A general correlation for critical heat flux in annuli

A general correlation for prediction of critical heat flux in vertical annuli is presented. It has been verified with over 800 data points for four fluids and found to have a mean deviation of 14%. Data include cylindrical and noncylindrical annuli with internal heating, external heating, and heating on both sides. Range of parameters covered includes reduced pressures from 0.017 to 0.9, mass flux from 100 to 16,000 kg per sq m-sec, inlet quality from -3.1 to 0.00, critical quality from -2.8 to +0.74, annular gap from 0.5 to 11.1 mm, and heated tube diameter from 1.5 to 96.5 mm.