It is possible to make use of simple low-temperature models to elucida
te the transport processes that occur in a Hall-Heroult cell. While th
e models differ from the actual processes in terms of temperature and
physical properties, the relationship between the model and the actual
process may be related via a study of the principle of similarity. Th
e following gives a brief description of the relevance of dimensionles
s groups in the use of physical models, followed by some experience wi
th the use of physical models in the study of gas-induced fluid flow a
nd heat/mass transfer in a Hall-Heroult cell.