Influence of gas and solid phase thermo-physical and transport properties on the thermo-chemical conversion of char in reacting media: intra-particle, microscopic and temporal mass loss-based sensitivity analysis

Asheruddin, N. Mohammed; Shivapuji, Anand M.; Dasappa, S.

doi:10.1080/13647830.2021.1925349

Cited by 6 publications

(6 citation statements)

References 50 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model employs mass, species, and energy conservation, along with supplementary initial, boundary, and interface conditions, detailed interintraparticle transport, and chemical kinetics. The detailed model along with its sensitivity analysis to the thermodynamic and transport properties is presented in ref , and the fundamental concepts of the model are presented here.…”

Section: Methodsmentioning

confidence: 99%

“…The Chapman-Enskog equation is used to estimate the mass diffusivity coefficients. The mixture properties are evaluated using appropriate mixing laws, and the effective properties are the porosity weighted average of gas phase and solid phase properties; these aspects have been discussed in detail in ref .…”

Section: Methodsmentioning

confidence: 99%

“…Grid independence studies are performed for both the grids ( t , r ), and grid independence is achieved for a temporal step of 0.1 s and radial grid size of 0.05 mm. The reader is referred to ref for the details of solution procedure, numerical model algorithm, and grid independence studies.…”

Section: Methodsmentioning

confidence: 99%

“…λ are the porosity weighted average of gas phase and solid phase properties; these aspects have been discussed in detail in ref 33.…”

Section: ■ Methodologymentioning

confidence: 99%

See 3 more Smart Citations

Thermochemical Conversion of Biomass Char under Carbon Dioxide Flux in a Thermally Supported Environment: Experimental and One-Dimensional Numerical Investigations

2022

Self Cite

View full text Add to dashboard Cite

The current work reports on the experimental and numerical investigations of biomass char conversion in a CO2-dominated environment. Having established 800 °C as the transition temperature for char conversion in terms of a threshold conversion rate, the mass loss rate of biomass char particles of different sizes (8–20 mm diameter) and two densities (220 and 350 kg/m3) are studied under a wide range of temperatures (800–1000 °C), CO2 concentrations (10%–100%), Reynolds numbers (0.01–100), and combinations thereof. The investigation broadly covers the operating conditions of practical systems. It is observed that increasing the temperature (12.5%) or reactant concentration (33%) or Reynolds number (10 times increase) reduces the conversion time scales by up to 50%. Contrary, a 22% increase in particle size and increase in particle density from 220 to 350 kg/m3 increases the conversion time by 25% and 65%, respectively. It is of interest and significance to note that temperature and reactant concentration in combination explicitly control the conversion regime (kinetic limit to diffusion limit) and as such can be used as explicit control parameters. A numerical model is employed to explore the intraparticle dynamics under different conversion regimes. The numerical model enables analysis of intraparticle temperature and reactant distribution, typically challenging through the experimental approach. Extending the analysis, a novel, first of its kind method to identify the conversion regime based on temperature and reactant concentration is hypothesized and validated. The methodology estimates the conversion regime with sufficient accuracy, with the power-law coefficient being within the 10% band.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…λ are the porosity weighted average of gas phase and solid phase properties; these aspects have been discussed in detail in ref 33.…”

Section: ■ Methodologymentioning

confidence: 99%

See 2 more Smart Citations

Thermochemical Conversion of Biomass Char under Carbon Dioxide Flux in a Thermally Supported Environment: Experimental and One-Dimensional Numerical Investigations

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…for highly turbulent flows [14]. Similarly, the molecular diffusivity of heat (α) and mass (D) in m 2 •s −3 was calculated using NASA polynomial coefficients [38] and Chapman-Enskog relation [39], respectively, at the T g obtained from OES. Further, the Péclet number (Pe) [40,41], a measure of the relative influence of convection vs. diffusion, was calculated for thermal and mass transport, expressed as,…”

Section: Transport Property and Kolmogorov Length Estimationmentioning

confidence: 99%

Influence of transitional and turbulent flow on electrical, optical, morphological and chemical characteristics of a nitrogen rotating gliding arc

Ananthanarasimhan¹,

Rao²

2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The work reports the effect of flow regime on plasma characteristics of an atmospheric N2 rotating gliding arc (RGA). When changed from transitional (5 SLPM) to turbulent (50 SLPM) flow, operation mode transitioned from glow to spark discharge due to frequent reignition events; the average reduced electric field (E/N) and electron temperature raised (38→92 Td, 0.84→2.2 eV); and gas temperature (Tg ) slightly cooled (2973→2807 K). Molecules generated for 100 eV of energy input (G–factor) increased by a factor of 20 and 65, for the chemically active singlet and triplet metastable states of N2, respectively—a promising feature for chemical applications. A sudden three fold increase in the energy efficiency, achieving a destruction of 3.0±0.2 g·kWh-1 of dilute toluene (112±10 ppmV) at highly turbulent flow corroborated the enhancement of the G–factor, E/N and Tg ; and indicated the sensitivity of plasma properties to the flow regime. Interestingly, for flows having Reynolds number ≥3×104, the bandhead of N2 + shifted from 0–0 at 391.4 nm to 3–3 at 383.3 nm attributed to higher-level perturbations, showing again the sensitivity. The smallest eddies (η≈6 μm) is less than the discharge diameter (dd≈220±90 μm), and thermal/mass Péclet number>1. The eddies of size < dd advected the plasma species, wrinkled/distorted the discharge, and increased the reignition events, eventually affected the plasma properties including the chemical performance (energy efficiency), which is observed in this work.

show abstract

Progressive inhibition of C+H2O reaction in wood char packed bed by in-situ evolving H
Mohammed Asheruddin,
Shivapuji,
Dasappa
2024
Bioresource Technology
0
0
0
0
View full text Add to dashboard Cite

Influence of gas and solid phase thermo-physical and transport properties on the thermo-chemical conversion of char in reacting media: intra-particle, microscopic and temporal mass loss-based sensitivity analysis

Cited by 6 publications

References 50 publications

Thermochemical Conversion of Biomass Char under Carbon Dioxide Flux in a Thermally Supported Environment: Experimental and One-Dimensional Numerical Investigations

Thermochemical Conversion of Biomass Char under Carbon Dioxide Flux in a Thermally Supported Environment: Experimental and One-Dimensional Numerical Investigations

Influence of transitional and turbulent flow on electrical, optical, morphological and chemical characteristics of a nitrogen rotating gliding arc

Progressive inhibition of C+H2O reaction in wood char packed bed by in-situ evolving H
Mohammed Asheruddin,
Shivapuji,
Dasappa
2024
Bioresource Technology
0
0
0
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Influence of gas and solid phase thermo-physical and transport properties on the thermo-chemical conversion of char in reacting media: intra-particle, microscopic and temporal mass loss-based sensitivity analysis

Cited by 6 publications

References 50 publications

Thermochemical Conversion of Biomass Char under Carbon Dioxide Flux in a Thermally Supported Environment: Experimental and One-Dimensional Numerical Investigations

Thermochemical Conversion of Biomass Char under Carbon Dioxide Flux in a Thermally Supported Environment: Experimental and One-Dimensional Numerical Investigations

Influence of transitional and turbulent flow on electrical, optical, morphological and chemical characteristics of a nitrogen rotating gliding arc

Progressive inhibition of C+H2O reaction in wood char packed bed by in-situ evolving HMohammed Asheruddin, Shivapuji, Dasappa 2024Bioresource Technology0000View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Progressive inhibition of C+H2O reaction in wood char packed bed by in-situ evolving H
Mohammed Asheruddin,
Shivapuji,
Dasappa
2024
Bioresource Technology
0
0
0
0
View full text Add to dashboard Cite