Research Papers

Thermal Hydraulic Modeling and Analysis of Fusion Reactors Plasma Facing Components Using Alumina Nanofluids

[+] Author and Article Information
Filippo Genco

Mechanical and Industrial Engineering Department,
Alhosn University,
P.O. Box 38772,
Abu Dhabi, UAE

Giacinto Genco

Preparatory Science
and Engineering Program (PSEP),
King Fahd University of
Petroleum and Minerals,
P.O. Box 5026,
Dhahran, KSA

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 21, 2016; final manuscript received September 14, 2016; published online March 21, 2017. Assoc. Editor: Ziad Saghir.

J. Thermal Sci. Eng. Appl 9(3), 031003 (Mar 21, 2017) (9 pages) Paper No: TSEA-16-1136; doi: 10.1115/1.4035924 History: Received May 21, 2016; Revised September 14, 2016

Damage to plasma facing components (PFC) due to high intense energy deposition during tokamak plasma instabilities is still considered one of the most serious and unresolved problem for the fusion reactors. Key plasma facing components as the divertor and the entire first wall during off-normal operations are generally subjected to high rate of deposition of energy, neutrons, and radiation leading generally to structural catastrophic failures including burnout of coolant tubes. The use of alumina nanofluids applied to future fusion reactors is proposed to, at least, mitigate some of the problems described providing better thermal performance during off-normal events. A 1D heat transfer model using the characteristics of alumina nanoparticles dispersed in common water is presented. Heat transfer of alumina nanofluid is modeled. Results obtained are critically compared with other well-known computer packages and experiments used to predict the coolant heat removal capabilities during longer quasi-steady state plasma instabilities events. Enhancements produced by the use of alumina nanoparticles are evident. Comparisons with both pure water and swirl tape inserts are carried out and critical heat flux (CHF) conditions are predicted showing good agreement with both published numerical and experimental data.

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Fig. 1

Flow model for uniform one-sided heat flux to coolant

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Fig. 2

Simulation comparison of wall heat response with varied plasma flux

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Fig. 3

Predicted and experimentally measured wall temperature for plain tube with pure water

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Fig. 4

Predicted and experimentally measured wall temperature for swirl tape inserts Y = 2

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Fig. 5

Variation of the ONB point along the tube for different heat fluxes

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Fig. 6

Variation of the ONB point along the tube for different heat fluxes (water only)

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Fig. 7

Simulation of wall heat response with varied plasma flux (water versus alumina nanofluid)

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Fig. 8

Simulation of CHF enhancement with alumina nanofluid and pure water into tube with swirl tape inserts




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