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TECHNICAL PAPERS: Evaporative Boiling and Condensation

Experimental Determination of the Effect of Disjoining Pressure on Shear in the Contact Line Region of a Moving Evaporating Thin Film

[+] Author and Article Information
Sashidhar S. Panchamgam, Shripad J. Gokhale, Joel L. Plawsky

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

Sunando DasGupta

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

Peter C. Wayner

The Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180e-mail: wayner@rpi.edu

J. Heat Transfer 127(3), 231-243 (Mar 24, 2005) (13 pages) doi:10.1115/1.1857947 History: Received March 01, 2004; Revised September 10, 2004; Online March 24, 2005
Copyright © 2005 by ASME
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Figures

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(a) Schematic diagram of the experimental setup and (b) cross-sectional view of the quartz cuvette (inside dimensions 3 mm×3 mm). Acceleration due to gravity g is acting perpendicular to the cross section.
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(a) Fringe pattern for an equilibrium isothermal extended corner meniscus of pentane at x=1.1 mm(Qin=0); (b) gray value profile for pentane at x=1.1 mm(Qin=0,δ0=48.9 nm); and (c) gray value profile for pentane at x=14.93 mm(Qin=0,δ0=60.2 nm)
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(a) Comparison of thickness profiles at x=1.1 and 14.93 mm (Qin=0), and (b) comparison of thickness profiles at x=1.1 and 14.93 mm near contact line region (Qin=0)
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Curvature profiles of the isothermal corner meniscus at two axial locations, x=14.93 and 22.87 mm (Qin=0)
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Curvature versus −(ρg/σ)(x0−x);(KT,x0=10,863 m−1 at x=1.1 mm)
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Comparison between theoretical [Eq. (12)] and experimentally obtained slopes of a liquid-vapor interface of pentane on quartz in a VCVB at x=1.11 mm(Qin=0)
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Fringe pattern for receding and advancing menisci, Receding meniscus: (a) 2.92 s, (b) 6.05 s, (c) 10.13 s; Advancing meniscus: (d) 52.63 s, (e) 56.71 s, (f) 61.47 s, and (g) 66.44 s
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Gray value profiles of the pentane meniscus at x≈10 mm during recession, at t=2.92 s,δ0=45.7 nm and at t=10.13 s,δ0=36.7 nm (nonisothermal)
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(a) Thickness profiles of the pentane meniscus at x≈10 mm during recession (nonisothermal) and (b) comparison of thickness profiles of the pentane meniscus at x≈10 mm during recession near the contact line region (nonisothermal)
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(a) Thickness profiles of the pentane meniscus at x≈10 mm during advancement (nonisothermal) and (b) comparison of thickness profiles of the pentane meniscus at x≈10 mm during advancement near the contact line region (nonisothermal)
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Adsorbed thickness δ0 versus time during receding and advancing movements of the pentane meniscus at x≈10 mm from the top of the cuvette (nonisothermal). Open circles represent data point and solid line shows the trend in the data.
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(a) Slope profiles for the receding meniscus of pentane at x≈10 mm (nonisothermal) and (b) slope profiles for the advancing meniscus of pentane at x≈10 mm (nonisothermal)
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(a) Curvature profiles for the receding meniscus of pentane at x≈10 mm (nonisothermal) and (b) curvature profiles for the advancing meniscus of pentane at x≈10 mm (nonisothermal)
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(a) Liquid pressure versus distance for the receding meniscus of pentane at x≈10 mm (nonisothermal, Pv=593 mm of Hg at Tquartz,x≈10 mm=31.5°C) and (b) liquid pressure versus distance for the advancing meniscus of pentane at x≈10 mm (nonisothermal)
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Schematic of the control volume of an evaporating corner meniscus for macroscopic interfacial force balance
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(a) Absolute value of average shear stress during recession against δ0 and (b) absolute value of average shear stress during advancement against δ0. A parabolic profile is fitted to show the trend in τ0 (δ0).
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Dimensionless shear stress, τ0L0/σ, versus dimensionless disjoining pressure, −B/σδ03. × represents receding meniscus and ○ represents advancing meniscus.

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