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Heated vertical duct flow of liquid metal with and without expansion
Author(s) -
Niemann Martin,
Saini Vishal,
Fröhlich Jochen
Publication year - 2017
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201710034
Subject(s) - buoyancy , mechanics , turbulence , forced convection , duct (anatomy) , combined forced and natural convection , convection , secondary flow , heat transfer , richardson number , flow (mathematics) , geology , materials science , natural convection , physics , medicine , pathology
The effects of buoyancy on vertical duct flows with one heated side wall are investigated by means of Direct Numerical Simulations. In particular, the flow through square ducts and behind the expansion of a backward‐facing step with side walls are presented for the forced and mixed convection regime. These configurations allow studying the interaction of buoyancy forces with secondary flow of second kind in the square duct and with the shear layer and recirculation zone in case of the expansion. In both configurations, buoyancy substantially alters the mean flow field, the turbulent stresses, and the heat transfer compared to the corresponding forced convection cases. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)