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Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)

ISSN: 2688-7231 (Online)

INVESTIGATIONS ON FLOW INSTABILITIES IN SINGLE-CHANNEL NATURAL CIRCULATION SYSTEMS

Kumar Naveen
Reactor Engineering Division BARC, Trombay, Mumbai - 400085

Arun Kumar Nayak
Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, Maharashtra, India; Reactor Engineering Division, Bhabha Atomic Research Centre, Mumbai-400085, India

DOI: 10.1615/IHMTC-2017.890
pages 635-642

Abstract

Natural circulation systems are prone to several types of flow instabilities under some of the operating conditions. A reliable prediction of stable and unstable operating regimes is of paramount importance for successful deployment of these systems. In the present stud, a system analysis model, based on HEM approach has been developed and a semi-implicit scheme with adaptive time step has been used to solve the governing equations. The proposed numerical scheme predicts the system stability behaviour adequately for a wide range of nodalizations, a key requirement for analysis of natural circulation based systems. Paper describes the mathematical model and its application to single-channel natural circulation systems. The mechanism for type-I and Type-II density wave oscillation has been discussed.

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