Mechanical characterization of Li2TiO3 and Li4SiO4 pebble beds: Experimental determination of the material properties and of the pebble bed effective values

Zaccari, N.; Aquaro, Donato

doi:10.1016/j.fusengdes.2007.05.008

Cited by 41 publications

(5 citation statements)

References 7 publications

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“…For example, the compression force and gas pressure were tested (Tehranian and Abdou, 1995), along with the thermal conductivity at different values of temperature (Lo Frano et al, 2014). The strain and stress analysis by finite element method, as well as their effects on the thermal hydraulics were also checked, although the coupled effects were sometimes not found (Zaccari and Aquaro, 2007). Moreover, the effective thermal conductivity was found not to be influenced by the chemical composition of solid material whereas it can be affected by filling gas such as helium clearly (Pupeschi et al, 2017).…”

Section: Pebble Flowmentioning

confidence: 99%

A review of pebble flow study for pebble bed high temperature gas-cooled reactor

Jiang

Yang

et al. 2019

Exp. Comput. Multiph. Flow

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The pebble bed high temperature gas-cooled reactor is a promising generation-IV reactor, which uses large fuel pebbles and helium gas as coolant. The pebble bed flow is a fundamental issue for both academic investigation and engineering application, e.g., reactor core design and safety analysis. This work performed a review of recent progress on pebble flow study, focusing on the important issues like pebble flow, gas phase hydrodynamics, and inter-phase heat transfer (thermal hydraulics). Our group's researches on pebble flow have also been reviewed through the aspects of phenomenological observation and measurement, voidage distribution, geometric and parameter optimization, pebble flow mechanisms, flow regime categorization, and fundamentals of modelings of pebble flow and radiation. Finally, the major problems or possible directions of research are concluded which would be some of our focuses on the pebble bed flow study.

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Section: Pebble Flowmentioning

confidence: 99%

A review of pebble flow study for pebble bed high temperature gas-cooled reactor

Jiang

Yang

et al. 2019

Exp. Comput. Multiph. Flow

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“…The pebble bed temperature gradient is controlled by two external helium-cooled plates and provided with square cooling channels. The operating conditions of coolant are: helium at nominal flow rate of 8 g/s, inlet pressure of 1.5 MPa and inlet temperature of 250 • C. Inside the pebble bed a helium flow rate (purge gas) was regulated at 0.002 g/s (witch means to have velocity inside the bed lower than 0.01 m/s); the inlet pressure is equal to 0.05-0.1 MPa and the inlet temperature 50 • C [6][7][8][9].…”

Section: Geometry and Test Conditions Of Helica Mock Upmentioning

confidence: 99%

Thermal transient and the temperature profile in a HELICA mock-up simulated by a new finite element homogenous model

Zaccari

Aquaro

2013

Fusion Engineering and Design

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“…In addition, in numerous previous investigations, most of the attention was focused on the study of the macro-and meso-scale packing structure and contact force distribution of the mono-sized pebble bed [45][46][47][48][49][50][51]. Such as, the average porosity and radial porosity distribution in the mono-sized cylindrical pebble bed various as the increase of the diameter ratio of cylinder to pebble, and the relation between the coordination number and the porosity in bed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pebble Size Distribution and Wall Effect on Inner Packing Structure and Contact Force Distribution in Tritium Breeder Pebble Bed

et al. 2021

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In the tritium breeding blanket of nuclear fusion reactors, the heat transfer behavior and thermal-mechanical response of the tritium breeder pebble bed are affected by the inner packing structure, which is crucial for the design and optimization of a reliable pebble bed in tritium breeding blanket. Thus, the effect of pebble size distribution and fixed wall effect on packing structure and contact force in the poly-disperse pebble bed were investigated by numerical simulation. The results show that pebble size distribution has a significant influence on the inner packing structure of pebble bed. With the increase of the dispersion of pebble size, the average porosity and the average coordination number of the poly-disperse pebble bed gradually decrease. Due to the influence of the fixed wall, the porosity distribution of the pebble bed shows an obvious wall effect. For poly-disperse pebble bed, the influenced region of the wall effect gradually decreases with the increase of the dispersion of pebble size. In addition, the gravity effect and the pebble size distribution have an obvious influence on the contact force distribution inside the poly-disperse pebble bed. The majority of the contact force are weak contact force that is less than the average contact force. Only a few of pebbles have strong contact force that is greater than average contact force. This investigation can help in analyzing the pebble crushing characteristics and the thermal hydraulic analysis in the poly-disperse tritium breeder pebble bed.

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Mechanical characterization of Li2TiO3 and Li4SiO4 pebble beds: Experimental determination of the material properties and of the pebble bed effective values

Cited by 41 publications

References 7 publications

A review of pebble flow study for pebble bed high temperature gas-cooled reactor

A review of pebble flow study for pebble bed high temperature gas-cooled reactor

Thermal transient and the temperature profile in a HELICA mock-up simulated by a new finite element homogenous model

Effect of Pebble Size Distribution and Wall Effect on Inner Packing Structure and Contact Force Distribution in Tritium Breeder Pebble Bed

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