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An analysis of bubble formation and fluid dynamics in pool boiling of propane on horizontal tubes.

Number: pap. ID31

Author(s) : WANG Y., LUKE A.

Summary

In this study, the bubble formation and fluid dynamics are investigated in pool boiling heat transfer of propane. The characteristic behaviour of nucleation sites during nucleate boiling, for example the local and temporal distribution of the nucleation sites and frequency on a sandblasted copper tube have been investigated from heat transfer measurements over selected heat fluxes and pressures using template-based evaluation of high speed video sequences. The raw-data of the evaluation of the video sequences is sorted and converted for the statistical analysis. The bubbles are tracked along their way sliding in the superheated liquid to obtain the influence of fluid dynamics on the pool boiling heat transfer. The bubble departure diameter and frequency are compared to some existing (semi-)empirical correlations of literature and a new model for the heat transfer near growing, departing and sliding bubbles. The calculated results for the bubble departure diameter as function of the azimuthal position on the tube according to the new model show a good agreement with the new experimental data. The relative increase of the active nucleation sites is described quite well. The influence of the convective effects is extended to consider them in empirical correlations for the design of tube bundles.

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Pages: 8 p.

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Details

  • Original title: An analysis of bubble formation and fluid dynamics in pool boiling of propane on horizontal tubes.
  • Record ID : 30012282
  • Languages: English
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02

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