The Thermomechanical Mechanism of Fine Fragmentation of Liquid Droplets under Conditions of Vapor Explosion

Zeigarnik, Yu. A.; Ivochkin, Yu. P.; Korol, E. Z.

doi:10.1023/b:hite.0000033889.01232.a5

Cited by 5 publications

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“…Zeigarnik et al [9] treated the thermomechanical mechanism of fine fragmentation of liquid droplets caused by significant temperature gradients in a hot droplet in the case of its contact with cold liquid and intense vaporization. In this case, the colder outer layers of the droplet tend to contract and are subjected to tension stresses; the hotter inner layers, on the contrary, are in the state of compression.…”

Section: Theoretical Estimates and Experimental Resultsmentioning

confidence: 99%

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A possible mechanism of triggering a vapor explosion

et al. 2006

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Relations are derived which enable one to assess the size of fragments of a liquid-metal droplet after its fragmentation formed in the case of instantaneous contact between a hot metal surface and a coolant. The obtained experimental data demonstrate that the amplitude of pressure pulses generated during vapor film collapse (second boiling crisis) is several times lower than the values required for triggering a spontaneous vapor explosion. The assumption is validated according to which progress in studying the process of triggering a spontaneous vapor explosion is associated primarily with advances in understanding the mechanism of fragmentation of individual droplet.

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Section: Theoretical Estimates and Experimental Resultsmentioning

confidence: 99%

“…Given in the inset is a packet of initial pressure pulses on an enlarged scale. GLAZKOV, GRIGOR'EV, ZHILIN et altic forces, the thermal Weber criterion was derived in[9], .…”

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A possible mechanism of triggering a vapor explosion

et al. 2006

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“…It may arise naturally after an impact of a melt jet or hot fragment against the container bottom or walls [10]. Further, a possibility exists of spontaneous emergence of a pressure pulse as a result of vapor film collapse on one or several hot fragments or of thermomechanical disintegration of liquid droplets [37].…”

Section: Pressure Pulse and Triggering Of Fine Fragmentation Of Hot Lmentioning

confidence: 99%

The behavior of a vapor film on a highly superheated surface immersed in subcooled water

et al. 2005

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Results are given of an experimental investigation of the behavior of a vapor film on a highly superheated hemispherical surface immersed in water subcooled to the saturation temperature. The conditions of existence of vapor films on a hot surface and the characteristics of their collapse from the heating surface and transition to nucleate boiling are revealed, as well as the effects which accompany the vanishing of vapor film. The possibilities of internal triggering of fine fragmentation of hot melt and vapor explosion are discussed.

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“…Further mechanisms evaporating like steam explosion [8,9], excluded consideration of the relatively low and constant level of heat flux density in the volume of the continuous medium liquid emulsion. In a first approximation, the number of bubbles n in each individual drop is considered equal to one, assuming the heat flux is insufficient for growth of other viable embryos vapor phase, which potentially also can grow under more favorable conditions.…”

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The growth of vapor bubbles in the volume of superheated drops, dispersed in high-boiling liquid

Rozentsvaig¹,

Strashinskii²

2014

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The growth of bubbles to the critical size, resulting in a volume of superheated droplets, which dispersed in high-boiling continuous medium liquid emulsion. Based on the first law of thermodynamics analysis of the formation of a new liquid-vapor interface surface and the nature of the phase transitions of the first kind in the closed medium, which is limited to the surface of the droplets of the dispersed phase. Shows the presence of factors associated with the size of the bubbles of vapor with a constant supply of heat through the interface. Presents the dependencies that fundamentally different from those describe boiling in unlimited volume fluid or near the surface of the heated wall.

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The Thermomechanical Mechanism of Fine Fragmentation of Liquid Droplets under Conditions of Vapor Explosion

Cited by 5 publications

References 0 publications

A possible mechanism of triggering a vapor explosion

A possible mechanism of triggering a vapor explosion

The behavior of a vapor film on a highly superheated surface immersed in subcooled water

The growth of vapor bubbles in the volume of superheated drops, dispersed in high-boiling liquid

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