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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Effects of the Bulk Viscosity Coefficient in Unsteady Pipe Flow
Submission Author:
André Luís Peixoto Considera , RJ , Brazil
Co-Authors:
André Luís Peixoto Considera, Felipe Bastos de Freitas Rachid
Presenter: André Luís Peixoto Considera
doi://10.26678/ABCM.ENCIT2020.CIT20-0318
Abstract
The present study aims to investigate the effects of the bulk viscosity coefficient in unsteady pipe flow. To this end, a one-dimensional water-hammer model taking into account the bulk viscosity coefficient is developed by introducing its effects in the mass and momentum equations. The governing equations are solved by the method of characteristics (MOC) in a reservoir-pipe-valve system with transient generated by sudden valve closure. The effects of the bulk viscosity coefficient are numerically investigated regarding the pressure response as well as the energy dissipation. Results indicate that large values of the bulk viscosity coefficient lead to an increase in the pressure wave period. Moreover, the energy dissipation due to the bulk viscosity occurs in the form of high intensity peaks, easily exceeding the dissipation due to wall shear when large values of the bulk viscosity coefficient are considered.
Keywords
Unsteady Pipe Flow, Bulk viscosity, energy dissipation
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