ICONE23-1410 SCALING OF THE STEADY STATE BEHAVIOUR OF RECTANGULAR SINGLE-PHASE NATURAL CIRCULATION WITH INCLINING HEAT SOURCE

抄録

In the present study, the steady state performance of a natural circulation loop with inclined heat source is investigated. The rectangular single phase natural circulation loop consists of a vertical cooling pipe, an inclined heating pipe and two horizontal pipes made of steel, connected by means of four 90° bends. The loop has an imposed heat flux in the heating section. The parameters investigated were: power transferred to the fluid, mass flow rate and inclinations of heating pipe. The generalized dimensionless groups are established which are useful in comparing the performances of different loops and to extend data from small scale loops to the prototype. The capability of the computer code ATHLET, developed by GRS, for predicting the stable behavior of single phase natural circulation loops is tested by simulating rectangular NCLs facilities. Then, the dimensionless groups of the present apparatus are developed based on Vijayan's model taking into account of the heating pipe inclinations. The steady-state analysis results show a good agreement with the correlation developed by this study, which suggests that simulation of the steady state flow in single phase NCLs can be well achieved by the non-dimensional parameter Re, Gr_m and N_G.