Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (10): 100603-100603.doi: 10.11889/j.0253-3219.2019.hjs.42.100603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Study on flow friction characteristics of single-phase flow in annular narrow channel

Jun PENG   

  1. Naval Armament Department, Beijing 100841, China
  • Received:2019-02-27 Revised:2019-08-05 Online:2019-10-13 Published:2019-10-16
  • About author:PENG Jun, male, born in 1982, graduated from Naval University of Engineering in 2012 with a master's degree, focusing on nuclear safety, reactor operation research and management

Abstract: Background

Eccentricity in the manufacture and assembly of nuclear fuel assemblies will affect the annular channel.

Purpose

This study aims to investigate the characteristics of the single-phase flow in narrow annular channels.

Methods

Computational fluid dynamics (CFD) simulation on single-phase flow friction characteristic in straight annuli channel with different width (h=0.775~1.742 mm, 0.69<r i/r o<0.86) in ranges of laminar flow (300<Re<1 800) and fully developed turbulent flow (104<Re<105) were carried out by commercial code FLUENT. The influence of different eccentricity (e=0.01~0.5) was also considered.

Results

The results show that for laminar flow the simulated friction factors are completely agreed with that of the analytic solution. When the Reynolds number is in the range of 104~5×104, the Blausius correlation achieves more exact results with CFD; and while the Reynolds number is in the range of 5×104~105, the McAdams correlation gets more consistent results with CFD.

Conclusions

Based on the above conclusions, proposed correlation f=0.257 5Re -0.23 can well predict in the whole Reynolds number in the range of 104~105. Furthermore, the friction factor is a function of eccentricity, a relatively weak function of width, and independent of the Reynolds number.

Key words: Annuli channel, Flow friction, Single phase, Eccentricity

CLC Number: 

  • TL99