We report a study of liquid jets formed by the collapse of bubbles under cavitation-generated pressure waves. Such jets involve an extensional flow which is characterized by high rates of extension, the latter being relevant to considerations of the flow of oils within dynamically loaded journal bearings. The technique reported here is found to be sensitive to the influence of extremely small concentrations of high molecular weight polymeric additive (xanthan gum). Commercial multigrade oils are also found to exhibit significantly larger resistance to extensional flow than their Newtonian counterparts and, insofar as the multigrade oils studied here are made viscoelastic by polymer additives, and possess significant levels of resistance to extension, the results provide evidence in support of a mitigating effect of viscoelasticity on cavitation, as mooted by Berker et al. [3].
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March 2004
Technical Papers
Rheology of Dilute Polymer Solutions and Engine Lubricants in High Deformation Rate Extensional Flows Produced by Bubble Collapse
M. S. Barrow,
M. S. Barrow
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
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S. W. J. Brown,
S. W. J. Brown
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
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S. Cordy,
S. Cordy
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
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P. R. Williams,
P. R. Williams
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
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R. L. Williams
R. L. Williams
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
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M. S. Barrow
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
S. W. J. Brown
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
S. Cordy
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
P. R. Williams
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
R. L. Williams
Center for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP UK
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division June 3, 2003; revised manuscript received October 30, 2003. Associate Editor: D. Siginer.
J. Fluids Eng. Mar 2004, 126(2): 162-169 (8 pages)
Published Online: May 3, 2004
Article history
Received:
June 3, 2003
Revised:
October 30, 2003
Online:
May 3, 2004
Citation
Barrow , M. S., Brown , S. W. J., Cordy , S., Williams, P. R., and Williams, R. L. (May 3, 2004). "Rheology of Dilute Polymer Solutions and Engine Lubricants in High Deformation Rate Extensional Flows Produced by Bubble Collapse ." ASME. J. Fluids Eng. March 2004; 126(2): 162–169. https://doi.org/10.1115/1.1667889
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