Conference Proceedings Paper
IMPROVED ANNULAR FLOW DRYOUT MODEL IN THE SUBCHANNEL CODE ASSERT
13th International Conference on CANDU Fuel - 2016 Aug. 15-18
M. Shawkat (AMEC Foster Wheeler Nuclear Canada)
A. Tahir (AMEC Foster Wheeler Nuclear Canada)
H. Hasanein (AMEC Foster Wheeler Nuclear Canada)
The annular film dryout model was modified to capture the effect of fuel bundle appendages on the CHF. The deposition mass transfer coefficient was re-modeled in the appendaged subchannels to capture the effect of the increase in the core vapour turbulence and its effect on the droplet dispersion. In the un-appendaged subchannels the deposition mass transfer coefficient was modified to account for the effect of vapor kinetic energy diffusion from the surrounding appendaged subchannels. The flow conditions that cause the liquid film to pass the appendages were identified as function of the ratio between the liquid and the vapour momentum upstream the appendage location. In general, if the liquid film has sufficient momentum to pass the appendage, the model presents a new correction factor for deposition mass transfer coefficient upstream of the appendage that is exponentially depends on the decay of the vapor turbulence kinetic energy downstream of the appendage.
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