LIF study of temporal and spatial fluid mixing in an annular downcomer

Li, Xing; Qi, Peiyao; Zhao, Tingjie; Qiao, Shouxu; Tan, Sichao

doi:10.1016/j.anucene.2018.11.006

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Cited by 12 publications

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“…Such studies allow us to clarify the temperature distribution at the core inlet and in the coolant circulation loops, which is especially important in the operation modes of a reactor with an asymmetric load [1][2][3][4]. The results of such studies are also necessary for calculating the distribution of boric acid concentration in the core when it is injected into the coolant [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Visualization of coolant flow in the model of a nuclear reactor pressure vessel

Dobrov¹,

Doronkov²,

Ryazanov³

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Visualization of coolant flow in the model of a nuclear reactor pressure vessel

Dobrov¹,

Doronkov²,

Ryazanov³

et al. 2020

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LIF-based quantification of the species transport during droplet impact onto thin liquid films

Ennayar,

Brockmann,

Hussong

2023

Exp Fluids

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In the present study, laser-induced fluorescence (LIF) is used to investigate the mixing process of a droplet impacting onto a thin liquid film. A robust multidimensional calibration procedure is developed enabling the extraction of local instantaneous dye concentrations as well as film heights. A series of validation measurements are conducted confirming a low reconstruction error of $$4.53\%$$ 4.53 % . The impact-induced mixing process is thoroughly investigated across various liquid film thicknesses to examine the propagation of the mixing zone and the instantaneous radial concentration gradients within it. It is shown that the maximum extent of the mixing zone scales inversely proportional with the thickness of the liquid film. Within our experiments, we discover the formation of wall-induced vortex ring instabilities subsequent to impact. The disintegration of vortex rings during droplet impact significantly enhances convection-driven mixing, as quantified by the coefficient of variation. Graphical abstract

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