An experimental study of instabilities and other flow properties of a laminar pipe jet
Article first published online: 17 JUN 2004
Copyright © 1972 American Institute of Chemical Engineers
Volume 18, Issue 4, pages 689–698, July 1972
How to Cite
Iribarne, A., Frantisak, F., Hummel, R. L. and Smith, J. W. (1972), An experimental study of instabilities and other flow properties of a laminar pipe jet. AIChE J., 18: 689–698. doi: 10.1002/aic.690180405
- Issue published online: 17 JUN 2004
- Article first published online: 17 JUN 2004
- Manuscript Accepted: 11 FEB 1972
- Manuscript Revised: 4 FEB 1972
- Manuscript Received: 26 OCT 1971
Flow patterns in an axisymmetrical laminar pipe jet with a flat entering velocity profile and a diametrical expansion ratio of 1:2 was investigated using nondisturbing flow visualization. A wavelike instability was discovered in the detached shear layer even at the lowest Reynolds numbers, and for Reynolds numbers greater than 350 tangential motions were observed, resulting in considerable turbulence near the mean position of re-attachment. This turbulence even at low Reynolds explains local high rates of mass and heat transfer. The mean re-attachment position depends on Reynolds number.
Instantaneous mean velocity profiles and wall shear stresses were determined.