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Projects / Programmes source: ARIS

Simulations of stratified and slug flows

Research activity

Code Science Field Subfield
2.13.00  Engineering sciences and technologies  Process engineering   

Code Science Field
T160  Technological sciences  Nuclear engineering and technology 
Keywords
stratified two-phase flow, slug flow, interface tracking model, two-fluid model
Evaluation (rules)
source: COBISS
Researchers (9)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  21538  PhD Robert Bergant  Energy engineering  Junior researcher  2004 - 2005  42 
2.  23083  PhD Janez Gale  Process engineering  Junior researcher  2004 - 2007  75 
3.  05570  PhD Ivo Kljenak  Energy engineering  Researcher  2004 - 2007  466 
4.  24075  Tanja Klopčič    Technical associate  2004 - 2007 
5.  14572  PhD Matjaž Leskovar  Energy engineering  Researcher  2004 - 2007  434 
6.  21181  Zoran Petrič  Energy engineering  Researcher  2004 - 2007  15 
7.  08661  PhD Andrej Prošek  Energy engineering  Researcher  2004 - 2007  599 
8.  19725  Andrej Sušnik    Technical associate  2004 - 2007 
9.  12057  PhD Iztok Tiselj  Energy engineering  Head  2004 - 2007  467 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  90,600 
Abstract
Three-dimensional simulations of horizontal stratified and horizontal slug flow in the pipes are foreseen. Simulations will be performed with "in-house" computer codes and with a computer code CFX. Numerical method that enables explicit tracking of the inter-phase surface - Volume-Of-Fluid - will be used. Interface between two fluids in horizontal stratified flow is stable as long as the difference between the bulk velocities of the lighter and heavier phase remains sufficiently small. As the relative velocity is increasing, the critical value is reached, where the surface becomes unstable (Kelvin-Helmholtz instability). Growth of the surface waves changes the flow into "horizontal slug flow regime". Our simulations will describe horizontal stratified and horizontal slug flow regimes and transition between both flow regimes. Goals of the simulations are simplified models, which can be used as closure relations in less accurate two-fluid models of two-phase flows: - simplified model of inter-phase friction in horizontal stratified flow, - simplified model of transition between the horizontal stratified and horizontal slug flow, - and simplified models of inter-phase friction in horizontal slug flow. In the second phase of the project we plan to simulate the horizontal stratified flow, the horizontal slug flow, and transition between both flow regimes in the presence of the condensation or vaporization. The goals of the simulations are again simplified models of the inter-phase exchange of mass, momentum and heat: - models of inter-phase friction in horizontal stratified and horizontal slug flow, - models of inter-phase heat and mass transfer in horizontal stratified and horizontal slug flow, - model of transition between both flow regimes in the presence of the inter-phase mass transfer.
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