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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
A numerical and experimental study of the pressure transmission in viscoplastic fluids confined in pipelines
Submission Author:
Rodrigo Seiji Mitishita , PR
Co-Authors:
Gabriel Merhy de Oliveira, Cezar Otaviano Ribeiro Negrao, Rodrigo Seiji Mitishita
Presenter: Rodrigo Seiji Mitishita
doi://10.26678/ABCM.COBEM2017.COB17-1540
Abstract
The transmission of pressure applied at the inlet of a closed pipeline filled with a yield stress (or viscoplastic) fluid is investigated in a laboratory-scale experiment. The experimental setup consists of a pump-driven flow loop installed inside a thermally controlled chamber. While the pump pressurizes an aqueous Carbopol solution into a 48.3m helical pipeline closed at the outlet, the pressures are measured and recorded. In contrast to Newtonian fluids, the results indicated that the pressure imposed to a viscoplastic fluid is not fully transmitted along the pipeline. This non-transmission of pressure is related to the fluid yield stress. The experiments are used to validate the mathematical model from Oliveira and Negrão (2015) for the pressure transmission problem in a yield stress fluid. Numerical results for the fluid pressure are within a 5% error band when compared to experimental results, indicating a good agreement.
Keywords
yield stress fluid, pressure transmission, experimental rig
