Study on the stability behaviour of two-phase natural circulation systems using a four-equation drift flux model

Numerical implementation, verification and validation of two-phase flow four-equation drift flux model with Jacobian-free Newton–Krylov method

“…The TASS/SMR system analysis code is developed based on a three-equation drift flux model (with an additional mass equation for the non-condensable gas) for the system-integrated modular advanced reactor, SMART (Chung et al, 2012;Chung et al, 2013). Drift flux models have also been widely used in the subchannel analysis of boiling water reactor (BWR) fuel bundles Khan and Yi, 1985; Hashemi-Tilehnoee and Rahgoshay, 2013a,b, BWR core simulators (Galloway, 2010), and two-phase flow instabilities analyses (Nayak, 2007;Wang et al, 2011).…”

Experimental investigation on two-phase thermosyphon loop with partially liquid-filled downcomer

“…The TPTL is capable of transferring heat with high heat flux over a relatively long distance, and maintains excellent isothermality. Consequently, the TPTL has been extensively used in some traditional fields, such as cooling of electronic components [2][3][4][5], light water reactors [6][7][8], and solar water heater systems [9][10][11][12][13][14][15][16].…”

Linear stability analysis of flow instabilities with a nodalized reduced order model in heated channel

“…The frequency domain approach [21] is associated with control-theory techniques, where transfer functions are obtained using Laplace transformation of the linearized model of governing equations. The stability of the system (linear stability characteristics with small perturbation) is then determined by the analyses of roots of the obtained transfer functions [9,10,12,13,15,22]. However, it is pointed out that this technique is not very useful for analyzing the nonlinear stability characteristics (for large perturbation) of the system due to the presence of linearized equations.…”

“…However, no proper internalization of two-phase friction factor calculation has been done. It is evident form past researches [15] that the accurate prediction of two-phase friction factor is very important because it significantly contributes towards the total pressure drop across the channel which helps to determine the stability of the system. It is also found that the prediction of two-phase friction factor is dependent on several parameters [39] namely hydraulic diameter of the channel, flow Reynolds number etc.…”