The velocity profiles of an axisymmetric circular jet with initially laminar boundary layer condition were measured extensively from the jet exit to about 45 diameters (d) downstream with a single hot wire probe to verify a new quantification method for valvular regurgitation and its lesion size. The flow visualization using smoke-wire at the near field of the jet indicates that the interaction of the mixing layer is rather smooth and gentle. As a result, the self-preservation of the centerline local mean velocity (Uo) and half radius (Ru) were established at a rather short distance from the jet exit. The onset of self-preservation of Uo is found to be about 6d with initial laminar velocity condition and this distance may be used as a guide-line to predict the orifice of lesion (presumably circular in shape). Velocity measurements for valvular regurgitation jets for that for that matter, should be taken at a minimum distance of 6d.
|Number of pages||12|
|Journal||Journal of Mechanical Engineering Research and Developments|
|Publication status||Published - 1 Dec 1997|
ASJC Scopus subject areas
- Mechanical Engineering