Turbulent couette flow between corrugated walls: The case with motion of one wall perpendicular to the corrugation cavities

Nasab, Nina Rajabi; Mithrush, Troy; Olson, James A.; Martinez, D. Mark

doi:10.1002/cjce.22008

Cited by 2 publications

(3 citation statements)

References 34 publications

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“…Literature in this research area is very limited; to our best knowledge, the disc refining process modeling based on fundamental mechanics in energy consumption prediction has not been reported for either pulping or biorefinery applications. However, a few researchers − have been developing computational fluid dynamics (CFD) models to understand the low-consistency pulping process in disc refiners. The computational domain is usually simplified to reduce computational complexity.…”

Section: Introductionmentioning

confidence: 99%

“…The computational domain is usually simplified to reduce computational complexity. Some works , reported two-dimensional geometry for disc refining modeling, while others , believe that the three-dimensional (3D) flow characteristics are critical in modeling the disc refining process. While the reported studies use simplified geometries for disc refiner plates, we believe that using 3D, high-fidelity refiner plate geometry is critical to correctly predict the flow behavior and energy consumption in the disc refining process.…”

Section: Introductionmentioning

confidence: 99%

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Modeling the Disc Refining of Lignocellulosic Biomass toward Reduced Biofuel Production Cost and Greenhouse Gas Emissions: Energy Consumption Prediction and Validation

Sievers

Chen

2021

ACS Sustainable Chem. Eng.

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Disc refining is a critical step in the deacetylation and mechanical refining (DMR) pretreatment process for the conversion of herbaceous biomass to biofuels. It is very effective in breaking down the biomass structures to increase enzyme accessibility and sugar yield. However, it is also an energy-intensive process, which consumes fossil electricity, generating greenhouse gas (GHG) emissions, and limits its commercialization in the biorefinery industry. To the authors’ best knowledge, this work is the first to report the development of a physics-based model in predicting the refining energy consumption during the biomass disc refining process. The developed model demonstrated its capability in accurately predicting the refining energy consumption under different operation conditions. Simulations show that the net refining energy consumption, net refining energy efficiency, and specific net energy increase with the increase in rotation speed and the decrease in the refiner plate gap. A convergence trend of these attributes was also observed between larger and smaller refiner plate gaps at increasing rotation speeds. In the scaling-up of the DMR pretreatment process, this model will be a powerful tool in the refiner plate design and operation parameter optimization to reach optimum refining energy consumption to reduce biofuel production cost and GHG emissions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling the Disc Refining of Lignocellulosic Biomass toward Reduced Biofuel Production Cost and Greenhouse Gas Emissions: Energy Consumption Prediction and Validation

Sievers

Chen

2021

ACS Sustainable Chem. Eng.

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“…It is shown that the results of the Newtonian model in their study are close to that of the non-Newtonian model based on the experimental measurements of Ventura et al. 13 A simplified model of an LC refiner is considered in Nasab et al 14 assuming a Newtonian turbulent flow in a two-dimensional geometry. The grooves geometry in their study comprised of two opposing cavities in which the flow was driven by the movement of the upper cavity.…”

Section: Introductionmentioning

confidence: 55%

Investigation of pulp flow helicity in rotating and non-rotating grooves

Jouybari

Engberg

Persson

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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Numerical simulation of pulp flow in rotating and non-rotating grooves is carried out to investigate the effect of pulp rheological properties and groove geometry on the rotational motion of the pulp flow. The eucalyptus pulp suspension is considered as a working fluid in the present study whose apparent viscosity correlation is available from the experimental measurements reported in the literature. The simulations are carried out with OpenFoam for different values of pulp material, fiber concentrations, and groove cross-section. Helicity is introduced to measure the turnover rate of pulp flow in the groove due to the importance of such motion on the final properties of the pulp flow. A measurement of helicity magnitude and its distribution along the groove revealed that a change in the pulp material would significantly affect the flow structures within the groove. Further investigation on the effects of fiber concentration, c, showed that this parameter does not have a significant effect on the averaged helicity magnitude for c = 2.0 and 2.5, whereas the helicity distribution over the groove cross-section changes clearly for c = 1.5. The results showed that the helicity level is negligible for almost half of the cavity cross-section in the non-rotating groove simulations, which can be considered as a shortcoming of the original geometry of the groove. Therefore, a smaller cross-section for the groove is considered through which an enhancement in the helicity magnitude is observed.

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Turbulent couette flow between corrugated walls: The case with motion of one wall perpendicular to the corrugation cavities

Cited by 2 publications

References 34 publications

Modeling the Disc Refining of Lignocellulosic Biomass toward Reduced Biofuel Production Cost and Greenhouse Gas Emissions: Energy Consumption Prediction and Validation

Modeling the Disc Refining of Lignocellulosic Biomass toward Reduced Biofuel Production Cost and Greenhouse Gas Emissions: Energy Consumption Prediction and Validation

Investigation of pulp flow helicity in rotating and non-rotating grooves

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