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Experimental investigation of convective structure evolution and heat transfer in quasi-steady evaporating liquid films
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10.1063/1.4711368
/content/aip/journal/pof2/24/5/10.1063/1.4711368
http://aip.metastore.ingenta.com/content/aip/journal/pof2/24/5/10.1063/1.4711368

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the fluid handling system.

Image of FIG. 2.
FIG. 2.

Cross section of the PTFE test chamber. The chamber inside diameter was 11.9 cm and the distance from the copper surface to the window was 8.1 cm.

Image of FIG. 3.
FIG. 3.

Cross-sectional and isometric drawings of the copper substrate. The substrate was 2.5 cm thick and 12.7 cm in diameter.

Image of FIG. 4.
FIG. 4.

Schlieren images of example experiment. Dichloromethane subject to 3.9 °C superheat. (a) Highly transient cells, 2.7 mm thick film, 300 s elapsed time. (b) Stable, regular cells, arrows indicate splitting cells, 1.9 mm thick, 950 s elapsed. (c) Transition to vermicular structures, 1.4 mm thick, 1350 s elapsed. (d) Fully vermicular structures, 1.1 mm thick, 1525 s elapsed. (e) Transition to non-disturbed film, 0.98 mm thick, 1575 s elapsed.

Image of FIG. 5.
FIG. 5.

Measured thickness (top), evaporative heat flux (middle), and instability wavelength (bottom) time histories for example experiment. Dichloromethane film, superheat level 3.9 °C. The letters correspond to the images in Fig. 4.

Image of FIG. 6.
FIG. 6.

Non-dimensional number time histories for the example experiment. Top: Nusselt number. Middle: Rayleigh number. Bottom: Marangoni number. The letters correspond to the images in Fig. 4.

Image of FIG. 7.
FIG. 7.

Impact of buoyancy effects on heat transfer for the example experiment. The letters correspond to the images in Fig. 4.

Image of FIG. 8.
FIG. 8.

Impact of buoyancy effects on normalized wavelength for the example experiment. The letters correspond to the images in Fig. 4.

Image of FIG. 9.
FIG. 9.

Impact of buoyancy on heat flux for all working fluids.

Image of FIG. 10.
FIG. 10.

Fixed surface, non-evaporating experimental results from Villarroel20 compared to the current experimental results.

Image of FIG. 11.
FIG. 11.

Variation of heat flux versus Marangoni number for all dichloromethane tests. The solid markers indicate instability transitions. Note the significant variation in the critical Marangoni numbers.

Image of FIG. 12.
FIG. 12.

Impact of buoyancy on instability wavelength for select working fluids. Top: each line represents an individual test. Bottom: averaged for each fluid.

Image of FIG. 13.
FIG. 13.

Comparison of modeled wave number dependence on Rayleigh Number from Catton29 with current experimental results (averaged for each fluid).

Tables

Generic image for table
Table I.

Working fluid properties at 10 °C.

Generic image for table
Table II.

Measured transition Rayleigh and Nusselt number values for each working fluid.

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/content/aip/journal/pof2/24/5/10.1063/1.4711368
2012-05-04
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental investigation of convective structure evolution and heat transfer in quasi-steady evaporating liquid films
http://aip.metastore.ingenta.com/content/aip/journal/pof2/24/5/10.1063/1.4711368
10.1063/1.4711368
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