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Report No.

Development of entrainment correlation for very low gas velocity

Yoshida, Kazuo 

Entrainment of liquid droplets from a bubbling or boiling pool surface is one of important phenomena for analysis of accidents postulated in nuclear installations. The Kataoka-Ishii correlation, which is based on a mechanistic modeling, has been developed for application to wide range of phenomena. These includes heat and mass transfer processes during loss-of-coolant accidents and radioactive carryover form flashing water pool caused by containment failure during a severe accident. In case of nuclear fuel facilities, radioactive material transport with liquid droplets entrained by very low steam flow velocity is also important in boiling event of radioactive solution storage tank caused by the loss of cooling function. Kataoka-Ishii correlation is however not applied to that analysis directly because of out of range of gas velocity. Therefore, a correlation has been developed analytically with considering features of phenomena of entrainment with very low gas velocity (Stokes regime).



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