Thermophysical properties of mixed oxide fuel and stainless steel type 316 for use in transition phase analysis

Chawla, T.C.; Graff, D.L.; Borg, R.C.; Bordner, G.L.; Weber, David P.; Miller, Dean J.

doi:10.1016/0029-5493(81)90155-2

Cited by 58 publications

(10 citation statements)

References 3 publications

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“…And Cr 2 O 3 is considered as the main oxide layer that forms on the surface . The thermal conductivity value for stainless steel type-316 has been found to be approximately 30 W/mK at 1300 K. , However, it is believed that repeated combustion experiments have led to changes in the thermal properties of the wall. As such, a smaller value of 25 W/mK has been assigned as the thermal conductivity of the wall while the thermal conductivity for the solid matrix is set to be 50 W/mK…”

Section: Methodsmentioning

confidence: 99%

Fundamental Experiment and Numerical Analysis of a Modular Microcombustor with Silicon Carbide Porous Medium

Chua

Yang

Ong

2012

Ind. Eng. Chem. Res.

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The use of porous media in combustion processes has been widely researched and investigated. In this paper, the effect of employing porous media on microcombustion was studied using numerical simulation. Simulated results demonstrated good agreement with the experimental results, and thus validated the model. Analysis has been carried out with dimensional analysis and basic theorem which incorporates the Biot number in an attempt to fundamentally understand the effects brought about by equivalence ratio, thermal conductivity of the solid matrix and mass flow rate on microthermophotovoltaic (TPV) performance. One of the key results has demonstrated that the higher the equivalence ratio of the fuel/air mixture, the higher will be the mean wall temperature. A peak-shift phenomenon has been observed, where the position of maximum flame temperature shifts downstream away from the inlet at lower equivalence ratio. Results from the Biot number analysis has indicated that the higher the thermal conductivity of the wall is, the more uniform the wall temperature distribution will be. A lower mean wall temperature is obtained when the thermal conductivity of the solid matrix is installed at 50 W/mK, whereas higher mean wall temperatures can be achieved for either small (5 W/mK) or very large (500 W/mK) thermal conductivity. It is clearly evidenced that the performance of microcombustors can be markedly enhanced by incorporating a thermally effective porous medium. The theoretical understanding gained from the present research will facilitate the design of more energy efficient, stable and better controllable portable TPV on-field power systems.

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Section: Methodsmentioning

confidence: 99%

Fundamental Experiment and Numerical Analysis of a Modular Microcombustor with Silicon Carbide Porous Medium

Chua

Yang

Ong

2012

Ind. Eng. Chem. Res.

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“…Here, we focus on their T1 experiment. The physical properties for the UO2 melt and liquid sodium were as follows [98]: ρj = 8 663 kg/m 3 , νj = 0.46 mm 2 /s, σ = 0.465 N/m, ρc = 856 kg/m 3 , and νc = 0.28 mm 2 /s. The dimensionless quantities, calculated using Eqs.…”

Section: Ft Experimentsmentioning

confidence: 99%

Color-gradient lattice Boltzmann model with nonorthogonal central moments: Hydrodynamic melt-jet breakup simulations

et al. 2018

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We develop a lattice Boltzmann (LB) model for immiscible two-phase flow simulations with central moments (CMs). This successfully combines a three-dimensional nonorthogonal CM-based LB scheme [De Rosis, Phys. Rev. E 95, 013310 (2017)2470-004510.1103/PhysRevE.95.013310] with our previous color-gradient LB model [Saito, Abe, and Koyama, Phys. Rev. E 96, 013317 (2017)2470-004510.1103/PhysRevE.96.013317]. Hydrodynamic melt-jet breakup simulations show that the proposed model is significantly more stable, even for flow with extremely high Reynolds numbers, up to O(10^{6}). This enables us to investigate the phenomena expected under actual reactor conditions.

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“…Note that the densities and viscosities of the continuous phases in Table 2 are of the same order as the actual conditions ( Table 1). Table 1 Physical properties of SFR conditions (Chawla et al, 1981;Golden and Tokar, 1967…”

Section: Manuscript For Nuclear Engineering and Designmentioning

confidence: 99%

Flow transition criteria of a liquid jet into a liquid pool

Saito

Abe

Koyama

2017

Nuclear Engineering and Design

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To better understand the fundamental interactions between melt jet and coolant during a coredisruptive accident at a sodium-cooled fast reactor, the jet breakup and droplet formation in immiscible liquid-liquid systems were studied experimentally. Experiments using two different pairs of test fluids were carried out at isothermal conditions. The observed jet breakup behavior was classified into characteristic regimes based on the classical Ohnesorge classification in liquid-gas systems. The variation in breakup length obtained in the present liquid-liquid system was similar to that in a liquidgas system. The droplet size distribution in each breakup regime was analyzed using image processing and droplet formation via pinch-off, satellite formation, and entrainment was observed. The measured droplet size was compared with those available from melt jet experiments. Based on the observation and analysis results, the breakup regimes were organized on a dimensionless operating diagram, with the derived correlations representing the criteria for regime boundaries of a liquid-liquid system. Finally, the experimental data were extrapolated to the expected conditions of a sodium-cooled fast reactor. From this, it was implied that most of the hydrodynamic conditions during an accident would be close to the atomization regime, in which entrainment is the dominant process for droplet formation. Nomenclature d droplet diameter Dj0 nozzle diameter

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Thermophysical properties of mixed oxide fuel and stainless steel type 316 for use in transition phase analysis

Cited by 58 publications

References 3 publications

Fundamental Experiment and Numerical Analysis of a Modular Microcombustor with Silicon Carbide Porous Medium

Fundamental Experiment and Numerical Analysis of a Modular Microcombustor with Silicon Carbide Porous Medium

Color-gradient lattice Boltzmann model with nonorthogonal central moments: Hydrodynamic melt-jet breakup simulations

Flow transition criteria of a liquid jet into a liquid pool

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