A method is presented for the steady-state analysis of universal motors operating under direct or alternating voltage sources, and in the presence of saturation of the iron in the magnetic circuit. The saturation is modelled through a completely general functional dependence of the air-gap flux on the current, thus resulting in a unified treatment for various saturation models. It is shown that...

the simultaneous flow of oil and water in porous media is described by relative permeability curves, mainly derived from laboratory experiments. relative permeability is of paramount importance in predicting reservoir production performance and drive mechanisms and its value depends largely on the volume fraction of fluids present in the test samples. nowadays x-ray scanners are one of the most...