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Some Cavitation Experiments with Dilute Polymer Solutions

Brennen, Christopher (1968) Some Cavitation Experiments with Dilute Polymer Solutions. 123. National Physical Laboratory .

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A previous paper (Brennen (1968b)) reported the observation and analysis of wave patterns on the surface of fully developed cavities behind a series of axisymmetric headforms in No.2 water tunnel at Ship Division, NPL. Comparison of theory and experiment appeared to confirm that these waves, which appeared a short distance after separation, grew in amplitude as they were convected downstream and then under certain conditions broke up into turbulence, were the amplified result of a select frequency instability in the separated or cavity surface boundary layer. The small vertical tunnel (figure 1) was employed to study and extend observation of the same phenomenon to smaller headforms and Reynolds numbers. An additional intention was to investigate the effect of small quantities of polymer additive on the behaviour of this instability. But, a more dramatic phenomenon was manifest with the addition of these drag-reducing chemicals, leaving the original objective unattainable.

Item Type:Report or Paper (Technical Report)
Additional Information:National Physical Laboratory. Ship Division. Ship Report Report 123. This work is part of the research programme of the Ship Division of the National Physical Laboratory. The author is deeply indebted to Mr. David Swindells, who took responsibility for the photography and produced such excellent results. I also wish to thank Dr. G. E. Gadd for valuable discussions on the subject matter.
Issue or Number:123
Record Number:CaltechAUTHORS:BREnpl68b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43
Deposited By: Christopher Brennen
Deposited On:15 Dec 2004
Last Modified:02 Oct 2019 22:16

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