Direct steam condensation at sub-atmospheric pressure: experimental tests and similitude analysis

Pesetti, Alessio; Marini, Anna María; Giambartolomei, G.; Lazzeri, Roberta; Raucci, M.; Sarkar, B.; Olcese, M.; Aquaro, Donato

doi:10.1088/1742-6596/1868/1/012018

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…IV scenario in SLT of ITER VVPSS, was experimentally investigated in the SSTF. Based on about 400 tests [13][14] carried out in the SSTF, proper scaling laws were defined, already published [15] and here summarized. It was found out that condensation regime is mainly function of water pool temperature (TW), water pool pressure in front of the injection holes (PW, i.e., downstream pressure) and steam mass flux (GS, mass flow rate per unit of 38th UIT Heat Transfer International Conference (UIT 2021) hole area).…”

Section: Small Scale Test Facility and Scaling Lawsmentioning

confidence: 99%

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Experimental Analysis of Steam Condensation Heat Transfer Coefficient in Water Pool at Sub-Atmospheric Pressure

Pesetti

Merello

Giambartolomei

et al. 2022

J. Phys.: Conf. Ser.

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The experimental analysis of steam direct contact condensation in a water pool at sub-atmospheric condition was carried out in relevant configurations for the International Thermonuclear Experimental Reactor (ITER) Vacuum Vessel Pressure Suppression System, during a postulated Ingress of Coolant Event category IV accidental scenario. This transient accident was experimentally simulated in a reduced scale (1:22) facility at University of Pisa, adopting a defined scaling law. The steam jet plumes were video recorded and image analysis was performed at stable and interfacial oscillation condensation regimes, providing steam plume average length and interfacial area. The average heat transfer coefficient was therefore computed and correlated to the condensation driving potential. Also, the steam jet length divided by orifice diameter (L/D) was characterised as function of driving potential. Empirical correlations available in literature at atmospheric conditions were modified for evaluating vacuum conditions peculiarities. The remarkable higher dependence of heat transfer coefficient (HTC) to driving potential parameter, at vacuum conditions, was highlighted by the driving potential exponent equal to 1.2 instead of 0.04 at ambient pressure. The obtained L/D and HTCcorrelations are able to predict with ± 15% and ± 30% of error the corresponding experimental data, respectively.

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Section: Small Scale Test Facility and Scaling Lawsmentioning

confidence: 99%

“…This activity is part of an extensive experimental and numerical University of Pisa effort for supporting the ITER VVPSS design and verification [15]- [19] and for literature improvement about DCC at sub-atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Steam Condensation Heat Transfer Coefficient in Water Pool at Sub-Atmospheric Pressure

Pesetti

Merello

Giambartolomei

et al. 2022

J. Phys.: Conf. Ser.

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Entraining of dust and steam flux in water pool: experimental and numerical simulations of vapor condensation and dust deposition

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Pesetti

Raucci

et al. 2022

J. Phys.: Conf. Ser.

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This paper deals with experimental tests of steam condensation in a water pool at atmospheric pressure and temperature in the range 15-100 °C. The activity is performed in the frame of a research program, funded by the ITER organization, for the study of dust deposition, produced in the ITER Vacuum Vessel and entrained by the steam and non condensable gas into the Pressure Suppression Tanks in the case of a Loss of Coolant Accident. The steam condensation into a subcooled water pool has been investigated to characterise the condensation regimes occurring during dust deposition tests. The dust distribution on the tank walls strongly depends on the steam jet length and on the effective heat transfer coefficient. Few grams of dust reduce the water transparency, therefore separated tests without dust overcome this drawback. Measurements of the lengths and surfaces of the steam jets (which permit to calculate effective average heat transfer) have been performed by means of image analyses and have been compared with theoretical correlations. The comparison showed a good agreement between the experimental data and theoretical correlations. Useful data have been obtained for implementing numerical models of dust deposition and for understanding the dust distribution on the tank wall obtained in the experimental tests.

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Direct steam condensation at sub-atmospheric pressure: experimental tests and similitude analysis

Cited by 2 publications

References 3 publications

Experimental Analysis of Steam Condensation Heat Transfer Coefficient in Water Pool at Sub-Atmospheric Pressure

Experimental Analysis of Steam Condensation Heat Transfer Coefficient in Water Pool at Sub-Atmospheric Pressure

Entraining of dust and steam flux in water pool: experimental and numerical simulations of vapor condensation and dust deposition

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