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Experimental study of heat and mass transfer of moist air in convective, asymmetric cooled, vertical gap flows

DOI: 10.1615/ICHMT.2015.THMT-15.1340
pages 615-618

M. Nickl
German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology Department Fluid Systems, Bunsenstr. 10, D-37073 Gottingen Germany

Andreas Westhoff
German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology, Bunsenstr. 10, D-37073 Gottingen, Germany

B. Steinmacher
German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology Department Fluid Systems, Bunsenstr. 10, D-37073 Gottingen Germany

Claus Wagner
German Aerospace Center (DLR), Institute for Aerodynamics and Flow Technology, Bunsenstrasse 10, 37073 Göttingen, Germany; Ilmenau University of Technology, Institute of Thermodynamics and Fluid Mechanics, Germany


An experimental study of heat and mass transfer in convective flows of humid air has been performed in a vertical, one-sided cooled duct. The analysis of the results focusses on the heat transfer due to phase changes as a function of different wall, system and dew point temperatures. We introduce a set of characteristic numbers, which are deduced from the basic equations for mass, momentum, energy and diffusion to identify possible scaling relations. Experiments are performed within the parameter range of Re ~ 6.1 × 104, 0.025 ≤ Reδ ≤ 0.107, Pr ~ 0.71, Ja ~ 1.7 × 10−2 and Fr ~ 0.116. A linear relation between condensation and convective heat transfer is detected in this parameter range. The experimental results show good agreement with Nusselt's theory of laminar film condensation and Shah's correlation for condensation in vapour ?ows.

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