A STUDY OF HEAT TRANSFER DUE TO A DECAYING SWIRLING FLOW IN A CYLINDER WITH CLOSED ENDS
Abstract
Heat transfer due to an axisymmetric swirling flow in a cylinder with closed ends was studied. Argon gas was introduced into an evacuated cylinder to establish an axisymmetric swirling flow. Gas temperatures, local heat fluxes, pressure and velocities were measured for the next 500 msec as the flow field decayed. It was observed that the normalized turbulence intensity field is a weak function of time. The decaying velocity field retains its spatial distribution with the passage of time as do the local heat fluxes at the planar wall. The global Nusselt number correlates with a Reynolds number based on the half radius velocity. The exponent of the Reynolds number in that correlation varies from(' (TURN)).8 for high aspect ratios to ('(TURN)).5 for low aspect ratio cylinders. It is concluded that the flow field is quasi-steady for aspect ratios greater than two where the exponent remains constant at 0.8.
Degree
Ph.D.
Subject Area
Mechanical engineering
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