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Modelling of Two-Phase Flows with Modelica

Bauer, Olaf (1999) In MSc Theses
Department of Automatic Control
Abstract
Modelica-TM is an object-oriented language for modeling physical systems that was designed in the last years with the goal to become a standardized multi-domain modeling language. This paper describes a robust model for homogenous and inhomogenous two phase flows with dynamic or static slip correlation. It was developed in the context of developing a Modelica base library for thermo-hydraulic applications. The model describes the transient behaviour of a fluid moving through a pipe during a phase change caused by heat transfer or pressure changes. Measurements from a refrigeration cycle were used to validate the model. Physical approaches were taken to model friction and momentum exchange between the phases. Specialized thermodynamic... (More)
Modelica-TM is an object-oriented language for modeling physical systems that was designed in the last years with the goal to become a standardized multi-domain modeling language. This paper describes a robust model for homogenous and inhomogenous two phase flows with dynamic or static slip correlation. It was developed in the context of developing a Modelica base library for thermo-hydraulic applications. The model describes the transient behaviour of a fluid moving through a pipe during a phase change caused by heat transfer or pressure changes. Measurements from a refrigeration cycle were used to validate the model. Physical approaches were taken to model friction and momentum exchange between the phases. Specialized thermodynamic equations of state were developed in order to improve the simulation speed. The model also includes the one-phase flow of liquid or vapor as limiting cases in order to make the simulation of a complete phase-transition possible. The model is numerically robust in all flow regions. Modelica's language features are used to structure the code for reusability in different context. These features make the model well suited for a reusable model library. (Less)
Please use this url to cite or link to this publication:
author
Bauer, Olaf
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
MSc Theses
report number
TFRT-5629
ISSN
0280-5316
language
English
id
8848488
date added to LUP
2016-03-24 11:17:30
date last changed
2016-03-24 11:17:30
@misc{8848488,
  abstract     = {Modelica-TM is an object-oriented language for modeling physical systems that was designed in the last years with the goal to become a standardized multi-domain modeling language. This paper describes a robust model for homogenous and inhomogenous two phase flows with dynamic or static slip correlation. It was developed in the context of developing a Modelica base library for thermo-hydraulic applications. The model describes the transient behaviour of a fluid moving through a pipe during a phase change caused by heat transfer or pressure changes. Measurements from a refrigeration cycle were used to validate the model. Physical approaches were taken to model friction and momentum exchange between the phases. Specialized thermodynamic equations of state were developed in order to improve the simulation speed. The model also includes the one-phase flow of liquid or vapor as limiting cases in order to make the simulation of a complete phase-transition possible. The model is numerically robust in all flow regions. Modelica's language features are used to structure the code for reusability in different context. These features make the model well suited for a reusable model library.},
  author       = {Bauer, Olaf},
  issn         = {0280-5316},
  language     = {eng},
  note         = {Student Paper},
  series       = {MSc Theses},
  title        = {Modelling of Two-Phase Flows with Modelica},
  year         = {1999},
}