Buoyancy impact on secondary flow and heat transfer in a turbulent liquid metal flow through a vertical square duct

•Simulations of turbulent square duct flow at low Prandtl number.•Computation of large number of statistical quantities.•Substantial influence of buoyancy on secondary flow and heat transfer.•Analysis of interaction of buoyancy and secondary flow by Reynolds stress budgets.•Data constitute reference...

Full description

Saved in:
Bibliographic Details
Published in:International journal of heat and mass transfer 2018-10, Vol.125, p.722-748
Main Authors: Niemann, Martin, Blazquez Navarro, Ricardo Antonio, Saini, Vishal, Fröhlich, Jochen
Format: Article
Language:English
Subjects:
Buoyancy
Computational fluid dynamics
Computer simulation
Convection
Fluid flow
Heat transfer
Large eddy simulation
Pattern analysis
Prandtl number
Reynolds number
Reynolds stress
Richardson number
Secondary flow
Turbulent flow
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Simulations of turbulent square duct flow at low Prandtl number.•Computation of large number of statistical quantities.•Substantial influence of buoyancy on secondary flow and heat transfer.•Analysis of interaction of buoyancy and secondary flow by Reynolds stress budgets.•Data constitute reference for turbulence modeling at low Prandtl number. Direct Numerical and Large-Eddy Simulations of the turbulent flow through a vertical square duct at different Reynolds and Richardson numbers are presented for a fluid with low Prandtl number. Buoyancy substantially affects the flow field, Reynolds stresses and heat transfer. A strong coupling between secondary flow and buoyancy effects is found and a double vortex pattern develops with increasing Richardson number which transports hot fluid from the hot to the cold wall. The alterations in the balance of the individual Reynolds stress components leading to the development of this vortex pattern are highlighted. An analysis of the global scaling of secondary flow strength and other quantities identifies the onset of the mixed convection regime.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2018.04.074