IRINEU, M. A. F. B.; http://lattes.cnpq.br/3525317821303476; IRINEU, Marcelo Antonio de Figueiredo Benevides.
Resumo:
Monophase fluid flow in irregular pipe has been used in several industrial applications as
transport of petroleum, environmental refrigeration, irrigation, among others. However, many
studies consider flow in regular pipe neglecteding the diffusion terms in the governing
equations. This procedure facilitates the analytical solution of the problem, generating results
physically inconsistent. For contribute in this area of research, this work presents a study of the
monophase flow in irregular pipe including heat transfer, considering all the diffusion terms in
the conservation equations. The governing equations written in the boundary fitted coordinates
system are resolved using the finite volume method using an arrangement of variables colocated,
the UDS scheme as interpolation function to the terms convective, and the method
SIMPLEC for the junction pressure-velocity. As application, the methodology was used to
predict the oil flow in flexible pipe of circular cross section submerged. All the simulations
were accomplished using the computacional code CFX® 3D. Numerical results of the velocity,
pressure and temperature distribution along of the pipe are presented and analyzed. The
pressure, velocity and temperature fields obtained represent with good accuracy the oil flowing
inside the pipe. Starting from the temperature profile was carried out an evaluation of the
zones of paraffin precipitation along the pipe. The study of the distribution of velocity,
pressure and temperature of the oil, inside the pipe will allow to increase the operational
reliability and the useful life of the pipe grid, foreseeing the existence of leaks, obstruction of
the oil flux and minimizing the operational costs.