000014506 001__ 14506
000014506 005__ 20161115100153.0
000014506 04107 $$aeng
000014506 046__ $$k2016-08-21
000014506 100__ $$aXia, Ke-Qing
000014506 24500 $$aTurbulent thermal convection over rough surfaces with varying roughness size

000014506 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014506 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014506 506__ $$arestricted
000014506 520__ $$2eng$$aWe present experimental study of turbulent thermal convection over rough surfaces with varying roughness size. It is found that the local temperature fluctuations measured at the cell center and near the sidewall change significantly with the increase of the roughness parameter λ, which is defined as the ratio of the height of the pyramid-shaped roughness element over the width of its base. The change of the local temperature fluctuations occur concomitantly with the change of the global heat transport law of the system, i.e. the Rayleigh number Ra dependence of the non-dimensional heat flux Nusselt number N u. Detailed examinations of the local temperature time series indicate that the changes are brought into by the changes of plume dynamics which is supported by the observation that the dissipative power Q increases with the increase of λ.

000014506 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014506 653__ $$a

000014506 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014506 720__ $$aXia, Ke-Qing
000014506 8560_ $$ffischerc@itam.cas.cz
000014506 8564_ $$s85875$$uhttps://invenio.itam.cas.cz/record/14506/files/TS.FM05-1.05.pdf$$yOriginal version of the author's contribution as presented on CD,  page 717, code TS.FM05-1.05
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000014506 962__ $$r13812
000014506 980__ $$aPAPER