Estudo da ascensão de um fluido em um cilindro rotativo

Abstract

This work was developed with the aim of conducting a study on the rise of a fluid in a rotating cylinder, using computational fluid dynamics for comparison with the analytical result. The influence of the cylinder’s rotation speed, surface tension coefficient, dynamic viscosity of the dispersed phase, and contact angle on the behavior of the interface in this type of flow was analyzed. The methodology was divided into physical model, which details the simplifying assumptions considered, mathematical model, in which the analytical solution to the problem was developed, and computational model, which details the parameters and methods used in the numerical-computational simulations. The Ansys Fluent software, with the volume of fluids method, and the MFSim software, with the volume of fluids and immersed boundary methods, were used. The results obtained through the numerical-computational simulations were compared with the analytical solution. The influence of the interfacial tension coefficient and contact angle on the flow was explained through the effects of cohesive and wettability forces. The lowest relative error, compared to the analytical solution, was around 4 % for an interfacial tension coefficient of 0.001 N/m and a contact angle of 90◦ , reaching 30 % for an interfacial tension coefficient of 0.1 N/m and a contact angle of 150◦ .