Turbulent temperature fluctuation and heat transfer to a metal surface resulting from the mixing of cold and hot water

Turbulent temperature fluctuation resulting from the mixing of cold and hot water was studied at 6.9*10/sup 6/ pascal (68 atm) around a simulated Boiling Water Reactor feedwater nozzle blend radius. The resulting heat transfer to the nozzle surface was investigated. This study shows that the instantaneous heat transfer coefficient varies from 30 percent of the steady-state value to five times the steady-state value. A discussion is given for the application of the above findings to a steady-state, two-dimensional turbulent boundary layer. The application of this information to metal surface fatigue life estimation is briefly explained. 11 refs