# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (10): 149

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

### Thermal-hydraulic performance analysis of a subchannel with square and triangle fuel rod arrangements using the entropy generation approach

S. Talebi 1 , M. M. Valoujerdi 1

1. 1 Department of Energy Engineering and Physics, Amirkabir University of Technology, 424 Hafez Avenue, P.O. Box 15875-4413, Tehran, Iran
• Contact: S. Talebi E-mail:sa.talebi@aut.ac.ir
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S. Talebi, M.M.Valoujerdi. Thermal-hydraulic performance analysis of a subchannel with square and triangle fuel rod arrangements using the entropy generation approach.Nuclear Science and Techniques, 2017, 28(10): 149
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Abstract:

The present paper discusses entropy generation in fully developed turbulent flows through a subchannel, arranged in square and triangle arrays. Entropy generation is due to contribution of both heat transfer and pressure drop. Our main objective is to study the effect of key parameters such as spacer grid, fuel rod power distribution, Reynolds number Re, dimensionless heat power x, lengthto- fuel-diameter ratio k, and pitch-to-diameter ratio n on subchannel entropy generation. The analysis explicitly shows the contribution of heat transfer and pressure drop to the total entropy generation. An analytical formulation is introduced to total entropy generation for situations with uniform and sinusoidal rod power distribution. It is concluded that power distribution affects entropy generation. A smoother power profile leads to less entropy generation. The entropy generation of square rod array bundles is more efficient than that of triangular rod arrays, and spacer grids generate more entropy.