Prediction of the time evolution of pH in meat.

In this paper we compare experimental data on pH decline in carcasses and predictions using a model, based on earlier work of Vetharaniam and coworkers. This model is extended in order to cope with the varying temperatures in the slaughterhouse. We have measured initial glycogen, and the pH and temperature at multiple times in the production chain. We have obtained good comparison between model predictions and our measurements. Furthermore, the correlation between initial glycogen content and ultimate pH as predicted by the model, follows closely experimental data reported earlier in literature. Being able to predict pH decline and ultimate pH, one can obtain reliable indications of final meat quality.

Model for particle migration in bidisperse suspensions by use of effective temperature.

A model for the particle migration in a bidisperse flowing suspension is proposed and compared to experimental data. A mixture formulation, describing the suspension velocity and pressure and the concentrations of two solid fractions is derived from a multi-fluid model. In the multi-fluid model the liquid phase and both dispersed phases are interpenetrating phases. The closure relations are based on a mean field approach extending closure relations of a monodisperse suspension. The model is used to predict segregation based on particle size in channel flow where the particles are subjected to Brownian motion and shear-induced migration. The comparison of the model results with experimental data shows that particle migration is predicted well by the given formulation.

Effective temperature for sheared suspensions: a route towards closures for migration in bidisperse suspension.

By extending the concept of an effective temperature, earlier introduced for sheared monodisperse suspensions, we propose a continuum theory for sheared bidisperse suspensions. We show the theory for sheared suspensions can be constructed from the theory for Brownian suspensions by replacing the temperature with the effective temperature. Furthermore, we explore the validity of closure relations based on mean field/free volume theory, by comparison with experimental data obtained for Brownian bidisperse suspensions. In a recent paper, we have shown that the new theory, combined with the discussed closure relations, is indeed a predictive theory.