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TECHNICAL PAPERS: Boiling and Condensation

Study of Subcooled Film Boiling on a Horizontal Disc:1 Part 2—Experiments

[+] Author and Article Information
D. Banerjee, V. K. Dhir

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095

J. Heat Transfer 123(2), 285-293 (Oct 31, 2000) (9 pages) doi:10.1115/1.1345890 History: Received January 20, 2000; Revised October 31, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic diagram of experimental apparatus
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Digital image of non-departing bubbles arranged on concentric rings on a horizontal circular plate for superheat of 52°C and subcooling of 42°C obtained from a single frame of movie. Camera angle: 10 deg to the horizontal. Test-Fluid: PF-5060. About 5 percent of the bubbles were found to depart by merger of contiguous bubbles caused by natural convection circulation induced into the liquid pool from the side walls.
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Comparison of prediction for most probable values of rn for different rings with the experimental measurements
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Comparison of prediction for most probable values of rn with the experimental measurements of number of crests in a ring
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Comparison of shapes of vapor bubbles obtained from experiments with numerical predictions of interface shape for subcooled film boiling of PF-5060 at a wall superheat of ΔTW=100°C and ΔTsub=10°C. The pictures are at 1.2 ms intervals starting at 39.1 ms from the detected formation of the vapor bulge.
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Comparison of experimental data (denoted by various marker symbols) with numerical predictions (denoted by solid line) for temporal variation of bubble height for wall superheat, ΔTW=100°C and liquid subcoolings, ΔTsub=5°C. The dotted line represents prediction from linear stability theory.
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Comparison of experimental data (denoted by various marker symbols) with numerical predictions (denoted by solid line) for temporal variation of bubble height for wall superheat, ΔTW=100°C and liquid subcoolings, ΔTsub=10°C. The dotted line represents prediction from linear stability theory.
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Comparison of experimental data (denoted by various marker symbols) with numerical predictions (denoted by solid line) for temporal variation of bubble growth rate with bubble height. The dotted line represents prediction of growth rate, ωdf, from linear stability theory.
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Comparison of experimental data (denoted by various marker symbols) with numerical predictions (denoted by solid line) for temporal variation of bubble growth rate with bubble height. The dotted line represents prediction of growth rate, ωdf, from linear stability theory.
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Comparison of predictions for NuW̿ with experimental data for wall super-heat, ΔTW=100°C, and liquid subcooling up to ΔTsub=22°C
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Sample results from two-dimensional, PTV experiments showing the spatial distribution of velocity vectors at a particular instant. The frames are 4 ms apart. The protrusions depict outline of two vapor bubbles.
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Comparison of predictions for Nu̿ from numerical results of Banerjee et al. 10 for B/H=0 and B/H=0.24 with steady-state experimental data from Table 2. Correlction of Fishenden and Saunders 13 has been plotted as “Eq. (7)” and Correlation of Chavanne et al. 14 has been plotted as “Eq. (8).” Extrapolated trend lines for numerical predictions of Banerjee et al. 10 are also shown.

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