Comparison of velocity decay, spreading and self-similarity in circular, square and plane jets

L. P. Chua, S. C. Tung, S. C.M. Yu

Research output: Chapter in book / Conference proceedingChapter in an edited book (as author)Academic researchpeer-review


The velocity profiles of a circular jet, a square jet and a plane jet with initially laminar boundary layers were measured from the jet exit to about 45 diameters downstream with a single hot-wire probe. The rates of the maximum velocity decay and spreading of the three jets are compared. Within the range of Reynolds numbers investigated, it is found that the square jet has the highest velocity decay rate and plane jet the highest spreading rate. Although the mean velocity profiles reach self-preservation within 8 diameters, it took a longer distance for the three jets to reach self-preservation of the centerline root mean square velocity.

Original languageEnglish
Title of host publicationProceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
PublisherAmerican Society of Mechanical Engineers
Number of pages1
ISBN (Print)0791819612
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Engineering(all)
  • Environmental Science(all)

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