Calculation of age and local purging flow rate in rooms

The local purging flow rate and the local age in ventilated rooms are numerically investigated; both quantities are calculated in an isothermally ventilated two-dimensional room, the latter in two buoyantly ventilated three-dimensional rooms as well. When calculating the velocity field in the two-dimensional room a new one-equation turbulence model is used. When compared with experimental data the predictions show a satisfying agreement in most cases. The local purging flow rate has not yet been obtained experimentally; calculation of this quantity thus provides useful information of its nature.