## Abstract

The paper describes tests boiling R113 at atmospheric pressure in upward flow over a 17 row column of square pitched electrically heated tubes. Uniform heat fluxes of 10-65 kW m^{-2} and maximum Reynolds numbers, Re^{max}, between 7800 and 27 000 were used. The data at the lower heat fluxes of 10 and 20 kW m^{-2} consistently exhibited a linear increase of heat transfer coefficient, h, with quality, the slope lower at 20 kW m^{-2}, so that h at 10 kW m^{-2} exceeded that at 20 kW m^{-2} and both reached h at 40 kW m^{-2} for the maximum quality tested. At the higher heat fluxes a nucleate boiling controlled region was observed at low quality, with h equal to the value at the same heat flux as observed with an isolated tube in a pool, followed by a rise in h at higher quality. The results were compared with the work of other researchers. Heat transfer coefficients for q = 40 kW m^{-2} were predicted to an average r.m.s. deviation of 7%, using the asymptotic flow boiling model. However, the sensitivity of h to change of quality and flowrate predicted was much lower than measured and in some cases exhibited opposite trends. © 2005 Institution of Chemical Engineers.

Original language | English |
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Pages (from-to) | 527-538 |

Number of pages | 12 |

Journal | Chemical Engineering Research and Design |

Volume | 83 |

Issue number | 5 A |

DOIs | |

Publication status | Published - May 2005 |

## Keywords

- 2-phase flow
- Boiling models
- Cross-flow heat transfer