A CFD pressure drop model for microfibrous entrapped catalyst filters using micro-scale imaging

Gu, Qiang; Henderson, Robert T.; Tatarchuk, Bruce J.

doi:10.1080/19942060.2015.1094415

Cited by 3 publications

(5 citation statements)

References 16 publications

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“…25 Reynolds number analysis for packed beds and monolith also indicate turbulent flow in these reactors. This result has been verified by a numerical analysis, 26 in which velocity profile within MFEC is acquired by the Navier−Stokes equation. Plug flow is found to exist in this velocity range within a very thin boundary layer.…”

Section: Resultssupporting

confidence: 55%

“…This result has been verified by a numerical analysis, in which velocity profile within MFEC is acquired by the Navier–Stokes equation. Plug flow is found to exist in this velocity range within a very thin boundary layer . The mass balance for a plug-flow reactor is given by It has been previously determined that ozone decomposition at high face velocity is a mass-transfer-limited reaction .…”

Section: Resultssupporting

confidence: 54%

“…Plug flow is found to exist in this velocity range within a very thin boundary layer. 26 The mass balance for a plug-flow reactor is given by…”

Section: Resultsmentioning

confidence: 99%

“…The mass efficiency term in HCE for the MFEC reactor was measured using a tubular reactor at different system pressures. Previous efforts 26 have been made to use both experimental and computational fluid dynamics (CFD) techniques to determine the pressure-drop term for MFECs. Because the geometric structure of an MFEC is affected when the system pressure changes, the experimental pressure drop was preferred in this study to avoid erroneous assumptions during simulations.…”

Section: Mfec Reactormentioning

confidence: 99%

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Comparison of Packed Beds, Washcoated Monoliths, and Microfibrous Entrapped Catalysts for Ozone Decomposition at High Volumetric Flow Rates in Pressurized Systems

Zhao

Henderson

et al. 2016

Ind. Eng. Chem. Res.

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Weight- and volume-sensitive systems such as aircraft require restrictive ducting, which leads to high face velocities (10–40 m/s) in reactive structures. A head-to-head comparison was conducted experimentally among packed beds (estimated data), monoliths, and microfibrous entrapped catalysts (MFECs) during ozone decomposition to investigate the effects of system pressure on the effective reaction rate, gas–solid mass-transfer rate, and heterogeneous contacting efficiency (HCE, the ratio of the logarithmic ozone removal to the pressure drop across the reactor). For the same mass flow rate, higher-pressure systems (2–3 atm) operate at lower face velocities than atmospheric-pressure systems. These higher system pressures result in increased residence times and reaction rates; therefore, HCE is enhanced. In addition, the HCE for the MFEC was more than twice that of the packed bed or monolith at equivalent system pressures because of the higher gas–solid mass-transfer rates and reduced pressure drops of the MFEC.

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Section: Resultssupporting

confidence: 55%

Section: Resultssupporting

confidence: 54%

“…Plug flow is found to exist in this velocity range within a very thin boundary layer. 26 The mass balance for a plug-flow reactor is given by…”

Section: Resultsmentioning

confidence: 99%

Section: Mfec Reactormentioning

confidence: 99%

See 2 more Smart Citations

Comparison of Packed Beds, Washcoated Monoliths, and Microfibrous Entrapped Catalysts for Ozone Decomposition at High Volumetric Flow Rates in Pressurized Systems

Zhao

Henderson

et al. 2016

Ind. Eng. Chem. Res.

Self Cite

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“…In the experimental works, the evolvement of pressure loss over the filter lifetime and the evolution of fractional efficiency and its dependence on parameters like flow velocity and fluid properties have mainly been investigated (Charvet et al, 2008;Frising et al, 2004Frising et al, , 2005Gu et al, 2015;Payet et al, 1992;Raynor & Leith, 2000). Partially, phenomenological models were developed based on experimental results, e.g.…”

Section: Introductionmentioning

confidence: 99%

Macro-scale modeling and simulation of two-phase flow in fibrous liquid aerosol filters

Baumann

Hoch

Behringer

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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Similar to fine dust, liquid aerosols represent a risk to human health since small droplets may enter the respiratory system and cause health problems or severe diseases, such as COVID-19. Oil mist emissions from production processes and from air brakes are reduced by filters and by air dryer cartridges, respectively, while virus-like aerosols are removed by face-masks. Since the two-phase flow processes involved are highly complex and occur on vastly different scales ranging from the scale of single droplets and fibers up to the scale of a whole filter or face mask, the modeling and simulation is extremely challenging. In this work, we present a macro-scale approach for modeling and simulation of the two-phase flow processes in fibrous filters which allows predicting both pressure loss and filtration efficiency from new to steady-state where material parameters and constitutive relationships are obtained based on nano CT scans and micro-scale simulations. Compared to previous work, this approach starts from a physical basis as it relies on mass and momentum conservation and is then closed by material laws. Using this macro-scale approach it is found that both pressure loss and oil mass at steady-state are in good agreement with experimental findings.

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Critical review on microfibrous composites for applications in chemical engineering

Yang

Zhu

Bao

et al. 2021

Reviews in Chemical Engineering

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Microfibrous composites (MCs) are novel materials with unique structures and excellent functional properties, showing great potential in industrial applications. The investigation of the physicochemical properties of MCs is significant for accommodating the rapid development of high-efficiency chemical engineering industries. In this review, the characteristics, synthesis and applications of different types of previously reported MCs are discussed according to the constituent fibres, including polymers, metals and nonmetals. Among the different types of MCs, polymer MCs have a facile synthesis process and adjustable fibre composition, making them suitable for many complex situations. The high thermal and electrical conductivity of metal MCs enables their application in strong exothermic, endothermic and electrochemical reactions. Nonmetallic MCs are usually stable and corrosion resistant when reducing and oxidizing environments. The disadvantages of MCs, such as complicated synthesis processes compared to those of particles or powders, high cost, insufficient thorough study, and unsatisfactory regeneration effects, are also summarized. As a result, a more systematic investigation of MCs remains necessary. Despite the advantages and great application potential of microfibrous composites, much effort remains necessary to advance them to the industrial level in the chemical engineering industry.

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A CFD pressure drop model for microfibrous entrapped catalyst filters using micro-scale imaging

Cited by 3 publications

References 16 publications

Comparison of Packed Beds, Washcoated Monoliths, and Microfibrous Entrapped Catalysts for Ozone Decomposition at High Volumetric Flow Rates in Pressurized Systems

Comparison of Packed Beds, Washcoated Monoliths, and Microfibrous Entrapped Catalysts for Ozone Decomposition at High Volumetric Flow Rates in Pressurized Systems

Macro-scale modeling and simulation of two-phase flow in fibrous liquid aerosol filters

Critical review on microfibrous composites for applications in chemical engineering

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