Simulation of Pendant Droplets and Falling Films in Horizontal Tube Absorbers

[+] Author and Article Information
Jesse D. Killion, Srinivas Garimella

George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

J. Heat Transfer 126(6), 1003-1013 (Jan 26, 2005) (11 pages) doi:10.1115/1.1833364 History: Received October 31, 2003; Revised June 08, 2004; Online January 26, 2005
Copyright © 2004 by ASME
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Grahic Jump Location
Illustration of piecewise linear reconstruction of interface, adapted from Ref. 65 (reproduced with permission from Elsevier). Smooth line shows actual interface (circle), numbers represent volume fractions.
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Domain of droplet and tube model showing boundary and initial conditions (not to scale, film thickness greatly exaggerated)
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Mesh used for three-dimensional model of tubes, shades of gray indicate partitioning for parallel computing
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Results of simulation of falling film on horizontal tubes [(a)–(c) 50 ms between frames, (c)–(d) 20 ms between frames, (d)–(h) 10 ms between frames]
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Visual comparison of experiment (left) with simulation (right) synchronized at impact [frames (a)–(g) 10 ms between frames, frames (g)–(p) 6 ms between frames]
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Comparison of droplet volume and surface area from analysis of video and simulation
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Investigation of grid independence using column-of-spheres model with 0.35 mm initial film thickness
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Comparison of experimental results with axisymmetric “column-of-spheres” models with various liquid inventories
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Photograph of droplet formation in a falling film of aqueous LiBr over 15.9 mm outer diameter horizontal tubes 12 (box illustrates typical domain of CFD model)



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