Numerical study on flow andheat transfer characteristics in therod bundle channels under super critical pressure condition
Title of Paper:
Numerical study on flow andheat transfer characteristics in therod bundle channels under super critical pressure condition
Summary:
In this study, the 3D flow and heat transfer characteristics in rod bundle channels of the super critical
water-cooled reactor were numerically investigated using CFX codes. Different turbulent models were
evaluated and the flow and heat transfer characteristics in different typical channels were obtained.
The effect of pitch-to-diameter ratio (P/D) on the distributions of surface temperature and heat transfer
coefficient (HTC) was analysed. For typical quadrilateral channel, it was found that HTC increases with P/
D first and then decreases significantly when P/D is <1.4. There exists a ‘‘flat region” at the maximum
value when P/D is 1.4. If P/D is larger than 1.4, heat transfer deterioration (HTD) occurs as main stream
enthalpy is quite small. Furthermore, the HTD under low mass flow rate and the non-uniformity of circumferential
temperature were also discussed.
Co-author:
Xingbo Yang, Guanghui Su, Wenxi Tian et al.
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