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Evaluation of three measurement techniques for water-vapor mass transfer in case of droplet condensation

Niehaus, Konstantin A. and Volk, Marie-Christine and Westhoff, Andreas and Wagner, Claus (2023) Evaluation of three measurement techniques for water-vapor mass transfer in case of droplet condensation. In: 8th Thermal and Fluids Engineering Conference, TFEC 2023, pp. 1525-1536. ASTFE Digital Library. TFEC2023, 2023-03-26 - 2023-03-29, College Park, MD, USA. doi: 10.1615/TFEC2023.the.046304.

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Official URL: https://dl.astfe.org/conferences/tfec2023,1a7085627906ce67,78e9a3d95a8b42f4.html

Abstract

Mass transfer in moist air flows with droplet condensation is governed by the mutual interaction of convective and latent heat transfer. To characterize the physical mechanisms of such flows, it is necessary to measure the condensation rate precisely. For this purpose, we applied three sophisticated measurement techniques to determine the mass transfer for droplet condensation on a cooled surface. The experimental set-up consists of a rectangular box with a mixed convective airflow. Droplet condensation occurs on a subcooled panel, which has a polymer surface with a droplet contact-angle of 80.07(28) degrees. Time series of the total water mass on the cooled surface, the mass transfer-rate, and total heat transfer are measured in a Reynolds number range from 300 to 900 and relative humidities between 29% and 83% (at 25°C air temperature). The considered measurement methods are: strain gauges for total water mass, self-calibrated capacitive humidity probes for mass difference between the inlet and outlet of the sample, and microscopy for the surface droplet-distribution. By means of these measurement techniques a total mass-transfer uncertainty lower than 0.01% of the maximum value is obtained with an uncertainty of the mass-transfer rate below 0.01 mg/s (1% of maximum value). At the conference we would like to present the evaluation and comparison of these measurement techniques, lead a discussion on their respective advantages and disadvantages and present results to verify the scaling of latent and convective heat transfer in mixed convective air flows with droplet condensation.

Item URL in elib:https://elib.dlr.de/188619/
Document Type:Conference or Workshop Item (Speech)
Title:Evaluation of three measurement techniques for water-vapor mass transfer in case of droplet condensation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Niehaus, Konstantin A.UNSPECIFIEDhttps://orcid.org/0000-0001-7083-7998UNSPECIFIED
Volk, Marie-ChristineUNSPECIFIEDhttps://orcid.org/0009-0003-8963-2724UNSPECIFIED
Westhoff, AndreasUNSPECIFIEDhttps://orcid.org/0009-0008-7242-2970UNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:March 2023
Journal or Publication Title:8th Thermal and Fluids Engineering Conference, TFEC 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI:10.1615/TFEC2023.the.046304
Page Range:pp. 1525-1536
Publisher:ASTFE Digital Library
Status:Published
Keywords:mixed convection, heat transfer, humid air, droplet condensation, measurement techniques, phase transition
Event Title:TFEC2023
Event Location:College Park, MD, USA
Event Type:international Conference
Event Start Date:26 March 2023
Event End Date:29 March 2023
Organizer:American Society of Thermal and Fluids Engineers
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Energie und Verkehr (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Niehaus, Konstantin A
Deposited On:30 Mar 2023 13:38
Last Modified:24 Apr 2024 20:49

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