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Research Papers: Evaporation, Boiling, and Condensation

Boiling Under Hele-Shaw Flow Conditions: The Occurrence of Viscous Fingering

[+] Author and Article Information
Felix Reinker

Department of Mechanical Engineering,
Muenster University of Applied Sciences,
Stegerwaldstr. 39,
Steinfurt 48565, Germany
e-mail: f.reinker@fh-muenster.de

Marek Kapitz

Mem. ASME
Department of Mechanical Engineering,
Muenster University of Applied Sciences,
Stegerwaldstr. 39,
Steinfurt 48565, Germany
e-mail: m.kapitz@fh-muenster.de

Stefan aus der Wiesche

Mem. ASME
Department of Mechanical Engineering,
Muenster University of Applied Sciences,
Stegerwaldstr. 39,
Steinfurt 48565, Germany
e-mail: wiesche@fh-muenster.de

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 27, 2014; final manuscript received July 29, 2015; published online September 2, 2015. Assoc. Editor: Keith Hollingsworth.

J. Heat Transfer 138(2), 021501 (Sep 02, 2015) (8 pages) Paper No: HT-14-1046; doi: 10.1115/1.4031233 History: Received January 27, 2014; Revised July 29, 2015

Boiling and bubble dynamics were experimentally investigated in a Hele-Shaw flow cell using pure water at atmospheric pressure as the working fluid. The resulting vapor bubble shapes were recorded by means of a high-speed camera for several plate spacings and heating power levels. It was found that viscous fingering phenomena of vapor bubbles occurred only under very special boiling conditions and cell parameters. The evaporation front velocity was identified as a major parameter for the onset of viscous fingering. The observed basic viscous fingering dynamics was in reasonable agreement with theoretical analyses. In addition to that classical viscous large fingering, small-scale evaporation instability was observed leading to microscopic roughening of accelerating evaporation fronts. This instability might be explicitly related to evaporative heat and mass transfer effects across the fast-moving phase interface.

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Figures

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Fig. 1

Scheme of the experimental setup (a) and concept of the realized setup (b)

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Fig. 2

Photography of the realized experimental setup (without thermal insulation)

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Fig. 3

Heating device for the Hele-Shaw test section (copper rod)

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Fig. 4

Bubble dynamics in the case of large spacing (b = 5 mm, qw = 148 kW/m2). Side view (a) and top view (b)

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Fig. 5

Bubble dynamics in the case of moderate spacing (b = 1 mm, qw = 148 kW/m2). Side view (a) and top view (b)

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Fig. 6

Bubble dynamics in the case of small spacing (b = 0.8 mm, qw = 148 kW/m2, Δt = 8 ms)

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Fig. 7

Bubble dynamics in the case of small spacing (b = 0.5 mm, qw = 148 kW/m2, Δt = 6 ms)

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Fig. 8

Bubble dynamics in the case of small spacing (b = 0.4 mm, qw = 148 kW/m2, Δt = 2 ms)

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Fig. 9

Bubble dynamics in the case of small spacing (b = 0.3 mm, qw = 148 kW/m2, Δt = 1 ms)

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Fig. 10

Viscous fingering during bubble growth (b = 0.4 mm, qw = 124 kW/m2, Tw = 104 °C, Tam = 97 °C, Δt = 0.286 ms)

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Fig. 11

Detailed view of a bubble with fingering phenomenon (b = 0.4 mm, qw = 124 kW/m2)

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Fig. 12

Fingering during explosive bubble growth (b = 0.15 mm, qw = 120 kW/m2, Tw = 104 °C, Tam = 93 °C)

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Fig. 13

Detailed view of a bubble with small-scale fingering phenomenon (b = 0.15 mm, qw = 120 kW/m2)

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Fig. 14

Illustration of instability onset (b = 0.2 mm)

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