000014514 001__ 14514
000014514 005__ 20161115100154.0
000014514 04107 $$aeng
000014514 046__ $$k2016-08-21
000014514 100__ $$aChing, Emily, S.C.
000014514 24500 $$aTurbulent Rayleigh-Benard convection with polymers

000014514 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014514 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014514 506__ $$arestricted
000014514 520__ $$2eng$$aWe study the effects of polymers on heat transport in turbulent Rayleigh-B´enard convection using direct numerical simulations. We find that for small Weissenberg number, which is the ratio of the polymer relaxation time to the typical time scale of the flow, heat transport is reduced but for sufficiently large Weissenberg number, heat transport is enhanced. Our generalization of the classical boundary layer theory to flows with polymers has demonstrated that polymer stretching gives rise to a space-dependent effective viscosity. By carrying out the generalized boundary layer analysis using the effective viscosity profile computed from the numerical data, we provide a theoretical explanation of the observed transition of heat reduction to heat enhancement when Weissenberg number is increased.

000014514 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014514 653__ $$a

000014514 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014514 720__ $$aChing, Emily, S.C.
000014514 8560_ $$ffischerc@itam.cas.cz
000014514 8564_ $$s87655$$uhttps://invenio.itam.cas.cz/record/14514/files/TS.FM05-3.02.pdf$$yOriginal version of the author's contribution as presented on CD,  page 732, code TS.FM05-3.02
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000014514 962__ $$r13812
000014514 980__ $$aPAPER