CFD modeling of the effects of particle shrinkage and intra-particle heat conduction on biomass fast pyrolysis

Zhong, Hanbin; Xiong, Qingang; Zhu, Yu; Liang, Shuxiu; Zhang, Juntao; Niu, Ben; Zhang, Xinyu

doi:10.1016/j.renene.2019.04.006

Cited by 57 publications

(23 citation statements)

References 33 publications

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“…Heat transfer problems have always been an interesting topic for researchers [1][2][3][4][5]. Among them, flow boiling has been extensively studied in recent decades.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field

et al. 2019

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Subcooled flow boiling is one of the major issues in the nuclear and power generation industries. If the fluid inlet temperature in the boiling area is less than the boiling temperature, the boiling process is called subcooled boiling. The symmetry of a physical system is a constant property of the system and is fixed by deformation. Using magnetohydrodynamic (MHD) forces and broken symmetry induced by nanosized particles, fluid and thermal systems can be more controlled. In this study, the effect of a magnetic field and nanoparticles on subcooled flow boiling in a vertical tube was investigated. For this purpose, a one-dimensional numerical code was used to simulate the flow and variations of various parameters that have been investigated and evaluated. The results showed that as the flow entered the heated area, the vapor volume fraction, Froude number, fluid cross-sectional area forces, mixture velocity, fluid velocity, bubble departure diameter, liquid and vapor Reynolds numbers, squared ratio of the Froude number to the Weber number, and fluid cross-sectional area forces coefficient increased. In the same region, the Eötvös number, root mean square (RMS) of the fluid cross-sectional area force, sound velocity, liquid superficial velocity, critical tube diameter, bubble departure frequency, and density of the active nucleation site were reduced. It was also observed that after the heated area and under the influence of the magnetic field and the nanoparticles, the values of the vapor volume fraction, Froude number, fluid cross-sectional area force, mixture velocity, fluid velocity, vapor, liquid Reynolds number, and squared ratio of the Froude number to the Weber number were decreased. Moreover, there was no significant effect on the Eötvös number, liquid superficial velocity, Taylor bubble Sauter mean diameter, bubble departure diameter, critical tube diameter, bubble departure frequency, or density of the active nucleation site.

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“…Heat transfer problems have always been an interesting topic for researchers [1][2][3][4][5]. Among them, flow boiling has been extensively studied in recent decades.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field

et al. 2019

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“…These components combined to form a natural fibril-based composite in which hemicellulose acts as a compatibilizer between cellulose and lignin, while lignin protects the cellulose by blocking the bacterial attacks get the nanoscale dimension of cellulose (step 2) are shown in Fig. 4 (Sfiligoj Smole et al 2019;Zhong et al 2019).…”

Section: Isolation Of the Cellulose Nanoparticlesmentioning

confidence: 99%

Renewable cellulosic nanocomposites for food packaging to avoid fossil fuel plastic pollution: a review

et al. 2020

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The extensive use of petroleum-based synthetic and non-biodegradable materials for packaging applications has caused severe environmental damage. The rising demand for sustainable packaging materials has encouraged scientists to explore abundant unconventional materials. For instance, cellulose, extracted from lignocellulosic biomass, has gained attention owing to its ecological and biodegradable nature. This article reviews the extraction of cellulose nanoparticles from conventional and non-conventional lignocellulosic biomass, and the preparation of cellulosic nanocomposites for food packaging. Cellulosic nanocomposites exhibit exceptional mechanical, biodegradation, optical and barrier properties, which are attributed to the nanoscale structure and the high specific surface area, of 533 m2 g−1, of cellulose. The mechanical properties of composites improve with the content of cellulose nanoparticles, yet an excessive amount induces agglomeration and, in turn, poor mechanical properties. Addition of cellulose nanoparticles increases tensile properties by about 42%. Barrier properties of the composites are reinforced by cellulose nanoparticles; for instance, the water vapor permeability decreased by 28% in the presence of 5 wt% cellulose nanoparticles. Moreover, 1 wt% addition of filler decreased the oxygen transmission rate by 21%. We also discuss the eco-design process, designing principles and challenges.

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“…The conversion of biomass particles in suspension condition is widely studied in the literature (e.g., see [80][81][82]). Various complexities may arise for modelling the conversion of large biomass particles in gas-solid systems, e.g., combined effects of particle shrinkage and intra-particle heat transfer [83] and a possible change in the Geldart classification during the conversion of biomass particles [84] in fluidized beds. Furthermore, even though this subject is widely investigated in the literature, in most of the studies, the focus is limited to a specific type of biomass such as wood [18,85].…”

Section: Conversion Of Srf Biomass Particlesmentioning

confidence: 99%

CPFD simulation of petcoke and SRF co–firing in a full–scale cement calciner

Nakhaei

Grévain

et al. 2019

Fuel Processing Technology

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CFD modeling of the effects of particle shrinkage and intra-particle heat conduction on biomass fast pyrolysis

Cited by 57 publications

References 33 publications

Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field

Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field

Renewable cellulosic nanocomposites for food packaging to avoid fossil fuel plastic pollution: a review

CPFD simulation of petcoke and SRF co–firing in a full–scale cement calciner

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