EVALUATION OF CHF CORRELATIONS FOR NONUNIFORM AXIALLY HEATED TUBES IN STEAM GENERATOR


37th Annual CNS Conference - 2017 June 04-07

Presented at:
37th Annual CNS Conference
2017 June 04-07
Location:
Niagara Falls
Session Title:
1A6 - Thermalhydraulics (I)

Authors:
N. Almalki (University of Guelph)
W. Ahmed (University of Guelph)
  

Abstract

The CHF has been investigated by many researchers worldwide experimentally and numerically for different parameters such as configuration (vertical, horizontal or inclined pipe) different pressures, mass fluxes and fluids and so on. In particular, studying the CHF under the real conditions in steam generators in which the heat flux is not uniform has not been studied well. Therefore, this research work is to evaluate the available CHF correlations that can predict the critical heat flux phenomenon in a non-uniform axially heated vertical tube. Four groups of CHF correlations were found in the literature and evaluated subsequently: local condition hypothesis, inlet condition hypothesis, F-Factor method and boiling average length approach. The evaluated results were compared to a reported CHF in steam generator. It was found that the inlet condition hypothesis gives good estimation for the experimental data. However, Bowering correlation based on the local condition hypothesis is more consistent with the reported CHF. Further, more works need to be done for CHF in large tube diameter.

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