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Flow Characteristics in an Open Two-Phase Natural Circulation Loop

[+] Author Affiliations
Xiaofan Hou, Zhongning Sun, Guangming Fan, Jiguo Tang, Jiqiang Su

Harbin Engineering University, Harbin, China

Paper No. ICONE22-30549, pp. V02BT09A004; 8 pages
doi:10.1115/ICONE22-30549
From:
  • 2014 22nd International Conference on Nuclear Engineering
  • Volume 2B: Thermal Hydraulics
  • Prague, Czech Republic, July 7–11, 2014
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-4591-2
  • Copyright © 2014 by ASME

abstract

The flow characteristics of an open single-tube (Φ38×2000 mm), two-phase natural circulation (TPNC) loop was investigated, under the condition of constant saturated temperature at the atmosphere (99±0.5°C) at the inlet of heating tube. Five typical circulation modes are observed in the range of experiment heating power (from 2.8 kW to 34.8kW), namely intermittent flashing oscillation, geysering and flashing induced oscillation, flashing boiling eruption and flashing induced oscillation, sustained flashing and steady two-phase flow. It was shown that flashing and geysering or boiling eruption are predominant factors influencing flow characteristics. Moreover, a calculation model is developed to investigate the static flow characteristics of the TPNC system. The calculation results show a good agreement with the experiments. In addition, the calculation results show that the static flow excursion phenomenon may occurs in the open TPNC system, under the higher heating powers.

Copyright © 2014 by ASME
Topics: Flow (Dynamics)

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