FLOW DISTRIBUTIONS IN A CONFINED VISCOUS VORTEX.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB
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The flow distribution in a viscous vortex, contained in a short cylindrical chamber and driven by injection of fluid through the peripheral wall of the chamber, was investigated experimentally. The radial and axial distributions of the radial and tangential velocities were measured, using a two-dimensional yaw probe to measure flow direction and a pitot probe to measure the velocity head at a point in the flow field. The radial distribution of the static pressure was measured with static pressure taps in the upper end wall of the vortex chamber. It was found that the body of flow away from the end walls behaves approximately like an inviscid fluid in vortex flow, where the static pressure gradient is balanced by the centrifugal force on an element of fluid and where angular momentum is conserved. The axial distribution of radial velocity showed that the boundary layer carried a considerably larger mass flow per unit length of chamber than did the region away from the wall. The reduced centrifugal force on the fluid in the boundary layer, caused by friction at the wall, allowed a large net radial inflow of fluid to the center of the vortex.
- Fluid Mechanics