When a cylindrical capsule moved by water flowing in a pipe is stopped by the presence of a protrusion or obstacle on the pipe floor, the capsule is likely to tilt in the pipe. This paper predicts the minimum velocity required to cause capsule tilt, based on analysis and experimental data. Capsules of three different aspect ratios and three diameter ratios were tested in a small pipe loop. The experimental values of the capsule drag coefficient compared well with those from theory and a previous study. Data were used to compute the lift moment coefficient and the critical tilt Froude number required for estimating capsule tilt. Three large capsules with six different specific gravities were tested in a large pipe. Small and large capsule data showed good correlation between lift moment coefficient and tilt Froude number. The authors reveal that in some cases the capsule incipient velocity is governed by the critical tilt velocity.


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  • Accession Number: 00716559
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 29 1996 12:00AM