Thermal Waves and Heat Transfer Efficiency Enhancement in Harmonically Modulated Turbulent Thermal Convection

Autor:	P. Urban, P. Hanzelka, T. Králik, V. Musilová, L. Skrbek
Rok vydání:	2022
Předmět:	Physics::Fluid Dynamics Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences General Physics and Astronomy Physics - Fluid Dynamics
Zdroj:	Physical Review Letters. 128
ISSN:	1079-7114 0031-9007
Popis:	We study turbulent Rayleigh-Bénard convection over four decades of Rayleigh numbers 4×10^{8}Ra2×10^{12}, while harmonically modulating the temperatures of the plates of our cylindrical cell. We probe the flow by temperature sensors placed in the cell interior and embedded in the highly conducting copper plates and detect thermal waves propagating at modulation frequency in the bulk of the convective flow. We confirm the recent numerical prediction [Yang et al., Phys. Rev. Lett. 125, 154502 (2020)PRLTAO0031-900710.1103/PhysRevLett.125.154502] of the significant enhancement of the Nusselt number and report its dependence on the frequency and amplitude of the temperature modulation of plates.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28b787f069555a10d2d7dd757c5164df https://doi.org/10.1103/physrevlett.128.134502 Zobrazit plný text záznamu