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ISBN : 978-1-56700-478-6

Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)
2017, December 27-30 , BITS Pilani, Hyderabad, India

DYNAMIC AND STATIC INSTABILITIES IN TWO-PHASE FLOW SYSTEM

Get access DOI: 10.1615/IHMTC-2017.3140
pages 2249-2255

Abstract

Two-phase flow or thermal flow instabilities (e.g., pressure drop oscillations (PDOs)) can affect the safe operating condition and performance of the system efficiency, leads to mechanical vibrations and thermal oscillations, and can also lead to premature critical heat flux. The stability analysis of PDOs in a two-phase flow system using three equation models is carried out by MATCONT software. Further, using the same model, most prominent static instability (Ledinegg type) is investigated in the two-phase flow system. For analysis of Ledinegg instability and PDOs, the steady-state internal pressure drop of the heater channel is obtained by polynomial fitting. Time evolution of the system is carried out under perturbation, and following results are observed in the current system. In the presence of PDOs type instability, sustained oscillations of mass flow rate and pressure (inlet pressure) are investigated in the two-phase flow system. An excursion of equilibrium mass flow rate either to a higher or a lower mass flow rate dependent on the sign of perturbation are identified in the system due to Ledinegg type instability. Whereas, the pressure of surge tank or inlet pressure of heater channel is almost constant.
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