The Society of Rheology: 69th Annual Meeting (Oct 1997) Abstract of Paper

Viscoelastic jets of Boger fluid discharging from a vertical, circular, long capillary are studied photographically. Detailed structure of the interface has been analyzed using digital image analysis. The instantaneous free surface has been reconstructed allowing quantitative study of the evolution and dynamics of the free surface.

The profiles of the jet vary strongly with flow rate (Deborah number, De). At small values of De, necking of the jet similar to that Newtonian jets is observed, while at larger Deborah numbers the jet exhibits die-swell. Near the exit, the radius of the jet increases monotonically with Deborah number.

At low flow rates, the surface of the jet is smooth, while the free surface is distorted as a result of instabilities at higher values of De. The instabilities manifest themselves into a uniformly spaced structure around the free surface of the jet. These are observed as vertical stripes laid along the jet. The critical value of De for the onset of the instability is measured, and the spatial structure of the surface distortion is determined quantitatively from gray scale information of images. The number of stripes is measured to be about 30 around the free surface near the exit, and is a weak function of De. At very high Deborah numbers, the flow becomes time dependent near the capillary exit, and the number of stripes at a given axial location varies with time.

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Session	Rheology and Flow-Induced Structure of Blends and Solutions
Date	Wednesday, October 22, 1997
Time	1:30
Room	Legislative

Title	VISCOELASTIC JETS OF POLYMER SOLUTION DISCHARGING FROM A CAPILLARY
Authors	R. Y-C. Liang, A. Oztekin, and S. Neti
Address	Lehigh University, Bethlehem, PA 18015-3085

Name	E-mail
Liang, R. Y-C.	No Entry
Oztekin, Alparslan	No Entry
Neti, S	No Entry

69th Annual Meeting (Oct 1997)

Abstract of Paper BS14

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