Comparison and validation of turbulence models in the numerical study of heat exchangers

Juan Gonzalo Ardila Marin, Diego Andrés Hincapié Zuluaga, Julio Alberto Casas Monroy

Abstract


This study aims to validate numerical models for heat exchangers developed with the commercial package ANSYS® comparing the results with data published in the literature. The methodology was based on identification of programs, languages, mathematical and numerical models employed by other researchers. Geometries were developed with SolidEdge® and DesignModeler®, discretization meshes with Meshing® and subsequent configuration of standard k-ɛ and k-ω models with Fluent® and CFX®. For internal flow in concentric smooth straight tube exchangers, we recreated the predicted results with Nusselts varying between 100 and 250 and Reynolds regimes between 12*103 and 38*103 The study of internal flow in curved corrugated tube exhibited a great approach of results predicted with the numerical correlation of Zachar with Nusselt numbers in the range of 15-70 for Dean variations between 1*102 and 11*102 in laminar flow. Finally, Nusselt variations between 60 and 275 with Dean Numbers between 1*103 and 9*103 for laminar, transitional and turbulent fully developed flow regime. The study shows the increase of heat flux associated with the change in heat exchangers geometry. Meanwhile, exhibits how computer numerical models can recreate realistic process conditions and thermo-fluid simulation by appropriately configuring systems.


Keywords


Turbulence; SIMPLE; CFD; Nusselt; ANSYS

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