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Condensation-induced flow structure modifications in turbulent channel flow investigated in direct numerical simulations

Bahavar, Philipp and Wagner, Claus (2020) Condensation-induced flow structure modifications in turbulent channel flow investigated in direct numerical simulations. Physics of Fluids, 32 (015115), pp. 1-12. American Institute of Physics (AIP). DOI: 10.1063/1.5128976 ISSN 1070-6631

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Official URL: https://aip.scitation.org/doi/10.1063/1.5128976

Abstract

Turbulent flow of a fluid carrying trace amounts of a condensable species through a differentially cooled vertical channel geometry is simulated using single-phase direct numerical simulations. The release of latent heat during condensation is modeled by interdependent temperature and vapor concentration source terms governing the relation between the removal of excess vapor from the system and the associated local increase of fluid temperature. A coupling between condensation and turbulence is implemented via solutal and thermal buoyancy. By comparisons to simulations of an identical system without phase transition modeling, the modifications of the subcooled boundary layer due to the transient and highly localized release of latent heat could be observed. Separate analysis of fluid before and after phase transition events shows a clear increase in post-interaction streak spacing, with the release of latent heat during condensation events opposing the cooling effect of the channel wall and the associated damping of turbulence.

Item URL in elib:https://elib.dlr.de/128994/
Document Type:Article
Additional Information:This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids 32, 015115 (2020) and may be found at https://aip.scitation.org/doi/10.1063/1.5128976
Title:Condensation-induced flow structure modifications in turbulent channel flow investigated in direct numerical simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bahavar, PhilippPhilipp.Bahavar (at) dlr.dehttps://orcid.org/0000-0003-3817-7875
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Date:23 January 2020
Journal or Publication Title:Physics of Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:32
DOI :10.1063/1.5128976
Page Range:pp. 1-12
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDAIP PublishingUNSPECIFIED
Publisher:American Institute of Physics (AIP)
ISSN:1070-6631
Status:Published
Keywords:turbulent channel flow, condensation, latent heat, buoyancy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Bahavar, Philipp
Deposited On:19 Feb 2020 14:12
Last Modified:04 Nov 2020 22:07

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