Measurement of a round jet: Prediction of valvular regurgitation and its lesion size

L.P. Chua, Ching Man Yu, S.H. Winoto, D.A. Shah

Research output: Journal article publicationJournal articleAcademic researchpeer-review


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.
Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalJournal of Mechanical Engineering Research and Developments
Publication statusPublished - 1 Dec 1997
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering


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