Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
ON THE WATER HAMMER IN ELASTO-VISCOPLASTIC PIPES
Submission Author:
DOUGLAS MONTEIRO ANDRADE , RJ , Brazil
Co-Authors:
DOUGLAS MONTEIRO ANDRADE, Felipe Bastos de Freitas Rachid
Presenter: DOUGLAS MONTEIRO ANDRADE
doi://10.26678/ABCM.ENCIT2022.CIT22-0254
Abstract
This paper presents an extension of the water hammer analysis to include the elasto-viscoplastic behavior of the pipe material. To accomplish this goal, first, a recently validated 2D unsteady fluid flow model is applied as the basic framework. Then, the elasto-viscoplastic behavior of the pipe material is incorporated according to an internal variable constitutive theory. The proposed model results in a nonlinear hyperbolic system of partial differential equations whose solution is approximated by using the method of characteristics followed by a Newton-Raphson method. Taking as reference the transient responses obtained from a classic reservoir-pipe-valve installation at a high-temperature environment, the proposed model limits the pressure fluctuations compared to those found by the modeling that disregards the elasto-viscoplasticity. Such behavior can be implied by the plastic yielding and creep found in the pipe material.
Keywords
Unsteady Flow, Elasto-viscoplasticity, Internal Variables, energy dissipation, Thermodynamics
