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Electrospinning of viscoelastic Boger fluids: Modeling and experiments
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Image of FIG. 1.
FIG. 1.

Rheological characterization of PIB solutions. Top: Shear viscosity measurement for Boger fluid: the shear viscosity of the fluid is seen to effectively remain constant over a wide shear rate range. Bottom: Relaxation time determination for two different PIB Boger fluids, one with , and the other with .

Image of FIG. 2.
FIG. 2.

Electrospinning setup.

Image of FIG. 3.
FIG. 3.

Experimental images of glycerol jets using an increasing applied potential difference. Left to right: [kV]: 9.5, 10, 10.5, 11, 11.5.

Image of FIG. 4.
FIG. 4.

A comparison between experimental and simulated profiles for a glycerol jet. Lines are the simulated profiles and circles represent the experimental profiles.

Image of FIG. 5.
FIG. 5.

Glycerol, (left) and LiCl, (right) under exactly the same spinning conditions, , .

Image of FIG. 6.
FIG. 6.

Top: predicted influence of conductivity increase on the jet radius profile; bottom: contributions to jet current.

Image of FIG. 7.
FIG. 7.

Electric field intensity and surface charge profiles for glycerol and salt jets.

Image of FIG. 8.
FIG. 8.

A comparison of experimental and simulated radius profiles for the glycerol-salt solution.

Image of FIG. 9.
FIG. 9.

Influence of the Deborah number on the jet profile.

Image of FIG. 10.
FIG. 10.

Top: dimensionless thinning force per unit length along the jet; Bottom: Extensional viscosity profile along the jet at various Deborah numbers.

Image of FIG. 11.
FIG. 11.

Top: dimensionless axial stretching force profile along jet; bottom: ratio of stretching force to extensional viscosity.

Image of FIG. 12.
FIG. 12.

Influence of fluid properties. Top: electrical conductivity; bottom: viscosity.

Image of FIG. 13.
FIG. 13.

Top: influence of surface tension; bottom: influence of fluid flow rate.

Image of FIG. 14.
FIG. 14.

Influence of finite extensibility on jet profile.

Image of FIG. 15.
FIG. 15.

Images of jets of increasing viscoelasticity. Left to right: glycerol, ; PIB, ; PIB, ; PIB , .

Image of FIG. 16.
FIG. 16.

Top: experimental radius profiles extracted from the images in Fig. 14; bottom: experimental radius profiles observed from the spinning of PIB at different flow rates.

Image of FIG. 17.
FIG. 17.

A comparison of simulated and experimental jet radius profiles; top left: PIB, and , top right: PIB, and , bottom left: PIB; and , bottom right: PIB ; and .

Image of FIG. 18.
FIG. 18.

Qualitative behavior of PEO-water jets: experiment and simulation. The simulation parameters are ; ; ; ; ; ; ; ; and . The experimental image is of a PEO-water solution using applied over a gap of .


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Table I.

Measured property values for glycerol and Boger fluids.

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Table II.

Dimensionless electrostatic force parameter and electric field strength for glycerol.

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Table III.

Parameter values for electrospinning of glycerol-LiCl

Generic image for table
Table IV.

Dimensionless groups corresponding to the conditions of spinning experiments.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electrospinning of viscoelastic Boger fluids: Modeling and experiments