Reference : Heat transfer enhancement and reduction in low-Rayleigh number natural convection flo...
Scientific journals : Article
Engineering, computing & technology : Mechanical engineering
http://hdl.handle.net/2268/246574
Heat transfer enhancement and reduction in low-Rayleigh number natural convection flow with polymer additives
English
Dubief, Yves [University of Vermont > >]
Terrapon, Vincent mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents >]
25-Mar-2020
Physics of Fluids
American Institute of Physics
32
3
033103
Yes (verified by ORBi)
International
1070-6631
1089-7666
NY
[en] Natural convection ; Polymer ; Viscoelastic ; Direct numerical simulation DNS ; FENE-P ; Heat transfer
[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.
Aérospatiale et Mécanique - A&M
Researchers
http://hdl.handle.net/2268/246574
10.1063/1.5143275
https://aip.scitation.org/doi/10.1063/1.5143275

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