemotactic velocity as a chemical-induced velocity, were derived. The three-dimensional cell balance equation was reduced to forms simil...