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A semi-empirical model for the prediction of heat and mass transfer of humid air in a vented cavity

Niehaus, Konstantin A. and Westhoff, Andreas and Wagner, Claus (2023) A semi-empirical model for the prediction of heat and mass transfer of humid air in a vented cavity. International Journal of Heat and Mass Transfer, 205 (123926), pp. 1-14. Elsevier. doi: 10.1016/j.ijheatmasstransfer.2023.123926. ISSN 0017-9310.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0017931023000819


A semi-empirical model to predict the mass transfer rate of water from humid air in mixed convection together with the global heat transfer in a novel experimental set-up is presented. The cuboidal sample consists of isothermally cooled and heated plates with ventilation channels driving a mixed convective flow with inlet channel Reynolds numbers between 210 and 1270, Grashof numbers up to 8.46 , and with relative humidities from 29% to 83% (at 25 C). The volumetric velocity field was measured by means of tomographic particle image velocimetry together with the fluid temperature and humidity. The measurement results are used to develop a one-dimensional model to predict the global heat and mass transfer by quantifying the dependency of the Nusselt and Sherwood number on the experimental boundary conditions. A relative deviation between the measurement results and the model prediction below 1% for the sensible heat transfer is reported, while the prediction of the vapor-mass transfer rate exhibits an average relative deviation below 6%.

Item URL in elib:https://elib.dlr.de/193732/
Document Type:Article
Title:A semi-empirical model for the prediction of heat and mass transfer of humid air in a vented cavity
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Niehaus, Konstantin A.UNSPECIFIEDhttps://orcid.org/0000-0001-7083-7998UNSPECIFIED
Westhoff, AndreasUNSPECIFIEDhttps://orcid.org/0009-0008-7242-2970UNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:15 May 2023
Journal or Publication Title:International Journal of Heat and Mass Transfer
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-14
EditorsEmailEditor's ORCID iDORCID Put Code
Keywords:mixed convective airflow; heat transfer; scaling; humid air; non-condensable gas:phase transition; mixed convection
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - FFAE - Fahrzeugkonzepte, Fahrzeugstruktur, Antriebsstrang und Energiemanagement
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Niehaus, Konstantin A
Deposited On:24 Mar 2023 14:05
Last Modified:24 Mar 2023 14:05

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