The objective of this study is to develop a computational model that accurately describes the dynamic behavior of a non-Newtonian power-law film formed after a drop impinges on a flat surface. The non-Newtonian drop deposition and spreading process is described by a model based on one developed for Newtonian liquids. The effects of variations in non-Newtonian liquid rheological parameters, such as (the non-Newtonian Reynolds number), (the flow behavior index), and We (the Weber number), are studied in detail. Results show that a reduction in the viscous forces results in enhanced spreading of the film followed by a more rapid recession. An increase in surface tension results in reduced spreading of the film, followed by a more rapid recession. Model predictions of film diameter as a function of time were larger than corresponding experimental values obtained as part of this study. However, the discrepancy never exceeded 21%, demonstrating that the model accurately predicts the phenomena of interest. This comparison also shows that the results are in best agreement for large non-Newtonian Reynolds numbers and small non-Newtonian Ohnesorge numbers .
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October 2010
Research Papers
Non-Newtonian Drops Spreading on a Flat Surface
A. Dechelette,
A. Dechelette
Maurice J. Zucrow Laboratories, School of Mechanical Engineering,
Purdue University
, West Lafayette, IN 47907-2014
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P. E. Sojka,
P. E. Sojka
Maurice J. Zucrow Laboratories, School of Mechanical Engineering,
e-mail: sojka@ecn.purdue.edu
Purdue University
, West Lafayette, IN 47907-2014
Search for other works by this author on:
C. R. Wassgren
C. R. Wassgren
Maurice J. Zucrow Laboratories, School of Mechanical Engineering,
Purdue University
, West Lafayette, IN 47907-2014
Search for other works by this author on:
A. Dechelette
Maurice J. Zucrow Laboratories, School of Mechanical Engineering,
Purdue University
, West Lafayette, IN 47907-2014
P. E. Sojka
Maurice J. Zucrow Laboratories, School of Mechanical Engineering,
Purdue University
, West Lafayette, IN 47907-2014e-mail: sojka@ecn.purdue.edu
C. R. Wassgren
Maurice J. Zucrow Laboratories, School of Mechanical Engineering,
Purdue University
, West Lafayette, IN 47907-2014J. Fluids Eng. Oct 2010, 132(10): 101302 (7 pages)
Published Online: October 20, 2010
Article history
Received:
May 31, 2007
Revised:
July 12, 2010
Online:
October 20, 2010
Published:
October 20, 2010
Citation
Dechelette, A., Sojka, P. E., and Wassgren, C. R. (October 20, 2010). "Non-Newtonian Drops Spreading on a Flat Surface." ASME. J. Fluids Eng. October 2010; 132(10): 101302. https://doi.org/10.1115/1.4002281
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