Título: | DEVELOPMENT OF TURBULENT VISCOSITY MODELS FOR THE 1D TWO-FLUID MODEL IN VERTICAL ANNULAR FLOW | ||||||||||||
Autor(es): |
MARKUS BALLHAUSEN ARRUDA |
||||||||||||
Colaborador(es): |
ANGELA OURIVIO NIECKELE - Orientador RODRIGO LUIS FORMOSINHO CASTELLO BRANCO - Coorientador |
||||||||||||
Catalogação: | 14/JUL/2023 | Língua(s): | PORTUGUESE - BRAZIL |
||||||||||
Tipo: | TEXT | Subtipo: | SENIOR PROJECT | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
||||||||||||
Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/TFCs/consultas/conteudo.php?strSecao=resultado&nrSeq=63234@1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/TFCs/consultas/conteudo.php?strSecao=resultado&nrSeq=63234@2 |
||||||||||||
DOI: | https://doi.org/10.17771/PUCRio.acad.63234 | ||||||||||||
Resumo: | |||||||||||||
Multiphase flows are frequently encountered in various industries,
such as oil, nuclear, and refrigeration, among others. In numerical
simulations of flows with more than one phase, one of the major challenges
is tracking the phases in the domain, which can be distributed in different
patterns depending on the operational conditions of the flow, fluid
properties, and pipe geometry. The focus of this study is on the vertical
annular pattern, which is characterized by a central gas core flowing at high
velocity, surrounded by a thin liquid film. The One-Dimensional Two-Fluid
Model is used to predict the behavior of two-phase flows and is obtained by
averaging processes over the cross-sectional areas. This requires defining
closure relationships to render the system well-posed. The objective of the
present work is to analyze turbulent viscosity models in vertical annular flow
using the 1D Two-Fluid Model. Three models have been proposed for
investigation. The first is based on the universal logarithmic wall profile, the
second on the velocity profile proposed by Castello Branco (2022), and the
third model considers the characteristic length to be proportional to the pipe
diameter. The obtained results were compared with the literature and
showed that the additional diffusion due to turbulence is beneficial for
rendering the system well-posed and improving agreement with
experimental data regarding film thickness and pressure gradient. However,
turbulent viscosity alone is not sufficient to stabilize all combinations of
superficial velocities, recommending the inclusion of the momentum flux
parameter.
|
|||||||||||||
|