Filtered models for scalar transport in gas–particle flows

Agrawal, Kapil; Holloway, William; Milioli, Christian C.; Milioli, Fernando Eduardo; Sundaresan, Sankaran

doi:10.1016/j.ces.2013.03.017

Cited by 70 publications

(69 citation statements)

References 23 publications

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“…The species dispersion due to the filtered microscopic diffusion (the first term on the right-hand side) was expected to be small relative to meso-scale dispersion, as well as convective transport. Therefore, in line with previous work regarding scalar dispersion in fTFMs [31], it was simply evaluated as ∇ • ρ g Dα g ∇ X A in the present study. The subgrid species dispersion rate (the second term on the right-hand side) tends to disperse the species due to sub-grid velocities arising from unresolved gas bubbles and solids clusters.…”

Section: Of 29mentioning

confidence: 93%

“…Most studies have investigated the influence of subgrid effects on the effective reaction rate of first-order solids-catalyzed reactions [28][29][30], where mass-transfer limitations imposed by the bubbles and clusters drastically reduce the effective reaction rates. Closures are also required for the dispersion of scalars (such as species and enthalpy) due to subgrid velocity fluctuations and for the effective interphase heat transfer rate [31,32]. The present study aimed to demonstrate how multiscale CFD simulations can be used to assist the evaluation of novel reactor concepts on an industrial scale, focusing on an internally circulating fluidized bed reactor for power production with CO2 capture.…”

Section: Methodsmentioning

confidence: 99%

“…The subgrid species dispersion rate (the second term on the right-hand side) tends to disperse the species due to sub-grid velocities arising from unresolved gas bubbles and solids clusters. This effect was accounted for using the closures of Agrawal et al [31] but has been shown to only have a minor effect on the overall reaction rate [28]. The filtered reaction rate (third term on the right-hand side) is typically substantially reduced by subgrid bubbles and clusters and is essential to model [28].…”

Section: Of 29mentioning

confidence: 99%

“…Here, as with the species diffusion, the filtered microscopic conductivity (first term on the right-hand side) is small compared to the enthalpy dispersion from sub-grid velocity fluctuations and is simply approximated as κ g α g ∇ T g . The subgrid enthalpy dispersion rate (second term on the right-hand side) and the filtered heat transfer rate (third term on the right-hand side) were modeled using the closures of Agrawal et al [31]. The physical behavior of these contributions is analogous to that of the species dispersion rate and filtered reaction rate, due to the similarity of mass and heat transfer.…”

Section: Of 29mentioning

confidence: 99%

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Simulation-Based Design and Economic Evaluation of a Novel Internally Circulating Fluidized Bed Reactor for Power Production with Integrated CO2 Capture

et al. 2019

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Limiting global temperature rise to well below 2 °C according to the Paris climate accord will require accelerated development, scale-up, and commercialization of innovative and environmentally friendly reactor concepts. Simulation-based design can play a central role in achieving this goal by decreasing the number of costly and time-consuming experimental scale-up steps. To illustrate this approach, a multiscale computational fluid dynamics (CFD) approach was utilized in this study to simulate a novel internally circulating fluidized bed reactor (ICR) for power production with integrated CO2 capture on an industrial scale. These simulations were made computationally feasible by using closures in a filtered two-fluid model (fTFM) to model the effects of important subgrid multiphase structures. The CFD simulations provided valuable insight regarding ICR behavior, predicting that CO2 capture efficiencies and purities above 95% can be achieved, and proposing a reasonable reactor size. The results from the reactor simulations were then used as input for an economic evaluation of an ICR-based natural gas combined cycle power plant. The economic performance results showed that the ICR plant can achieve a CO2 avoidance cost as low as $58/ton. Future work will investigate additional firing after the ICR to reach the high inlet temperatures of modern gas turbines.

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Section: Of 29mentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Section: Of 29mentioning

confidence: 99%

Section: Of 29mentioning

confidence: 99%

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Simulation-Based Design and Economic Evaluation of a Novel Internally Circulating Fluidized Bed Reactor for Power Production with Integrated CO2 Capture

et al. 2019

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“…In [30] author recognized five contending systems for horizontal relocation of a roundabout particle with thermal convection, in particular, the divider aversion because of grease, the inertial lift identified with sheer slip, the lift on account of particle insurgency, the lift in light of the twist of the regular velocity form also, the journey influenced by thermal convection. Some different scientists have additionally given an account of the numerical investigation of thermal convective particulate flows [31]- [39].…”

Section: Related Workmentioning

confidence: 99%

Efficient FEM FBM for Simulation of Elliptic Particle Sedimentation with Thermal Convection

Verma,

Suhas

2020

IJEAT

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The dynamic sedimentation of large particles including thermal convection gained the significant attentions in various applications using the Direct Numeral Solution (DNS) methods. The current solutions are mainly focused on isothermal suspended particles without the thermal convection separating dissolved particles and enveloping fluids. The systems beside thermal convection having the lack of sufficient investigations like missing the hot and cold elliptic particle in infinity long channels. In this work, we work on two challenges efficient DSN method designing and simulation of elliptic particle in infinity long channel using proposed DNS. The novel approach presented to study and simulates dynamic behaviour of elliptic particle sedimentation using the different settling modes using the Swarm Intelligent (SI) construct Finite Element Fictitious Boundary Method (FEM-FBM) and validates outcomes effectively. The Particle Swarm Optimization (PSO) used as SI to improve the accuracy and efficiency of FEM-FBM model in this work. The PSO based multi-grid FEM-FBM called PFEM-FBM proposed as Direct Numerical Solution (DNS) to simulate and validate fluid flows with thermal convection. The PFEM-FBM method used to understand the progression, energy, and warmth conditions effectively. The re-enactments utilizing PFEM-FBM led to utilizing the three diverse experiments. In the principal case, the relative investigation of cold, hot, and isothermal elliptic particles with thermal convection introduced. In the resulting situation, the estimation of cold elliptic particle improving in an incomprehensibly long channel with its endorsement presented. In the third case, the examination of hot elliptic particle resolve in an incessantly large channel with its support presented. The completion of the study is validated using the simulation outcomes with recent technique at the end.

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Innovative Computational Tools and Models for the Design, Optimization and Control of Carbon Capture Processes

Miller¹

2017

Process Systems and Materials for CO2 Capture

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Filtered models for scalar transport in gas–particle flows

Cited by 70 publications

References 23 publications

Simulation-Based Design and Economic Evaluation of a Novel Internally Circulating Fluidized Bed Reactor for Power Production with Integrated CO2 Capture

Simulation-Based Design and Economic Evaluation of a Novel Internally Circulating Fluidized Bed Reactor for Power Production with Integrated CO2 Capture

Efficient FEM FBM for Simulation of Elliptic Particle Sedimentation with Thermal Convection

Innovative Computational Tools and Models for the Design, Optimization and Control of Carbon Capture Processes

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