An advanced evaluation of spouted beds scale-up for coating TRISO nuclear fuel particles using Radioactive Particle Tracking (RPT)

Ali, Neven; Al-Juwaya, Thaar; Al‐Dahhan, Muthanna H.

doi:10.1016/j.expthermflusci.2016.08.002

Cited by 36 publications

(22 citation statements)

References 33 publications

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“…In our laboratory, the mentioned assessment has been achieved using advanced non-invasive techniques: Gamma ray computed tomography (CT) and Radioactive particles tracking (RPT) techniques. With these techniques, we were able to address important issues related to the scale up of spouted beds [40,41]. It has been proven through practical experimentation and research studies, that CT and RPT are the most promising technologies for visualizing multi-phase flow systems (i.e.…”

Section: Introductionmentioning

confidence: 99%

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Al-Juwaya

Ali

Al‐Dahhan

2017

Experimental Thermal and Fluid Science

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The successful operation and safety of the Very-High-Temperature Nuclear Reactors (VHTR) extremely depend on the quality of the TRISO nuclear fuel coated particles. Hence, the fuel coating technology of TRISO particles, based on chemical vapour deposition (CVD) process, performed in gas-solid spouted beds, is of utmost importance. However, the deposition of the coating layers surrounding the kernel is a delicate process, and impacted by the hydrodynamics of spouted beds. Therefore, in this work, we have applied an advanced non-invasive gamma-ray computed tomography (CT) technique for the first time to investigate the hydrodynamics of spouted beds. In particular, we study the effect of particle density, particle size, bed size, and superficial gas velocity on the gas-solid cross-sectional distributions of spouted beds. The color distributions of the cross-sectional images clearly identified the three regions of spouted beds: the spout, the annulus, and the fountain regions. Interesting results and findings are presented, discussed and analyzed in the article. For example, the results demonstrated that the summation that operating spouted beds at stable spouting state would lead to achieving uniform coating layers of the particles in the TRISO fuel coating process is not adequate. Further, it has been found that increasing the superficial gas velocity much higher above the minimum spouting velocity increases the gas holdup in the annulus above the gas holdup value at the loss-packed bed state, contrary to common assumptions presented in the literature. This study represents an original experimental investigation required both for advancing the understanding of TRISO particles spouted bed and providing benchmark data to validate computational fluid dynamics (CFD).

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Section: Introductionmentioning

confidence: 99%

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Al-Juwaya

Ali

Al‐Dahhan

2017

Experimental Thermal and Fluid Science

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“…As an evaluation of this approach, the scale-up methodology was carried out using sophisticated optical fibre probes that measured simultaneously the local velocity of solids, normal and shear stresses and turbulent kinetic energy [200]. The study evidenced the need of local measurements of hydrodynamic parameters for the correct scale up procedures.…”

Section: Conicalmentioning

confidence: 99%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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The development of robust mathematical models could provide the necessary tools for a more rapid, efficient, and reliable spouted bed technology development. Computer simulations can be very useful to aid this design and scale-up process: firstly, they can contribute to obtain a fundamental insight into their complex dynamic behavior by understanding the elementary physical principles such as drag, friction, dissipation etc.; secondly, the simulations can be used as a design tool where the ultimate goal is to have a numerical model with predictive capabilities for gas-particle flows at engineering scale. Clearly, one single simulation method will not be able to achieve this goal, but a hierarchy of methods modelling phenomena on different length and time scales can achieve this. The most fruitful approach will be when they are simultaneously followed, so that they can mutually benefit from each other. In this sense, this paper presents a review of the current state of the art of modelling on spouted and spout-fluid beds through an analysis of recent literature following a multiscale approach (molecular and particle, lab, plant and industrial scale). The main features of the different scales together with their current limits are discussed and specific topics are highlighted as paths that still need to be explored. In summary, the paper aims to define the theoretical setline and the basis of improvement that would lead to a robust multiscale model with solid links between micro and macroscopic phenomena. If done with the correct balance between accuracy and computational costs it will gear SB towards their reliable and successful implementation.

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“…Reduced-scale tests are often based on a dynamic similarity criterion, and to define the experiemnts, dimensionless groups can be used [23] [24]. Dynamic similarity is achieved when the dimensionless groups provide the same numerical results for the different scales.…”

Section: Test Scaling Approach and Thermal Similaritymentioning

confidence: 99%

Application of reduced scale tests to improve the thermal performance of high-voltage substation connectors

Abomailek

Riba

Torrens

2018

Experimental Heat Transfer

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The thermal behavior of high-voltage substation connectors is a critical aspect that must be considered during the design stage. Most research about the thermal performance of substation connector devices is based on full scale models. This paper proposes a downscaling method to evaluate the thermal performance of reduced scale substation connectors. The theoretical results attained in this paper were validated by means of FEM simulations and experimental tests. Reduced scale simulation and testing will be an essential tool for assessing the thermal performance of substation connectors and other electrical equipment during the design and validation stages.

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An advanced evaluation of spouted beds scale-up for coating TRISO nuclear fuel particles using Radioactive Particle Tracking (RPT)

Cited by 36 publications

References 33 publications

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Application of reduced scale tests to improve the thermal performance of high-voltage substation connectors

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