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 ›› 2009, Vol. 20 ›› Issue (2): 111-117 doi: 10.13538/j.1001-8042/nst.20.111-117

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Two-phase flow instability in a parallel multichannel system

HOU Suxia   

  1. Department of Physics, the Second Artillery Engineering Institute, Xi’an 710025, China
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HOU Suxia. Two-phase flow instability in a parallel multichannel system.Nuclear Science and Techniques, 2009, 20(2): 111-117     doi: 10.13538/j.1001-8042/nst.20.111-117


The two-phase flow instabilities observed in through parallel multichannel can be classified into three types, of which only one is intrinsic to parallel multichannel systems. The intrinsic instabilities observed in parallel multichannel system have been studied experimentally. The stable boundary of the flow in such a parallel-channel system are sought, and the nature of inlet flow oscillation in the unstable region has been examined experimentally under various conditions of inlet velocity, heat flux, liquid temperature, cross section of channel and entrance throttling. The results show that parallel multichannel system possess a characteristic oscillation that is quite independent of the magnitude and duration of the initial disturbance, and the stable boundary is influenced by the characteristic frequency of the system as well as by the exit quality when this is low, and upon raising the exit quality and reducing the characteristic frequency, the system increases its instability, and entrance throttling effectively contributes to stabilization of the system.

Key words: Flow instability, Parallel multichannel system, Stable boundary, Two phase flow, Flow oscillation