Numerical and CFD analysis of inclination angle effects on natural circulation mini-loop performance
Author(s):
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
This research simulated the natural circulation in a mini-loop using numerical calculations performed with a FORTRAN code and CFD simulations via Ansys Fluent. A stability map of the loop was derived, and the impact of the loop’s inclination angle on this stability map was examined. The findings indicate that at low power levels, particularly functional powers, the loop’s inclination angle does not significantly affect the stability map. The results of the numerical calculations were compared with Vijayan's experimental corrections for this mini-loop, showing good agreement within its functional power range. Additionally, a comparison was made between the numerical calculations and the Ansys Fluent simulation results, which also demonstrated a good agreement, thereby confirming the accuracy of the calculations. Two significant thermo-hydraulic parameters -the mass flow rate and temperature difference at the two heater heads- were calculated and compared for different loop inclinations. It was observed that increasing the inclination angle results in a decrease in the fluid’s mass flow rate and an increase in the temperature difference at the ends of the heat source. Notably, it was determined that achieving a specific temperature difference across the heat source does not necessarily require adjusting the power levels; simply changing the inclination angle is sufficient. Another important result of this research is that by making a series of straightforward assumptions, one-dimensional computations can be solved very precisely, thereby saving computation time.
Keywords:
Language:
English
Published:
Radiation Physics and Engineering, Volume:6 Issue: 2, Spring 2025
Pages:
23 to 34
https://www.magiran.com/p2832760
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