Experimental studying of vapor explosion triggering during the breakup of a molten salt jet

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Abstract

The paper presents an experimental study using high-speed video recording of the process of vapor explosion on a breakup jet of molten NaCl salt in water. The regimes of jet breakup into large parts, accompanied by the separation of small satellite droplets, have been studied. For the first time, the propagation of a vapor explosion on two large fragments of jet breakup due to spontaneous triggering of the process on a droplet-satellite was reproduced and recorded under laboratory conditions. The possibility of a vapor explosion occurring at the initial stage of the first stage of coarse crushing and mixing of the melt jet is shown.

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About the authors

N. V. Vasil’ev

Joint Institute for High Temperatures of the Russian Academy of Sciences; Bauman Moscow State Technical University (National Research University)

Author for correspondence.
Email: nikvikvas@mail.ru
Russian Federation, Moscow; Moscow

S. N. Vavilov

Joint Institute for High Temperatures of the Russian Academy of Sciences

Email: sergeynv@mail.ru
Russian Federation, Moscow

E. A. Lidzhiev

Joint Institute for High Temperatures of the Russian Academy of Sciences; Bauman Moscow State Technical University (National Research University)

Email: lind722k@gmail.com
Russian Federation, Moscow; Moscow

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2. Fig. 1. Propagation of a steam explosion during the disintegration of a jet of molten NaCl salt in water (water temperature tw = 23°C, salt temperature in the crucible tNaCl = 1100°C, jet similarity numbers Re = 2070, Oh = 1.4 ∙ 10–3). Exposure time is 4.5 μs. Time from the frame of the moment of jet disintegration (a): 1.11 ms (b); 1.87 (c); 1.99 (d); 2.02 (e); 2.03 (f); 2.05 (g); 2.08 (h); 2.34 ms (i). The white arrow indicates a satellite drop formed during the disintegration of the jet. The upper boundary of the frames corresponds to the water level in the container.

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