Bubble behavior and pressure fluctuation during boiling are modeled for enhanced surfaces with surface pores and sub-surface channels. The hydraulic diameter of the channels is about 0.42 mm. It is assumed that the latent heat flux is solely generated by thin-film evaporation on the channel surface. The evaporation rate is given by a semi-empirical correlation including effects of surface tension and liquid viscosity. The activation pressure and the bubble departure size are different for different pores. The vapor pressure inside the bubble is related to the channel pressure by the orifice equation. The bubble growth rate is determined by a modified Rayleigh equation. The vapor mass in a given channel volume is given by the mass conservation equation. Thus the instantaneous channel pressure and vapor volume can be determined which, in turn, govern the dynamic processes of bubble initiation and growth on various pores. This model demonstrates for the first time the dynamic picture of boiling phenomena on enhanced surfaces, e.g. the instantaneous activation, growth and detachment of bubbles on various pores, the fluctuation of channel pressure and vapor mass etc.. The model has been tested for boiling of propane and isobutane on an enhanced tube. The predictions agree reasonably well with the experiments.
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ASME 2004 2nd International Conference on Microchannels and Minichannels
June 17–19, 2004
Rochester, New York, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4164-2
PROCEEDINGS PAPER
Modeling Bubble Behavior on a Heated Surface With Surface Pores and Sub-Surface Channels
Yuming Chen,
Yuming Chen
University of Stuttgart, Stuttgart, Germany
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Manfred Groll,
Manfred Groll
University of Stuttgart, Stuttgart, Germany
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Rainer Mertz
Rainer Mertz
University of Stuttgart, Stuttgart, Germany
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Yuming Chen
University of Stuttgart, Stuttgart, Germany
Manfred Groll
University of Stuttgart, Stuttgart, Germany
Rainer Mertz
University of Stuttgart, Stuttgart, Germany
Paper No:
ICMM2004-2377, pp. 523-530; 8 pages
Published Online:
December 2, 2008
Citation
Chen, Y, Groll, M, & Mertz, R. "Modeling Bubble Behavior on a Heated Surface With Surface Pores and Sub-Surface Channels." Proceedings of the ASME 2004 2nd International Conference on Microchannels and Minichannels. ASME 2nd International Conference on Microchannels and Minichannels. Rochester, New York, USA. June 17–19, 2004. pp. 523-530. ASME. https://doi.org/10.1115/ICMM2004-2377
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