Pool boiling CHF enhancement by graphene-oxide nanofluid under nuclear coolant chemical environments
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- Pool boiling CHF enhancement by graphene-oxide nanofluid under nuclear coolant chemical environments
- Park, Seong Dae; Lee, Seung Won; Kang, Sarah; Kim, Seong Man; Bang, In Cheol
- APR1400; Boric acids; Chemical conditions; Chemical environment; CHF enhancement; Decay heat removal; Dispersion stability; Experimental studies; External reactor vessel cooling; High-power; In-vessel retention; Lithium hydroxide; Mitigation strategy; Nanofluids; Pool boiling; Pure water; Reactor cavity; Reactor vessel; Severe accident; Severe accident management
- Issue Date
- ELSEVIER SCIENCE SA
- NUCLEAR ENGINEERING AND DESIGN, v.252, no., pp.184 - 191
- External reactor vessel cooling (ERVC) for in-vessel retention (IVR) of corium as a key severe accident management strategy can be achieved by flooding the reactor cavity during a severe accident. In this accident mitigation strategy, the decay heat removal capability depends on whether the imposed heat flux exceeds critical heat flux (CHF). To provide sufficient cooling for high-power reactors such as APR1400, there have been some R&D efforts to use the reactor vessel with micro-porous coating and nanofluids boiling-induced coating. In present study, an experimental study has been conducted to investigate the viability of using graphene-oxide nanofluid under various coolant chemical environments to enhance CHF during ERVC. Pool boiling CHF experiments were carried out for the thin-wire heater with controlling the heater orientation from horizontal to vertical, or at 0 < theta < 90 degrees. The dispersion stability of graphene-oxide nanofluid in the chemical conditions of flooding water that includes boric acid, lithium hydroxide (DOH), and tri-sodium phosphate (TSP) was checked in terms of surface charge or zeta potential before the CHF experiments. Finally integral effects of graphene-oxide nanosheets and chemicals on CHF limits were investigated. Results showed that graphene-oxide nanofluids were very stable under ERVC coolant chemical environments and enhanced CHF limits up to about 40% at minimum at 90 degrees of angle (vertical orientation) and about 200% at maximum at 0 degrees of angle (horizontal orientation) in comparison to pure water.
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