Crossover of the relative heat transport contributions of plume ejecting and impacting zones in turbulent Rayleigh-Bénard convection

Philipp Reiter*, Olga Shishkina, Detlef Lohse, Dominik Krug

*Corresponding author for this work

Research output: Contribution to journalLetterAcademicpeer-review

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Abstract

Turbulent thermal convection is characterized by the formation of large-scale structures and strong spatial inhomogeneity. This work addresses the relative heat transport contributions of the large-scale plume ejecting vs. plume impacting zones in turbulent Rayleigh-Bénard convection. Based on direct numerical simulations of the two dimensional (2-D) problem, we show the existence of a crossover in the wall heat transport from initially impacting dominated to ultimately ejecting dominated at Ra ≈ 3 × 1011. This is consistent with the trends observed in 3-D convection at lower Ra, and we therefore expect a similar crossover to also occur there. We identify the development of a turbulent mixing zone, connected to thermal plume emission, as the primary mechanism for the takeover. The mixing zone gradually extends vertically and horizontally, therefore becoming more and more dominant for the overall heat transfer.

Original languageEnglish
Article number34002
JournalEurophysics letters
Volume134
Issue number3
DOIs
Publication statusPublished - 16 Jul 2021

Keywords

  • UT-Hybrid-D

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