Numerical simulation of heat transfer in packed pebble beds: CFD-DEM coupled with particle thermal radiation

Hao, W.; Gui, Nan; Yang, Xingtuan; Tu, Jiyuan; Jiang, Shengyao

doi:10.1016/j.ijheatmasstransfer.2017.03.035

Cited by 145 publications

(21 citation statements)

References 36 publications

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“… Fundamentals of radiation modeling in the pebble beds. Our group has also proposed a series of numerical radiative models, including the short range model, long range model, microscopic model, the sub-cell model, semi-empirical model, and smoothed void fraction method, coupled with CFD-DEM simulation framework to study the effective thermal conductivity coefficient of the packed pebble bed (Wu et al, 2016(Wu et al, , 2017(Wu et al, , 2018a(Wu et al, , 2018b(Wu et al, , 2018c.…”

mentioning

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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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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“…Besides, particle motion follows Newton's second law, and its governing equations consist of translational and rotational parts. The equation of motion is as follows (Wu, Gui, Yang, Tu, & Jiang, 2017)…”

Section: Equations Governing Particle Phasementioning

confidence: 99%

Investigating the filtration behavior of metal fiber felt using CFD-DEM simulation

Liu

Ding

Chen

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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This paper studies the dynamic filtration behavior of coal particles in metal fiber felt, by developing a three-dimensional model based on microstructure and arrangement mode of metal fiber felt identified by scanning electron microscope. Discrete element method (DEM) is coupled with Computational fluid dynamics (CFD) to simulate filtration of coal particles in metal fiber felt. The simulation mainly studies the moving trail and deposition characteristics of spherical coal particles. The results demonstrated that coal particles can bypass the metal fibers and enter the inside of the metal fiber felt through mesh channels. The moving trail of coal particles is similar to a broken line. It is also shown that most coal particles are trapped due to the deep filtration of metal fiber felt and the distribution pattern of them is inhomogeneous. The number of particles trapped by metal fiber felt is reduced in the direction of thickness. It is found that coal particles can be trapped not only by randomly arranged metal fibers, but also by coal particles deposited previously. Finally, the kinetic energy loss of coal particles mainly occurs in the initial stage when particles pass through metal fiber felt. And the velocity of coal particles inside metal fiber felt is maintained at 0.15-0.25 m/s. Highlights • A more realistic three-dimensional model was reconstructed according to scanning electron microscope pictures. • The particle trajectory, deposition mode of particle groups and speed change of particles were investigated using CFD-DEM in the paper. • The simulation method was validated by the experiment.

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“…The core of high temperature gas-cooled nuclear reactor (HTGR) (Zhang et al, 2016;Wu et al, 2017), which is an adobe type of Gen IV, is a dense pebble system with gas-particle two-phase flow and heat transfer. Under norm and accidental operation conditions, the heat transportation is driven by forced convection and thermal radiation (Latifi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…A particle scale approach called short-range radiation model (SRM) is developed in our previous work (Wu et al, 2016b), in which adjacent Voronoi pairs are considered for flux. In Wu et al (2017), SRM is coupled in the CFD-DEM simulation for the flow and heat transfer of nuclear pebble bed. It is shown that the power of the fan will increase significantly when the nuclear reactor is above full power.…”

Section: Introductionmentioning

confidence: 99%

Parameter analysis and wall effect of radiative heat transfer for CFD-DEM simulation in nuclear packed pebble bed

Hao

Gui

Yang

et al. 2020

Exp. Comput. Multiph. Flow

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In the heat transportation of core of high temperature gas-cooled nuclear reactor (HTGR), radiative heat transfer plays a significant role in the CFD-DEM simulations. The numerical investigation is conducted for parameter analysis and wall effect of the thermal radiation. A cell model is presented to discuss the effects of temperature and pebble size. The radiation effective conductivity is directly proportional to pebble diameter and cube of the temperature. For engineering cases, the emissivity on radiation is linear approximately. In the bulk region without wall effect, the radiative thermal conductivity is inversely proportional to the packing density. The effect of solid conductivity and gas absorption can be neglected for common gases with forced convection. With uniform continuum model and discrete particle simulation, the radiative conductivity is inversely proportional to the pebble sphericity and directly proportional to the integral of the radial distribution and radiation interaction function. And radiation characteristics in wall and near-wall region are different from that of bulk region.

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Numerical simulation of heat transfer in packed pebble beds: CFD-DEM coupled with particle thermal radiation

Cited by 145 publications

References 36 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

Investigating the filtration behavior of metal fiber felt using CFD-DEM simulation

Parameter analysis and wall effect of radiative heat transfer for CFD-DEM simulation in nuclear packed pebble bed

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