Experiments to determine the burnout heat flux in a simulated boiler tube are described. The principal independent variable is downcorner resistance to flow, measured by the parameter fL/D, and varied by adjusting a plug cock in the downcorner. The experimental results show an increase in burnout heat flux with increasing downcorner resistance, up to the point at which average flow reduction reverses this trend. The results are explained by the effect of downcorner resistance on the magnitude of flow oscillations, which begin to occur at heat fluxes less than the burnout heat flux, and which tend to promote the onset of burnout.

This content is only available via PDF.
You can access this article if you purchase or spend a download.