![]() To understand the hydrodynamics of this kind of systems, an experimental investigation should be carried out. Therefore, research on the influence of the geometry and velocity of the rotating solid has to be performed. Consequently, the hydrodynamics of the whole confined volume change. It was found that high velocities of the rotating solid induce the formation of an air bubble around the solid. In some cases, a low rotation speed of the solid is needed, while in others a higher rotation provides the necessary conditions to achieve the given purpose. Īt the same time, the rotating speed of the solid has an important role in the process. Before taking the decision to use any given geometry, there should be a careful and thorough study of the hydrodynamics in the confined volume. But, most of these modifications were based on the results obtained by the process itself and not by the investigation of the phenomenon. Thus, the geometry of the solid has been changed to fulfill the specific requirement of a process. The interaction of the fluid with the rotating solid is an essential factor that determines the whole process. To characterize the flow pattern, among other variables, three relevant parameters on the process have been identified: the distance ratio between the solid and the walls of the confined volume, the geometry of the cylinder, and the rotating speed. ![]() The hydrodynamics in the confined volume of this kind of systems present a highly turbulent flow. IntroductionĪ system with a rotating solid in a confined volume is common in several industrial processes, like mixing, electrochemistry, and others. ![]() The model with the inverted truncated cone tip presented better stability in the fluid flow pattern along the rotation speed range. Numerical results were compared with physical experiments for validation. The biphasic and turbulence constitutive equations were solved with the Computational Fluid Dynamics technique. The process makes experimental observation difficult. As the rotation speed increased, the turbulent regions were placed together and moved. It was also used to identify two different flow regimens in physical and numerical results. This procedure was used to determine the nonlinear fluid flow pattern. In addition, the scalar kinetic energy and the time series were calculated to perform the normal probability plot. The Line Integral Convolution Method was used to obtain the fluid motion at the plane. The experimental technique used a visualization cell and a Particle Imaging Velocimetry installation to obtain the vector field at the central plane of the volume. ![]() Two of the models were modified at the lower region, also known as tip section, by means of inverted and right truncated cone geometries, respectively. s −1) to obtain the fluid flow pattern in nonsteady conditions.Three cylinder-based geometries were evaluated at five different rotating speeds ( = 20.94, 62.83, 94.25, 125.66, and 157.08 rad ![]()
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