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Title of Journal: Rheol Acta

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Abbravation: Rheologica Acta

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Springer-Verlag

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DOI

10.1016/0039-6028(89)90428-7

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1435-1528

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Generation of inkjet droplet of nonNewtonian flui

Authors: Hansol Yoo Chongyoup Kim
Publish Date: 2013/02/17
Volume: 52, Issue: 4, Pages: 313-325
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Abstract

In this study the generation of inkjet droplets of xanthan gum solutions in water–glycerin mixtures was investigated experimentally to understand the jetting and drop generation mechanisms of rheologically complex fluids using a dropondemand inkjet system based on a piezoelectric nozzle head The ejected volume and velocity of droplet were measured while varying the wave form of bipolar shape to the piezoelectric inkjet head and the effects of the rheological properties were examined The shear properties of xanthan gum solutions were characterized for wide ranges of shear rate and frequency by using the diffusive wave spectroscopy microrheological method as well as the conventional rotational rheometry The extensional properties were measured with the capillary breakup method The result shows that drop generation process consists of two independent processes of ejection and detachment The ejection process is found to be controlled primarily by high or infinite shear viscosity Elasticity can affect the flow through the converging section of inkjet nozzle even though the effect may not be strong The detachment process is controlled by extensional viscosity Due to the strain hardening of polymers the extensional viscosity becomes orders of magnitude larger than the Trouton viscosities based on the zero and infinite shear viscosities The large extensional stress retards the extension of ligament and hence the stress lowers the flight speed of the ligament head The viscoelastic properties at the highfrequency regime do not appear to be directly related to the drop generation process even though it can affect the extensional properties


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  7. The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions
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  9. Molecular architecture and linear viscoelasticity of homogeneous ethylene/styrene copolymers
  10. Flow analysis of the weld line formation during injection mold filling of thermoplastics
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  12. Molecular orientation in non-Newtonian flow of dilute polymer solutions around spheres
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  14. End effects in rotational viscometry II. Pseudoplastic fluids at elevated Reynolds number
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  18. Orientation distribution in injection molding: a further step toward more accurate simulations
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