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TECHNICAL NOTES

Augmentation of Thin Falling-Film Evaporation on Horizontal Tubes Using an Applied Electric Field

[+] Author and Article Information
J. Darabi, M. M. Ohadi, S. V. Dessiatoun

Enhanced Heat Transfer Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

J. Heat Transfer 122(2), 391-398 (Dec 02, 1999) (8 pages) doi:10.1115/1.521478 History: Received February 28, 1999; Revised December 02, 1999
Copyright © 2000 by ASME
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References

Gropp,  U., and Schlunder,  E. U., 1986, “The Effect of Liquid Side Mass Transfer on Heat Transfer and Selectivity During Surface and Nucleate Boiling of Mixtures in a Falling Film,” Chem. Eng. Process., 20, p. 103.
Chyu,  M. C., and Bergles,  A. E., 1987, “An Analytical and Experimental Study of Falling Film on a Horizontal Tube,” J. Heat Transfer, 109, pp. 983–990.
Palen,  J. W., Gropp,  U., and Schlunder,  E. U., 1986, “The Effect of Liquid-Side Mass Transfer on Heat Transfer and Selectivity During Surface and Nucleate Boiling of Mixtures in a Falling Film,” Chem. Eng. Process., 20, pp. 103–114.
Parken,  W. H., Fletcher,  L. S., Sernas,  V., and Han,  J. C., 1990, “Heat Transfer Through Falling Film Evaporation and Boiling on Horizontal Tubes,” J. Heat Transfer, 112, pp. 744–750.
Nakayama W., Daikoku, T., and Nakajima, T., 1982, “Enhancement of Boiling and Evaporation on Structured Surfaces With Gravity Driven Film Flow of R-11,” Proceedings of the 7th International Heat Transfer Conference, Vol. 4, Washington, DC, pp. 409–414.
Moeykens,  S. A., and Pate,  M. B., 1994, “Spray Evaporation Heat Transfer of R-134a on Plain Tubes,” ASHRAE Trans., 100, Part 2, pp. 173–184.
Moeykens,  S. A., and Pate,  M. B., 1995, “The Effects of Nozzle Height and Orifice Size on Spray Evaporation Heat Transfer Performance for a Low-Finned Triangular-Pitch Tube Bundle With R-134a,” ASHRAE Trans., 101, Part 2, pp. 408–419.
Moeykens,  S. A., Huebsch,  W. W., and Pate,  M. B., 1995, “Effects of Surface Enhancement, Film-Feed Supply, and Bundle Geometry Upon Spray Evaporation Heat Transfer Performance,” ASHRAE Trans., 101, Part 2, pp. 420–433.
Moeykens,  S. A., Huebsch,  W. W., and Pate,  M. B., 1995, “Heat Transfer of R-134a in Single-tube Spray Evaporation Including Lubricant Effects and Enhanced Surface Results,” ASHRAE Trans., 101, Part 1, pp. 111–123.
Panofsky, W. K. H., and Phillips, M., 1962, Classical Electricity and Magnetism, Addison-Wesley, Reading, MA.
Yamashita,  K., and Yabe,  A., 1997, “Electrohydrodynamics Enhancement of Falling Film Evaporation Heat Transfer and its Long Term Effect on Heat Exchanger,” J. Heat Transfer, ASME Transaction 119, pp. 339–347.
Darabi, J., Ohadi, M. M., and Dessiatoun, S. V., 1998, “Heat Transfer Enhancement With Falling Film Evaporation on Vertical Tubes Using Electric Fields,” Proceedings of the ASME-Heat Transfer Division, Vol. 1, ASME, New York, pp. 331–338.
Darabi, J., Ohadi, M. M., and Dessiatoun, S. V., 1999, “Falling Film and Spray Evaporation Enhancement Using Electric Fields,” Proceedings of the 5th ASME/JSME Joint Thermal Engineering Conference, Mar. 15–19, San Diego, CA, to be published.
Kline,  S. J., and McClinock,  F. A., 1953, “Describing Uncertainties in Single Sample Experiments,” Mech. Eng., 75, Jan., pp. 3–8.
Moffat,  R. J., 1988, “Describing the Uncertainties in Experimental Results,” ASME J. Fluids Eng., 107, pp. 250–260.
Bohn,  M. S., and Davis,  S. H., 1993, “Thermodynamic Breakdown of Falling Film at High Reynolds Numbers,” Int. J. Heat Mass Transf., 36, pp. 1875–1881.

Figures

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Schematic of the experimental setup
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Schematic diagram of the test chamber
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Schematic diagram of the test section
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Schematic diagram of the electrodes
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Comparison of the nonelectrohydrodynamic results with the open literature
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h versus applied voltage on a smooth tube and mesh electrode I
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h versus applied voltage on a smooth tube and mesh electrode II
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Effect of mesh opening size on film distribution
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h versus applied voltage at various heat fluxes with Turbo BIII tube
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h versus applied voltage at various flow rates with Turbo BIII tube
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h versus applied voltage at various heat fluxes with 19 fpi tube
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h versus applied voltage at various flow rates with 19 fpi tube
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h versus heat flux at oil concentration of one percent
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h versus flux at oil concentration 2.5 percent
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h versus heat flux at oil concentration five percent
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h versus applied voltage at various oil concentration
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h versus applied voltage at various oil concentration
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Electrohydrodynamic power consumption at oil concentration of one percent

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