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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Optical Evaluation of the Effect of Curvature and Apparent Contact Angle in Droplet Condensate Removal

[+] Author and Article Information
Ying-Xin Wang, Ling Zheng, Joel L. Plawsky, Peter C. Wayner

The Isermann Department of Chemical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590

J. Heat Transfer 124(4), 729-738 (Jul 16, 2002) (10 pages) doi:10.1115/1.1466460 History: Received December 04, 2000; Revised October 22, 2001; Online July 16, 2002
Copyright © 2002 by ASME
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Figures

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A schematic drawing of three different regions of the vertical CVB
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The completely wetting ethanol film in the initial cell with a contact angle θ=0
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The partially wetting ethanol film in the modified cell with a contact angle θ=4.9 deg (x=3 mm)
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Dropwise condensation in Region III
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Macroscopic force balance
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One of the corners of a container with a vertex angle, α
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Typical interference fringes for a curved thin film of pentane in the corner of the cell
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Film thickness profiles of pentane in the corner of the cell
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Comparison of analyzed experimental curvature profiles with modeling results based on Eq. (9)
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Theoretical film thickness profiles showing theoretical locations of dark fringes for different curvatures with θc=0 deg obtained using Eq. (7)
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Theoretical film thickness profiles showing theoretical locations of dark fringes for different apparent contact angles for K=3000 m−1 obtained using Eq. (7)
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Coordinate transformation for the drop on the flat surface
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Comparison of thickness profiles of ethanol film on the initial and modified surfaces (x=3 mm)
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(a) Dropwise condensation of ethanol at x=3 mm(t=0 sec); (b) Dropwise condensation of ethanol at x=3 mm(t=0.27 sec); and (c) Dropwise condensation of ethanol at x=3 mm(t=0.33 sec).
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Case I: Dropwise condensation at lower condensation rate (x=3 mm)
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(a) Case II: Dropwise condensation at higher condensation rate: an extension of the picture is given in Fig. 16(b) (x=6 mm); (b) Case II: Spreading liquid film in the corner which shows the extension of Fig. 16(a) (x=6 mm).
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Film thickness profiles in the corner
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Film thickness profiles at the mid-plane of the drops

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