Experimental and theoretical study of jet hydrodynamic breakup behavior with air entrainment

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article number107900
Journal / PublicationAnnals of Nuclear Energy
Online published16 Oct 2020
Publication statusOnline published - 16 Oct 2020


Molten jet breakup is a vital phenomenon during Fuel-Coolant Interaction (FCI), which can be strongly affected by hydrodynamic behaviors around the jet surface. When a liquid jet plunges into another liquid surface, air entrainment may occur and influence the jet breakup process. In this paper, the hydrodynamic breakup behavior of liquid jets accompanied by air entrainment is investigated experimentally and theoretically. Mercury and Benzyl benzoate is used as jet material with density ratios of 13.63 and 1.12 respectively. The experimental results show that the air is entrained into the water and wrapped around the liquid jet. The cause for this air entrainment phenomenon is the momentum loss of liquid jet when injecting into the water surface. In the low-density ratio cases, the air entrainment effect is more remarkable due to greater loss of jet momentum. This phenomenon has a delay effect to jet breakup process by preventing contact between the jet column and water. The existing correlations are not enough for predicting the jet breakup length with air entrainment. A revised correlation equation is proposed in which jet breakup length is the sum of maximum air void depth and the existed jet breakup length correlation. The proposed correlation shows good agreements with both the high-density ratio and the low-density ratio experimental results. Conclusions in this paper are helpful in understanding the hydrodynamic jet breakup behavior with air entrainment, offering the accidental scenarios an applicable reference.

Research Area(s)

  • FCI, Jet breakup, Air entrainment, Visual experiment, Theoretical analysis