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In the present work a biphasic flow study of the RH degasser was carried out in physical models. The mathematical modeling was made using the Eulerian approach. The influence of different non-drag forces was studied, such as: turbulent dispersion force, wall lubrication force and lift force. In the study, the mathematical modeling was used to determine the circulation rate in the physical model of the RH degasser of USIMINAS in the 1:5 scale. For the validation of the mathematical model, tests were made in the physical model using techniques to obtain homogenization time of salt solutions. The flow monitoring was done by using ordinary camera and high-speed camera. It was determined that the non-drag forces have influence on the two-phase flow (air/water) and the combined forces of turbulent dispersion, wall lubrication force and lift force lead to best results, when compared with the experimental results. Non-drag forces were determined to influence the air / water two-phase flow, the combination of turbulent dispersion, wall lubrication and lifting forces having the best results compared to the experimental results. [ABSTRACT FROM AUTHOR]