  A comprehensive study of the problem of modelling vaporous cavitation in
transmission lines is presented. The two-phase homogeneous equilibrium vaporous
cavitation model which has been developed is compared with the conventional
column separation model. The latter predicts unrealistically high pressure
spikes because of a conflict arising from the prediction of negative cavity
sizes if the pressure is not permitted to fall below the vapour pressure, or
the prediction of negative absolute pressures if the cavity size remains
positive. This is verified by a comparison of predictions with previously
published experimental results on upstream, midstream and downstream
cavitation. The new model has been extended to include frequency-dependent
friction. The characteristics predicted by the frequency-dependent friction
model show close correspondence with experimental data.
