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Direct Numerical Simulation of Modified Heat Transfer in Turbulent Channel Flow With Condensation

Bahavar, Philipp und Wagner, Claus (2018) Direct Numerical Simulation of Modified Heat Transfer in Turbulent Channel Flow With Condensation. 10th International Conference on Boiling and Condensation Heat Transfer, 2018-03-12 - 2018-03-15, Nagasaki, Japan.

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Offizielle URL: http://www.icbcht2018.org/

Kurzfassung

Flows with condensing components occur in a wide variety of critical technical applications. Developing more accurate models for predicting the heat and mass transfer in such flows is predicated upon a solid understanding of the phenomena found in the interaction between phase transition and turbulence. In this work, Direct Numerical Simulation (DNS) is employed to investigate the effect of condensing vapor on turbulent channel flow with a cooled wall, in parallel to ongoing experimental efforts focused on a similar system. Temperature and vapor pressure are added to the governing equations as active scalars, and condensation is triggered based on a localized oversaturation condition. Both buoyancy due to temperature and concentration differences as well as heat injection due to the release of latent heat at the phase boundary are considered. By investigating a simple geometry using highly resolved simulations, the effects of the phase transition can be isolated and observed across all scales, from the microscopic interaction with turbulent flow structures to the changes to boundary layer growth up to the impact on the overall heat transfer. In this investigation, we observe an increase in heat transfer compared to a similar flow without modeled condensation and in line with results from experiments. Additionally, we show that condensation events close to the channel wall are directly affected by the structures of the turbulent flow.

elib-URL des Eintrags:https://elib.dlr.de/119033/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Direct Numerical Simulation of Modified Heat Transfer in Turbulent Channel Flow With Condensation
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Bahavar, PhilippNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wagner, ClausClaus.Wagner (at) dlr.dehttps://orcid.org/0000-0003-2273-0568NICHT SPEZIFIZIERT
Datum:2018
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:DNS, Turbulent Channel Flow, Condensation, Heat Transfer
Veranstaltungstitel:10th International Conference on Boiling and Condensation Heat Transfer
Veranstaltungsort:Nagasaki, Japan
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:12 März 2018
Veranstaltungsende:15 März 2018
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - Next Generation Train III (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Fluidsysteme, GO
Hinterlegt von: Bachmann, Barbara
Hinterlegt am:13 Apr 2018 13:14
Letzte Änderung:24 Apr 2024 20:23

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