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COBEM 2019
25th International Congress of Mechanical Engineering
ENERGY LOSS IN UNSTEADY TURBULENT FLOWS COMPUTED BY ALTERNATIVE FRICTION MODEL FRAMED ON THEORY OF MIXTURES
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.COBEM2019.COB2019-0868
Abstract
Turbulent fluid transients in pipes occur daily in a diverse range of circumstances in industry Pressure surges during this phenomenon are important to the design and maintenance of the pipe structure. This work argues about an alternative approach to model the unsteady friction framed on the Continuum Theory of Mixtures to compute the pressure fields as well as energy loss of fluid transients. This theory allows the flow to be interpreted as a virtual structured mixture formed by pseudo-constituents, all of them with the same equations of state. The proposed model has its material constants easily determined as they are calculated by the wise use of known steady velocity profiles. Comparison with experimental data makes this model applicable to hydraulic analysis.
Keywords
Transient Flow, Turbulent flow, frequency-dependent friction, transient rate of energy loss
