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Confined inclined thermal convection in low-Prandtl-number fluids
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Confined inclined thermal convection in low-Prandtl-number fluids
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Journal Article
Confined inclined thermal convection in low-Prandtl-number fluids
2018
Overview
Any tilt of a Rayleigh–Bénard convection cell against gravity changes the global flow structure inside the cell, which leads to a change of the heat and momentum transport. Especially sensitive to the inclination angle is the heat transport in low-Prandtl-number fluids and confined geometries. The purpose of the present work is to investigate the global flow structure and its influence on the global heat transport in inclined convection in a cylindrical container of diameter-to-height aspect ratio
$\\unicode[STIX]{x1D6E4}=1/5$
. The study is based on direct numerical simulations where two different Prandtl numbers
$Pr=0.1$
and 1.0 are considered, while the Rayleigh number,
$Ra$
, ranges from
$10^{6}$
to
$10^{9}$
. For each combination of
$Ra$
and
$Pr$
, the inclination angle is varied between 0 and
$\\unicode[STIX]{x03C0}/2$
. An optimal inclination angle of the convection cell, which provides the maximal global heat transport, is determined. For inclined convection we observe the formation of two system-sized plume columns, a hot and a cold one, that impinge on the opposite boundary layers. These are related to a strong increase in the heat transport.
Publisher
Cambridge University Press
Subject
