ABSTRACT
The basic logic behind length scale models is that the variables involved with the forces taking part in the mixing process can be arranged in groups that have the dimensions of length. The magnitude of these length scales indicate how important a particular process is. Ratios of these length scales form dimensionless groups that can be used in scaling the results of laboratory studies to full-sized field processes such as Reynolds number is used in frictional flow. Experiments are performed in the laboratory over a range of variables that cover the expected range in the field. The results of these experiments are used to determine empirical relations between the dimensionless groups. These relationships can then be used to predict the behavior of similar configurations in the field. The advantage is that the equations are easy to evaluate and often include physical effects.
