Article (Scientific journals)
Heat transfer enhancement and reduction in low-Rayleigh number natural convection flow with polymer additives
Dubief, Yves; Terrapon, Vincent
2020In Physics of Fluids, 32 (3), p. 033103
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Keywords :
Natural convection; Polymer; Viscoelastic; Direct numerical simulation DNS; FENE-P; Heat transfer
Abstract :
[en] The effects of viscoelasticity, here caused by polymer additives, on Rayleigh Bénard convection flows are investigated via direct numerical simulations at a marginally turbulent Rayleigh number. Simulations with a range of polymer length and relaxation time scales show heat transfer enhancement (HTE) and reduction (HTR). The selection of HTE and HTR depends strongly on the maximum extensional viscosity of the solution, whereas the magnitude of heat transfer modification is a function of both the maximum extensional viscosity and relaxation time of the polymer solution. The underlying physics of HTE and HTR are explored, and a mechanism of the interaction between convection cells and polymers is proposed. The findings are extrapolated to high Ra to shed some new light onto experimental observations of HTR.
Research center :
A&M - Aérospatiale et Mécanique - ULiège
Disciplines :
Mechanical engineering
Author, co-author :
Dubief, Yves;  University of Vermont
Terrapon, Vincent  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents
Language :
English
Title :
Heat transfer enhancement and reduction in low-Rayleigh number natural convection flow with polymer additives
Publication date :
25 March 2020
Journal title :
Physics of Fluids
ISSN :
1070-6631
eISSN :
1089-7666
Publisher :
American Institute of Physics, United States - New York
Volume :
32
Issue :
3
Pages :
033103
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 April 2020

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