0
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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 2

Photography of the realized experimental setup (without thermal insulation)

Grahic Jump Location
Fig. 1

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

Grahic Jump Location
Fig. 3

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

Grahic Jump Location
Fig. 9

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

Grahic Jump Location
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)

Grahic Jump Location
Fig. 6

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

Grahic Jump Location
Fig. 7

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

Grahic Jump Location
Fig. 8

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

Grahic Jump Location
Fig. 4

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

Grahic Jump Location
Fig. 5

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

Grahic Jump Location
Fig. 12

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

Grahic Jump Location
Fig. 13

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

Grahic Jump Location
Fig. 11

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

Grahic Jump Location
Fig. 14

Illustration of instability onset (b = 0.2 mm)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In