Abstract
A novel convection experiment is conducted in a cell with rough upper and lower
surfaces. The measured heat transport in the rough cell is found to be increased by
more than 76%. Flow visualization and near-wall temperature measurements reveal
new dynamics for the emission of thermal plumes. The experiment shows that the
interaction between the horizontal shear flow due to the large-scale circulation and
the ordered rough surface creates a secondary flow (eddies) in the groove region. The
secondary flow together with the large-scale circulation enhance the detachment of
the thermal boundary layer from the tip of the rough elements. These extra thermal
plumes are responsible for the enhanced heat transport in the rough cell. The discovery
of the enhanced heat transport has important applications in engineering for more
efficient heat transfer.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
119 articles.
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