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Experimental study of heat and mass transfer in convective flows of moist air with droplet condensation as a function of surface roughness and wetting properties

Westhoff, Andreas (2018) Experimental study of heat and mass transfer in convective flows of moist air with droplet condensation as a function of surface roughness and wetting properties. In: Proceedings of the 5th International Conference on Experimental Fluid Mechanics, pp. 692-697. Universität der Bundeswehr München: Athene-Forschung. 5th International Conference on Experimental Fluid Mechanics, 02.07.2018 - 04.07.2018, München, Germany. DOI: 10.18726/2018_2 ISBN 978-3-943207-32-3

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Official URL: https://athene-forschung.unibw.de/123970?query=Westhoff&show_id=124179

Abstract

Experiments are carried out in order to study the heat transfer in a forced convective air flow with phase transition on glass panes. The measurements are performed in a vertically oriented gap wind tunnel with a rectangular cross section. In addition, one side of the gap is isothermally cooled and a glass pane with a defined surface is mounted on the cooled wall. In the present paper the results of the heat and mass transfer are discussed as a function of the surface roughness and wetting properties for four different surfaces at a Reynolds number of Re = 2300. The heat transmission from the fluid through the glass pane and the corresponding mass transfer is examined in detail for one surface. The result reveals an impact of the droplet radius, vapour density and temperature on the heat transmission coefficient. Further, a linear relation between Sherwood Sh and Nusselt Nu for the present parameter variation is found. In addition, a nondimensional parametrisation and an analysing method are introduced in order to characterise and determine the heat and mass transfer for the present configuration.

Item URL in elib:https://elib.dlr.de/120354/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental study of heat and mass transfer in convective flows of moist air with droplet condensation as a function of surface roughness and wetting properties
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Westhoff, AndreasAndreas.Westhoff (at) dlr.deUNSPECIFIED
Date:June 2018
Journal or Publication Title:Proceedings of the 5th International Conference on Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.18726/2018_2
Page Range:pp. 692-697
Editors:
EditorsEmail
Kähler, ChristianUNSPECIFIED
Rainer, HainUNSPECIFIED
Scharnowski, SvenUNSPECIFIED
Fuchs, ThomasUNSPECIFIED
Publisher:Universität der Bundeswehr München: Athene-Forschung
Series Name:Proceedings of the 5th International Conference on Experimental Fluid Mechanics
ISBN:978-3-943207-32-3
Status:Published
Keywords:heat and mass transfer, moist air flow, forced convection, phase transition, droplet condensation, wetting properties
Event Title:5th International Conference on Experimental Fluid Mechanics
Event Location:München, Germany
Event Type:international Conference
Event Dates:02.07.2018 - 04.07.2018
Organizer:Universität der Bundeswehr München
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - NGC-Energiemanagement (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Westhoff, Andreas
Deposited On:07 Jan 2019 02:59
Last Modified:31 Jul 2019 20:18

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