Thermo-Fluidics of Solid Ink-Solid Surface Interaction

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Thermo-Fluidics of Solid Ink-Solid Surface
Interaction

• Sunny Ri Li and Nasser Ashgriz
• Department of Mechanical and Industrial
  Engineering
• University of Toronto

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Experimental setup
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Experimental setup
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Major Components
High-speed Video Camera
Substrate with heater mounted on a
linear-movement and tilt and rotation stage
LabView, PXI board and SCXI Signal Conditioner
Lighting Sources
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Setup for impaction
The substrate surface is 5 mm away from the print
head..
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Droplet Impaction on 23 oC Substrate
Height 28.5 microns Width 51.6microns (1
droplet) Droplet speed 0.651 m/s Contact
angle 70 deg.
Height 46.8 microns Width 101.1 microns (10
droplets) Droplet speed 0.651 m/s Contact
angle 70 deg.
Diameter 178 microns (50 droplets) Droplet
speed 1.59m/s
Diameter 269 microns (100 droplets) Droplet
speed 1.59m/s
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Arrest of advancing contact line
Time t (1 droplet)
Time t15/4000 sec. (6 droplets)
Time t3/4000 sec. (2 droplets)
Time t29/4000 sec. (10 droplets)
Time t6/4000 sec. (3 droplets)
Time t117/4000 sec. (40 droplets)
Time t15/4000 sec. (6 droplets)
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Droplet Impaction on Heated Substrate
Time t
Time t1/8000 sec.
Time t2/8000 sec.
Temperature of the substrate 78 oC 1 droplet
Contact angle 48 deg.
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Impaction of large wax drop
Wax drop impacting on an aluminum surface
Drop diameter 2.89mm Velocity 0.92m/s
We70.4 Temperature of substrate 40 oC
Temperature of drop 85 oC
Wax drop impacting on another solidified drop
Drop diameter 1.98mm Velocity 0.5m/s We14.3
Temperature of substrate 40 oC Temperature of
drop 85 oC
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Setup for Visualizing Ink Ejection