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Tailoring boundary geometry to optimize heat transport in turbulent convection
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Yale University, United States; University of Oxford, United Kingdom.
2015 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 111, no 4, 44005Article in journal (Refereed) Published
Abstract [en]

By tailoring the geometry of the upper boundary in turbulent Rayleigh-Benard convection we manipulate the boundary layer-interior flow interaction, and examine the heat transport using the lattice Boltzmann method. For fixed amplitude and varying boundary wavelength., we find that the exponent beta in the Nusselt-Rayleigh scaling relation, Nu - 1 proportional to Ra-beta, is maximized at lambda =lambda(max) approximate to ( 2 pi)(-1), but decays to the planar value in both the large (lambda >> lambda(max)) and small (lambda << lambda(max)) wavelength limits. The changes in the exponent originate in the nature of the coupling between the boundary layer and the interior flow. We present a simple scaling argument embodying this coupling, which describes the maximal convective heat flux.

Place, publisher, year, edition, pages
[Toppaladoddi, Srikanth; Wettlaufer, John S.] Yale Univ, New Haven, CT 06520 USA. [Toppaladoddi, Srikanth; Wettlaufer, John S.] Univ Oxford, Math Inst, Oxford, England. [Succi, Sauro] CNR, Ist Applicaz Calcolo Mauro Picone, Rome, Italy. [Wettlaufer, John S.] Royal Inst Technol, NORDITA, Stockholm, Sweden. [Wettlaufer, John S.] Stockholm Univ, S-10691 Stockholm, Sweden., 2015. Vol. 111, no 4, 44005
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-176376DOI: 10.1209/0295-5075/111/44005ISI: 000362357500020ScopusID: 2-s2.0-84941585311OAI: diva2:867857

QC 20151106

Available from: 2015-11-06 Created: 2015-11-03 Last updated: 2015-11-06Bibliographically approved

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