The objective of this investigation was to obtain a de¬tailed description of the flow field within a vortex sink rate sensor and to observe the influence of viscous effects on its performance.nThe sensor basically consists of a vortex chamber and a sink tube. The vortex chamber consists of two circular co¬axial disks held apart, at their periphery, by a porous coupling. One circular disk has an opening to permit the mounting of the sink tube, in such a manner that the vortex chamber as well as the sink tube have a common axis of rotation.nA1r was supplied radially to the sensor through its porous coupling as the sensor was rotated at various speeds. Particular emphasis was directed toward an understanding of the flow field in the sink tube region. Thus velocity measure¬ments at various stations along the length of the sink tube as well as along a given radius at any designated station were taken.
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