Improved Method for Calculating Turbulent Flow Heat Transfer in Central Channels of Gas Cooled Rod Bundles by Use of Temperature Profiles

摘要

The most recent experiments carried out at the Karlsruhe Nuclear Center (KfK) at gas cooled rod bundles have shown that the computer code SAGAP overestimates the surface rod temperatures in the central subchannels. This conclusion was also a result of the analysis performed with SAGAP at CNEN-DRV for the 6th Benchmark Meeting, held at Windscale in 1980, in the frame of the Italian activities for the OECD-NEA GCFR R and D Programme. Thus we developed and introduced in SAGAP a mathematical model at CNEN-DRV, the use of which allows a much better evaluation of the surface pin temperatures in the mentioned subchannels. This model is described in detail in the paper. Some comparisons between calculations and measurements are also presented. 16 figures. (ERA citation 08:005083)