0000000000354160

AUTHOR

Zhang K.

showing 2 related works from this author

Divertor of the European DEMO: Engineering and technologies for power exhaust

2022

International audience; In a power plant scale fusion reactor, a huge amount of thermal power produced by the fusion reaction and external heating must be exhausted through the narrow area of the divertor targets. The targets must withstand the intense bombardment of the diverted particles where high heat fluxes are generated and erosion takes place on the surface. A considerable amount of volumetric nuclear heating power must also be exhausted. To cope with such an unprecedented power exhaust challenge, a highly efficient cooling capacity is required. Furthermore, the divertor must fulfill other critical functions such as nuclear shielding and channeling (and compression) of exhaust gas fo…

Technology020209 energyMechanical EngineeringPower exhaust02 engineering and technologyDEMO; Fusion reactor; Divertor; Plasma-facing component; High-heat-flux; Power exhaust01 natural sciences7. Clean energy010305 fluids & plasmas[SPI]Engineering Sciences [physics]Fusion reactorDivertorDEMO; Divertor; Fusion reactor; High-heat-flux; Plasma-facing component; Power exhaustNuclear Energy and Engineering0103 physical sciences0202 electrical engineering electronic engineering information engineeringPlasma-facing componentGeneral Materials ScienceHigh-heat-fluxddc:600DEMOSettore ING-IND/19 - Impianti NucleariCivil and Structural EngineeringFusion Engineering and Design
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Overland flow hydrodynamic characteristics in rough beds at low Reynolds numbers

2022

This paper considers overland flow resistance at low Reynolds numbers through analysis of experimental runs carried out using water only and water/glycerol mixtures. We first examined the power relationship between the Darcy–Weisbach friction factor f and the Reynolds number Re to obtain the values of the K coefficient and b exponent. These results confirmed the applicability of the values of b suggested in literature, while K required a specific calibration for laminar open-channel flows. The analysis revealed that transition from a laminar to turbulent flow regime for water only flows occurred at a threshold value of Re equal to 500 as described historically. The estimate of f by the powe…

Bed roughneSelf-similarityDimensional analysiMixed flowFlow resistanceVelocity profileSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliWater Science and TechnologyJournal of Hydrology
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