ISSN Online: 2688-7231
ISBN Online: 978-1-56700-478-6
Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)
INVESTIGATIONS ON FLOW INSTABILITIES IN SINGLE-CHANNEL NATURAL CIRCULATION SYSTEMS
Resumo
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.