On a Relationship Between Certain Zone Models of Two Layer and Uniform Compartment Fires

Abstract

Fires, especially fully-developed fires, are often idealised as having a uniform temperature and gas concentrations whilst growing pre-flashover fires are commonly idealised as having two gas phase layers. With suitable simplifications the equations of a particular simplified one layer i.e. one uniform gas phase model have been adapted by redefining the terms so as to describe a suitably defined two layer model. The uniform model is thus shown to be a special case of a more general two layer model for which many of the modes of behaviour already discussed might also apply.