Flow And Heat Transfer Characteristics
Of Tornado-like Vortex Flow
Author(s)
Y. Suzuki & T. Inoue
Abstract
A tornado-like vortex flow has been investigated for both effective local
ventilation from the floor of a room and local heat transfer control without the
circumferential thermal diffusion. A relatively stable axisymmetrical tornadolike
vortex is generated in a water tank by a vertically uniform swirl. The overall
flow structure of the tornado-like vortex has been categorized into three regions:
the outer free vortex region, the inflow layer (the Ekman boundary layer), and
the vortex tube. The present tornado-like vortex flow was investigated
experimentally and also agrees qualitatively with this flow structure. In the free
vortex region, the tangential velocity distribution shows a Rankine-like
vortex and has good agreement with an approximate formula characterized by
the radius and the maximum tangential velocity of the forced vortex. A
numerical analysis using an axisymmetrical laminar flow model is carried out.
To eliminate the effect of swirl supplying methods, a virtual cylindrical surface
of the radius (Rout) is considered, where an axisymmetrical flow is established.
All experimental and computational data of the flow characteristics of the
tangential velocity profile in the free vortex region are well-arranged by the
Reynolds number based on the flow rate and the swirl Reynolds number based
on Rout. The flow structure in the Ekman boundary layer is characterized by the
tangential velocity profile in the free vortex region and the height where the
radial velocity is half its maximum value. The heat transfer characteristics of the
heated plate with uniform heat flux located on the bottom are investigated both
experimentally and computationally. The forced convective heat transfer of the
tornado-like swirling flow is handled in the same way as the laminar forced
convective heat transfer on a flat plate, by using the maximum radial velocity
component in the Ekman boundary layer.
Keywords: tornado-like vortex, swirl flow, flow structure, heat transfer control.
Keywords
tornado-like vortex, swirl flow, flow structure, heat transfer control.
Related Book
Other papers in this volume
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