Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Flows with Cavitation of Biodiesel in Pipelines
Submission Author:
Elias Dias , RJ , Brazil
Co-Authors:
Elias Dias, Helcio Orlande, Italo Madeira, Marcelo Colaco
Presenter: Elias Dias
doi://10.26678/ABCM.COBEM2023.COB2023-2409
Abstract
Transient flows with cavitation are of great importance in the transport of fuels through ducts. A problem related to cavitation is that the phenomenon leads to high pressure waves which can damage the pipeline system. Fossil fuels may cause several problems to the environment, such as air pollution and emission of greenhouse gases, which contribute to global warming. Biofuels are a viable alternative to partially replace fossil fuels. This work aims at the implementation of a computer code for the simulation of transient flows with cavitation of biofuels in ducts. The model used here was one-dimensional and involved a homogeneous mixture. The numerical solution was obtained with the finite volumes method, where the FLIC and WAF-TVD numerical schemes were compared for the solution of the resulting homogeneous system of partial differential equations. In addition, the Euler, Runge-Kutta and Bulirsch-Stoer methods were compared for the solution of the non-homogeneous system of ordinary equations. The obtained results revealed that the FLIC scheme combined with the Bulirsch-Stoer method resulted in solutions with small oscillations that originated from the cavitation. Our solution of the model was verified with literature results in a simple duct and validated with experiments, using water, performed in the Technological Center of Ducts (CTDUT) located in Rio de Janeiro which has a two kilometers complex duct with elevations. The model showed good results in the validation, presenting good agreement with the experimental data. After verification and validation, simulations were performed with biodiesel as transported fluid in order to compare the results using this biofuel and water. The results revealed that the pressure peaks during cavitation are higher for water than biodiesel for similar conditions. The simulation also analyzed the behavior of the void fraction during the cavitation. Most works in literature simulate cavitation using only water, this work is very important because it showed the phenomenon in the presence of a very important biofuel.
Keywords
Cavitation, Finite Volumes, Biofuels, Transient flows
