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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Stability and Oscillations in an Evaporating Corner Meniscus

[+] Author and Article Information
L. Zheng, J. L. Plawsky, P. C. Wayner

The Isermann Department of Chemical Engineering, Rensselaer Polytechnic Institute, Troy, NY-12180

S. DasGupta

Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, PIN-721302, India

J. Heat Transfer 126(2), 169-178 (May 04, 2004) (10 pages) doi:10.1115/1.1652046 History: Received April 03, 2003; Revised December 02, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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References

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Derjaguin, B. V., 1989, Theory of Stability of Thin Films and Colloids, Consultant Bureau/Plenum, New York.
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Morris,  S. J. S., 2001, “Contact Angles for Evaporating Liquids Predicted and Compared with Existing Experiments,” J. Fluid Mech., 432, pp. 1–30.
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Sharma,  A., 1998, “Equilibrium and Dynamics of Evaporating or Condensing Thin fluid Domains: Thin film Stability and Heterogeneous Nucleation,” Langmuir, 14, pp. 4915–4928.
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Figures

Grahic Jump Location
Experimental setup of the CVBLT (not to scale). The region viewed by the microscope has a square cross-section.
Grahic Jump Location
(a) Interference pattern of the stationary film at x=2.13 mmQH=0,θc=0,K=961±8 m−1; and (b) Interference pattern of the stationary film at x=2.13 mm with QH=1.92 W,θc=1.23°,K=2015±24 m−1.
Grahic Jump Location
One corner of the CVBLT with the geometrical parameters. Relative distance, y, is along AB and film thickness δ is measured perpendicular to AB.
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Film thickness profiles at x=2.13 mm under different power inputs to the heater. The arrows represent oscillating film.
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Interference pattern of the oscillating film at x=2.34 mm with QH=1.79 W
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(a) Variation of the apparent contact angle with the power input to the heater at x=2.13 mm; and (b) Variation of the curvature with the power input to the heater at x=2.13 mm.
Grahic Jump Location
Variation of the apparent contact angle with the axial location for QH=1.79 W
Grahic Jump Location
Variation of the curvature with the axial location for QH=1.79 W. The solid lines are guides for the reader’s eye.
Grahic Jump Location
Variations of the apparent contact angles with the axial location at different power inputs to the heater
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Variation of the curvature with the axial location for QH=2.26 W. The solid line is a guide for the reader’s eye.
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Temperature profiles at different power inputs to the heater with Qc=4.35 W
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Local heat flow rates at x=1.21 mm at different power inputs to the heater with Qc=4.35 W
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A schematic of the macroscopic interfacial force balance for the oscillating film in the corner of the CVBLT when U>0,τ0<0
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Variations of the apparent contact angle and curvature with time at x=2.65 mm. The solid lines are guides for the reader’s eye.
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Variations of the apparent contact angle and curvature with time at x=2.98 mm. The solid lines are guides for the reader’s eye.
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Variation of the liquid-wall wetted length with time at x=2.65 mm. The solid line is a guide for the reader’s eye.
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Plot of contact line velocity in μm/s as a function of the change in the force due to contact angle [Δ cos θ(=cos θir−cos θi)]
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Plot of contact line velocity in μm/s as a function of the change in contact angle [θir−θi]

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