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Effective water cooling of very hot surfaces during the LOCA accident.
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SYSNO ASEP 0481374 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Effective water cooling of very hot surfaces during the LOCA accident. Tvůrce(i) Štepánek, J. (CZ)
Bláha, V. (CZ)
Dostál, V. (CZ)
Entler, Slavomír (UFP-V) ORCIDZdroj.dok. Fusion Engineering and Design. - : Elsevier - ISSN 0920-3796
Roč. 124, November (2017), s. 1211-1214Poč.str. 4 s. Forma vydání Tištěná - P Akce SOFT 2016: Symposium on Fusion Technology /29./ Datum konání 05.09.2016 - 09.09.2016 Místo konání Prague Země CZ - Česká republika Typ akce WRD Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova LOCA ; Quenching ; Divertor cooling ; Heat transfer ; Rewetting Vědní obor RIV JF - Jaderná energetika Obor OECD Nuclear related engineering Institucionální podpora UFP-V - RVO:61389021 UT WOS 000419411900252 EID SCOPUS 85016419521 DOI 10.1016/j.fusengdes.2017.03.150 Anotace The quench front propagation in the case of the water emergency cooling of water cooled fusion nuclear components is studied during the LOCA accident. In the case of the LOCA accident, heat removal can be successful only when water rewetts the surface. The place where water meets the very hot surface is called the quench front. The quench front propagation depends on the initial wall temperature, coolant flow rate, and heat accumulated in the cooled components. Results of the quench front experiment in an annular 1.7 m length channel with initial wall temperatures within the range from 250 degrees C up to 800 degrees C and coolant mass fluxes 100 kg/m(2) s and 180 kg/m(2) s are presented. From the results is concluded, that quenching velocities and rewetting temperatures are strongly dependent on the initial wall temperature as well as the pressure spikes. The behaviour of the heat transfer coefficient at the quench front is analyzed.
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