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Research Papers: Evaporation, Boiling, and Condensation

Boiling Heat Transfer to Dilute Emulsions From a Vertical Heated Strip

[+] Author and Article Information
Matthew L. Roesle, David L. Lunde

Mem. ASME
Department of Mechanical Engineering,
University of Minnesota,
Minneapolis, MN 55455

Francis A. Kulacki

Fellow ASME
Department of Mechanical Engineering,
University of Minnesota,
Minneapolis, MN 55455
e-mail: kulac001@umn.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 28, 2013; final manuscript received December 11, 2014; published online February 3, 2015. Assoc. Editor: Cila Herman.

J. Heat Transfer 137(4), 041503 (Apr 01, 2015) (8 pages) Paper No: HT-13-1377; doi: 10.1115/1.4029456 History: Received July 28, 2013; Revised December 11, 2014; Online February 03, 2015

Heat transfer measurements for nucleate pool boiling of a dilute emulsion on a short vertical surface are reported. The vertical surface is a thin steel ribbon of 1.35 mm height × 101 mm length. Direct current resistance heating produces boiling either on the surface or in the free convection boundary layer of dilute emulsions of pentane in water and FC-72 in water. Single phase and boiling heat transfer is measured for emulsions with a volume fraction of the dispersed component of 0.1% and 0.5% in a pool at approximately 25 °C. The dispersed component is created by a simple atomization process and no surfactants are employed to maintain the droplets of the dispersed phase in suspension. In free convection, the presence of the dispersed component somewhat impedes heat transfer, but when boiling commences enhancement of heat transfer is observed. Boiling is observed in the emulsions at lower surface temperatures than for water alone, and significantly more superheat is required to initiate boiling of the dispersed component than would be needed for a pool of the dispersed component alone. Consequently, a temperature over shoot is observed prior to initiation of boiling, and such an over shoot has been observed in several prior studies. Boiling heat fluxes are compared to recently published measurements of boiling in similar emulsions on a small diameter horizontal wire. Boiling generally occurs at a slightly higher degree of superheat of the dispersed component on the heated strip as compared to thin wires.

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References

Roesle, M. L., and Kulacki, F. A., 2012, “An Experimental Study of Boiling in Dilute Emulsions, Part A: Heat Transfer,” Int. J. Heat Mass Transfer, 55(7–8), pp. 2160–2165. [CrossRef]
Roesle, M. L., and Kulacki, F. A., 2012, “An Experimental Study of Boiling in Dilute Emulsions, Part B: Visualization,” Int. J. Heat Mass Transfer, 55(7–8), pp. 2166–2172. [CrossRef]
Mori, Y. H., Inui, E., and Komotori, K., 1978, “Pool Boiling Heat Transfer to Emulsions,” ASME J. Heat Transfer, 100(4), pp. 613–617. [CrossRef]
Bulanov, N. V., Gasanov, B. M., and Turchaninova, E. A., 2006, “Results of Experimental Investigation of Heat Transfer With Emulsions With Low-Boiling Disperse Phase,” High Temp., 44(2), pp. 267–282. [CrossRef]
Bulanov, N. V., and Gasanov, B. M., 2007, “Special Features of Boiling of Emulsions With a Low-Boiling Dispersed Phase,” Heat Transfer Res., 38(3), pp. 259–273. [CrossRef]
3M, Inc., 2000, Fluorinert Electronic Liquid FC-72TM, Product Information, 3M, Inc., Specialty Materials, St. Paul, MN.
Bulanov, N. V., 2001, “An Analysis of the Heat Flux Density Under Conditions of Boiling Internal Phase of Emulsion,” High Temp., 39(3), pp. 462–469. [CrossRef]
Roesle, M. L., and Kulacki, F. A., 2010, “Boiling of Dilute Emulsions—Toward a New Modeling Framework,” Ind. Eng. Chem. Res., 49(11), pp. 5188–5196. [CrossRef]
Bulanov, N. V., Skripov, V. P., and Khmyl'nin, V. A., 1984, “Heat Transfer to Emulsion With Superheating of Its Disperse Phase,” J. Eng. Phys., 46(1), pp. 1–3.
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Lunde, D. M., 2011, “Boiling Dilute Emulsions on a Heated Strip,” M.S. thesis, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN.
Churchill, S. W., and Chu, H. H. S., 1975, “Correlating Equations for Laminar and Turbulent Free Convection From a Vertical Plate,” Int. J. Heat Mass Transfer, 18(11), pp. 1323–1329. [CrossRef]
Roesle, M. L., 2010, “Boiling of Dilute Emulsions,” Ph.D. thesis, University of Minnesota, Minneapolis, MN.
Gale, W. F., and Totemeir, T. C., eds., 2008, Smithells Metals Reference Book, 8th ed., Elsevier, New York.
Lemmon, E. W., McLinden, M. O., and Friend, D. G., “Thermophysical Properties of Fluid Systems,” NIST Chemistry WebBook (NIST Standard Reference Database Number 69), P. J.Linstrom, and W. G.Mallard, eds., National Institute of Standards and Technology, Gaithersburg, MD, http://webbook.nist.gov

Figures

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Fig. 1

Apparatus diagram (a) and heating system schematic [1] (b)

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Fig. 2

Heat transfer for heated strip in water (a) and time evolution of surface and bulk temperatures (b)

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Fig. 3

Comparison of measured single-phase natural convection to Churchill–Chu correlation (Eq. (1)). Fluid properties of water are used to evaluate Eq. (1).

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Fig. 4

Heat transfer for heated strip in FC-72 in water emulsions (a) and time evolution of surface and bulk temperatures (b)

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Fig. 5

Heat transfer for heated strip in pentane in water emulsions (a) and time evolution of surface and bulk temperatures (b)

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Fig. 6

Boiling curves of emulsions with small degree of subcooling (ΔTsub ∼ 11–13 °C). Closed symbols are pentane in water emulsions of this study; open and gray symbols are pentane and FC-72 in water emulsions, respectively, boiling on a heated wire [1]; lines are diethyl ether in water emulsions [4].

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Fig. 7

Boiling curves of emulsions with large degree of subcooling (ΔTsub ∼ 23–34 °C). Closed and gray symbols are FC-72 in water emulsions of this study; open symbols are FC-72 in water emulsions boiling on a heated wire [1]; lines are R-113 in water emulsions [4].

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