Fragmentation of continuous molten copper droplets penetrating into sodium pool

Yang, Zhi; Zhang, Zhigang; Xing-Chao, Liu; Ahmed, Rabih

doi:10.1080/00223131.2018.1539350

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…Nishimura et al (2010) carried out the FCI experiment in the form of a single molten copper jet penetrating into a sodium pool and analyzed the fragmentation characteristics from hydraulic and thermal perspectives. The processes of a single molten copper droplet (Nishimura et al, 2007;Zhang et al, 2009;Zhang and Sugiyama, 2010;Zhang and Sugiyama, 2012) and continuous copper droplets (Yang et al, 2018;Yang et al, 2019) interacting with liquid sodium have also been studied, and a thermal fragmentation mechanism of sodium entrainment was proposed and fragmentation due to a sodium microjet was presented.…”

Section: Introductionmentioning

confidence: 99%

An improved multiphase SPH algorithm with kernel gradient correction for modelling fuel–coolant interaction

Wang

Zhang²,

Wu³

2023

Front. Energy Res.

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Fuel–coolant interaction (FCI) has a pivotal role in the development of core disruptive accident in a sodium-cooled fast reactor. The drastic deformation of multiphase interface in the FCI is hard to deal with in the traditional grid method. In this paper, an improved multiphase smoothed particle hydrodynamics (SPH) algorithm corrected with the kernel gradient correction (KGC) technique is presented for multiphase flow with a large density ratio and complex interfacial behaviors. The density discontinuity across the multiphase interface is described with the use of special volume, which only depends on the position information of adjacent particles. This multiphase SPH algorithm, which is troubled by an unstable and mixed-interface problem under a large density ratio, is significantly improved with the KGC technique. The accuracy and robustness of the improved method are demonstrated in the numerical simulations of the deformation of a square droplet, Rayleigh–Taylor instability, and bubble rising in water. The verified corrected multiphase SPH is applied to simulate the hydrodynamic behaviors of the general FCI and the interaction between fuels coated with stainless steel film and coolant. Boundary layer stripping, Rayleigh–Taylor instability, and Kelvin–Helmholtz instability are observed as important mechanisms of hydraulic fracturing. The fragments’ distribution and the influence of stainless steel film are analyzed. The existence of a stainless steel film has been shown to inhibit breakage.

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