Accelerated heat transfer simulations using coupled DEM and CFD

Sousani, Marina; Hobbs, Andrew M.; Anderson, A.; Wood, R.

doi:10.1016/j.powtec.2019.08.095

Cited by 40 publications

(8 citation statements)

References 29 publications

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“…Currently, the CFD-DEM method has been employed to investigate the heat transfer in different processes involving multiphase flow, especially for the gas-solid fluidized beds [24][25][26][27][28][29]. Patil et al [24] adopted an Euler-Lagrange method to study heat transfers in a fluidized bed and the numerical results are in good agreement to those of the experiments.…”

Section: Introductionmentioning

confidence: 91%

Heat Transfer and Hydrodynamics in Stirred Tanks with Liquid-Solid Flow Studied by CFD–DEM Method

Luo

Wang

et al. 2021

Processes

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The heat transfer and hydrodynamics of particle flows in stirred tanks are investigated numerically in this paper by using a coupled CFD–DEM method combined with a standard k-e turbulence model. Particle–fluid and particle–particle interactions, and heat transfer processes are considered in this model. The numerical method is validated by comparing the calculated results of our model to experimental results of the thermal convection of gas-particle flows in a fluidized bed published in the literature. This coupling model of computational fluid dynamics and discrete element (CFD–DEM) method, which could calculate the particle behaviors and individual particle temperature clearly, has been applied for the first time to the study of liquid-solid flows in stirred tanks with convective heat transfers. This paper reports the effect of particles on the temperature field in stirred tanks. The effects on the multiphase flow convective heat transfer of stirred tanks without and with baffles as well as various heights from the bottom are investigated. Temperature range of the multiphase flow is from 340K to 350K. The height of the blade is varied from about one-sixth to one-third of the overall height of the stirred tank. The numerical results show that decreasing the blade height and equipping baffles could enhance the heat transfer of the stirred tank. The calculated temperature field that takes into account the effects of particles are more instructive for the actual processes involving solid phases. This paper provides an effective method and is helpful for readers who have interests in the multiphase flows involving heat transfers in complex systems.

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Section: Introductionmentioning

confidence: 91%

Heat Transfer and Hydrodynamics in Stirred Tanks with Liquid-Solid Flow Studied by CFD–DEM Method

Luo

Wang

et al. 2021

Processes

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“…The DEM is used to track the trajectory and rotation of each particle in the system through a time-stepped simulation. The motion of the mass is governed by Newton's second law of motion, and the equations of motion for translational and rotational motion are as follows [23]:…”

Section: Governing Equations For Solid Phasementioning

confidence: 99%

“…θ is the corner acceleration. The equation used to calculate the force of different particle-particle interactions is as follows [23][24][25][26]:…”

Section: Governing Equations For Solid Phasementioning

confidence: 99%

“…Each phase satisfies the laws of the conservation of mass and conservation of momentum. The mass and momentum conservation equations for the fluid phase g are as follows [23]:…”

Section: Governing Equations For Gas Phasementioning

confidence: 99%

“…Numerical methods focusing on particle-fluid thermal convection, coating fluid ejection, and evaporation of the ejected fluid on the particle surface were investigated. M. Sousani et al [23] proposed an accelerated heat and mass transfer simulation using graphics processing unit (GPU) technology. The coupled model accurately captured the fluid-to-solid phase convective heat transfer process with a significant improvement in the simulation time.…”

Section: Introductionmentioning

confidence: 99%

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Design and Optimization of a Mixed-Flow Drying Chamber for Tiger Nuts Based on CFD-DEM Heat and Mass Transfer Model

Ding,

Dou,

et al. 2024

Agriculture

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In order to solve the problem of inconsistent moisture content in particles during the drying process of tiger nuts (Cyperus esculentus) due to uneven air flow and temperature distribution in the drying chamber, an open-hole corner box was designed based on the principle of negative pressure micro-perforated air supply. Using computational fluid dynamics (CFD) and discrete element method (DEM) simulation, coupled with the basic theory of interphase heat and mass transfer, a mathematical model for interphase heat and moisture coupling transfer was established. The effects of different aperture rates of corner boxes in the drying chamber, spatial location arrangement, and other related variables on the airfield distribution, temperature field distribution, tiger nut temperature, and moisture content changes were investigated. The results show that the average air velocity below the air inlet gradually increases as the opening ratio increases. When the opening rate is 0.33%, the wind field uniformity is better, and the inhomogeneity of the drying chamber wind field is improved. As the lateral distance increases, the consistency of the moisture content distribution increases and then decreases, and the flow rate of the tiger nuts gradually increases when the grain is discharged. The rate of decrease in water content decreases gradually with the increase in longitudinal distance. When the wind speed reaches 4 m/s, the drying chamber wind field is more uniform, and the water vapor diffusion efficiency at the outlet is basically the same. Therefore, the appropriate corner box has a horizontal distance of 320 mm and a longitudinal distance of 420 mm, providing a basis for the design of tiger nut drying equipment.

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State of the Art of Coupled Thermo–hydro-Mechanical–Chemical Modelling for Frozen Soils

Li,

Yin

2024

Arch Computat Methods Eng

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Numerous studies have investigated the coupled multi-field processes in frozen soils, focusing on the variation in frozen soils and addressing the influences of climate change, hydrological processes, and ecosystems in cold regions. The investigation of coupled multi-physics field processes in frozen soils has emerged as a prominent research area, leading to significant advancements in coupling models and simulation solvers. However, substantial differences remain among various coupled models due to the insufficient observations and in-depth understanding of multi-field coupling processes. Therefore, this study comprehensively reviews the latest research process on multi-field models and numerical simulation methods, including thermo-hydraulic (TH) coupling, thermo-mechanical (TM) coupling, hydro-mechanical (HM) coupling, thermo–hydro-mechanical (THM) coupling, thermo–hydro-chemical (THC) coupling and thermo–hydro-mechanical–chemical (THMC) coupling. Furthermore, the primary simulation methods are summarised, including the continuum mechanics method, discrete or discontinuous mechanics method, and simulators specifically designed for heat and mass transfer modelling. Finally, this study outlines critical findings and proposes future research directions on multi-physical field modelling of frozen soils. This study provides the theoretical basis for in-depth mechanism analyses and practical engineering applications, contributing to the advancement of understanding and management of frozen soils.

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Accelerated heat transfer simulations using coupled DEM and CFD

Cited by 40 publications

References 29 publications

Heat Transfer and Hydrodynamics in Stirred Tanks with Liquid-Solid Flow Studied by CFD–DEM Method

Heat Transfer and Hydrodynamics in Stirred Tanks with Liquid-Solid Flow Studied by CFD–DEM Method

Design and Optimization of a Mixed-Flow Drying Chamber for Tiger Nuts Based on CFD-DEM Heat and Mass Transfer Model

State of the Art of Coupled Thermo–hydro-Mechanical–Chemical Modelling for Frozen Soils

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