Conference article

Extended Modelica Model for Heat Transfer of Two-Phase Flows in Pipes Considering Various Flow Patterns

Timm Hoppe
XRG Simulation GmbH, Harburger Schlossstr. 6-12, 21079 Hamburg Germany

Friedrich Gottelt
XRG Simulation GmbH, Harburger Schlossstr. 6-12, 21079 Hamburg Germany

Stefan Wischhusen
XRG Simulation GmbH, Harburger Schlossstr. 6-12, 21079 Hamburg Germany

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Published in: Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017

Linköping Electronic Conference Proceedings 132:53, p. 467-476

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Published: 2017-07-04

ISBN: 978-91-7685-575-1

ISSN: 1650-3686 (print), 1650-3740 (online)


Boiling in vertical and horizontal pipes is a complex process defining transient and static performance of various technical applications. An extensive literature review taking all relevant boiling regimes is presented. The models from the literature are evaluated with respect to accuracy and suitability for system simulation application. A set of sub-models for each of the existing boiling phenomena is implemented and applied to a global boiling model. The work pays special attention to smooth transition between the sub-models and to numerical efficient solutions with respect to the consideration of the boiling crisis.


Boiling model, heat transfer, two phase flow, pipe flow, evaporation, critical heat flux, boiling crisis, subcooled boiling, saturated boiling, flow pattern, Fluid-Dissipation, ClaRa


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