The mechanism of violent condensation shocks

Class, G.; Raff, Samuel J.; Meyder, R.

doi:10.1016/0301-9322(87)90005-x

Cited by 13 publications

(1 citation statement)

References 4 publications

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“…Table 1 gives a summary of the previous experimental studies [6], [7], [8]. Pressure signals during chugging [9], [10], [11], [12], [13], [14], [15] and the effect of the direct contact condensation on the pool temperature stratification [16], [17] were studied. They described the phenomena through the definition of main parameters without explaining the physical mechanism.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on steam chugging phenomenon in a vertical sparger

Gregu

Takahashi

Pellegrini

et al. 2017

International Journal of Multiphase Flow

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Unstable direct contact condensation called ``Chugging'’ that occurs in certain conditions in the pressure suppression pool of Primary Containment Vessel of Boiling Water Reactors (BWRs) was studied experimentally. The mechanisms of every phase of the chugging was described, and experimental results useful for the development and validation of more accurate CFD models were provided. The experiment was conducted with a transparent pool and a transparent polycarbonate pipe or a stainless steel pipe with inner diameter of 27 mm under the conditions of the steam mass flux of 5.5–19.5 kg/m2s and the pool temperature of 19–46.5 °C. Pressure pulses were measured and synchronized with a high speed video camera for images acquisition. It was identified that the bubble implosion occurred while the pressure in the bubble quickly decreased. This condition might establish instability in the interfacial area which grew abruptly causing the implosion. Moreover the transparent apparatus allowed to interpret and relate internal condensations, generating pressure spikes of around 1.2 MPa because of the condensation-induced water hammer. Finally, the chugging condensation regime map was created from the experimental data

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