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All figures (17)
Fig. 4: Fabrication of SU-8 microchannels using photolithography and sealing of the microchannel with a Bungard dry film laminator. (a) Deposition of SU-8 on PZT subtrate and mask used to pattern the SU-8 channel during photolithography. (b) SU-8 channel after wet etching of a patterned surface. (c) Laminted MHE with Bunduard film laminator.
Fig. 3: Schematic of the de-pinning process in a closed rectangular microchannel, where the change in width of the film is ∆w. The depinning process proceeds in both directions. The contact angle θc is the measured angle made by the pinned film with the surface of the channel.
Fig. 1: Schematic of problem configuration in the MHE
Fig. 2: Schematic of the evaporation process in a closed rectangular microchannel. The change in droplet width for either end of the channel is ∆w. The model represents half of the channel width. The contact angle θc is the angle made by the bulk fluid with the surface of the channel.
Fig. 11: Bulk and pinned film contact angle measurement using UTHSCSA image tool.
Fig. 12: Effects of contact angle and width on evaporation of the bulk fluid
Fig. 10: Comparison of experimental and analytical results of evaporation of toluene in a rectangular microchannel of different depths.
Fig. 9: Comparison of experimental and analytical results of evaporation of DI-water in a rectangular microchannel of different depths
Fig. 14: Initial de-pinning of DI-water droplet after evaporation of bulk fluid at time t=0s. (b) End of simultaneous de-pinning across the length and width of the film with maximum spreading of the bulk fluid at time t=1.16s. (c) Significant increase in de-pinning rate at time t = 2.96s. (d) End of de-pinning at time t = 4.42s (Magnification is ×5).
Fig. 13: Initial de-pinning of toluene droplet after evaporation of bulk fluid at time t=0s. (b) Increase in de-pinning rate across the length and width of the droplet simultaneously at time t=1.33s. (c) Decrease in de-pinning rate across the length of the droplet at time t = 2.67s. (d) End of de-pinning at time t = 5.56s (Magnification is ×10).
Fig. 16: Comparison of experimental and analytical results of de-pinning of toluene
Fig. 15: Comparison of experimental measurements and analytical predictions of de-pinning
Fig. 8: Comparison of experimental and analytical results of evaporation in the microchannel
Fig. 7: (a) Initial wetting of toluene on a substrate at time t=0s. (b) Beginning of separation of a bulk fluid and pinned film at time t=0.76s. (c) Reduction in the evaporation rate at time t = 2.76s. (d) End of the evaporation of a bulk fluid at time t=3.76 (Magnification is × 10).
Fig. 17: Effect of microchannel width on de-pinning of the bulk fluid
Fig. 5: Fabricated SU-8 2075 80µm microchannel viewed at 5× magnification of a Reichert Austria stereo microscope.
Fig. 6: (a) Initial separation of a DI-water droplet and pinned film at time t=0s. (b) Maximum spreading of the bulk fluid at time t=0.92s. (c) Reduction in evaporation rate at time t = 3.32s. (d) End of the evaporation of the bulk fluid at time t = 6.08s (Magnification is ×5).
Journal Article
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DOI
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Droplet evaporation and de-pinning in rectangular microchannels
[...]
A. Odukoya
1
,
Greg F. Naterer
1
•
Institutions (1)
University of Ontario Institute of Technology
1
01 Jan 2013
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International Journal of Heat and Mass Transfer