Modelling of particulate matter transformations and capture efficiency

Sjöblom, Jonas; Kannan, Ananda Subramani; Ojagh, Houman; Ström, Henrik

doi:10.1002/cjce.22004

Cited by 5 publications

(6 citation statements)

References 29 publications

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“…Our prime objective was to investigate the PM nature as it is reaching the after-treatment components and, hence, we did not measure the solid part of the PM using a catalytic stripper. However, a monolithic reactor (even being catalytically inert) can serve as a useful tool to assess the HC content in exhaust flows, which is described more in ref . By applying this methodology, further validation of the conceptual model (or any analogue model) for HC content can be performed; such work is also ongoing at our department.…”

Section: Resultsmentioning

confidence: 97%

“…This conceptual model is potentially a very useful tool to obtain PM characteristics in situ. 7 However, it relies on the assumption that the theoretical models describing Brownian diffusion as the main phenomenon determining the automotive PM motion and deposition in the absence of HC evaporation are reliable. In this study, solid nanoparticles of NaCl were produced to obtain an inert feed of PM into the exhaust gas after-treatment system.…”

Section: ■ Conclusionmentioning

confidence: 99%

“…This assumption was verified when the flow field and concentration gradients were resolved in detailed CFD simulations. 7 However, when proposing the HC evaporation as the main explanation to the experimental observations, one important assumption had to be made: That when HC evaporation was compensated for, the main capture process is predominantly the Brownian diffusion, and that the CE thus could be predicted using the existing theoretical models together with the new HC evaporation model. In other words, the HC evaporation mechanism was assumed to dominate all other possible particle deposition phenomena (e.g., inertial impaction, thermophoresis, lift forces, and interception mechanisms) not included in the theoretical model.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The tanks-in-series model assumed a bulk concentration of HC equal to zero (i.e., assuming that the diffusion process of HC to the wall was faster than the evaporation process). This assumption was verified when the flow field and concentration gradients were resolved in detailed CFD simulations . However, when proposing the HC evaporation as the main explanation to the experimental observations, one important assumption had to be made: That when HC evaporation was compensated for, the main capture process is predominantly the Brownian diffusion, and that the CE thus could be predicted using the existing theoretical models together with the new HC evaporation model.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Validation of Particulate Matter (PM) Capture in Open Substrates

Sjöblom

Ström

Kannan

et al. 2014

Ind. Eng. Chem. Res.

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The capture of engine-borne particulate matter (PM) in after-treatment systems is a complex process. Because of the intrinsic heterogenic nature of the PM, the particles undergo transformations that make it very difficult to isolate their motion and deposition in experiments. In a previous study, a model for hydrocarbons (HC) evaporation of the particles during the capture process was proposed to explain experimental results that showed a significant increase in the capture efficiency when compared to those predicted from theoretical models [J. Sjoblom and H. Strom, Ind. Eng. Chem. Res. 2013, 52, 8373]. In this work, inert NaCl particles were fed to an open substrate (cordierite monolith). It was demonstrated that the capture efficiency can be experimentally observed, isolated from other experimental phenomena and uncertainties, if the particles are truly inert. Consequently, the previously proposed model for HC evaporation is a valid starting point for development of comprehensive models for PM motion and transformations.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Conclusionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Validation of Particulate Matter (PM) Capture in Open Substrates

Sjöblom

Ström

Kannan

et al. 2014

Ind. Eng. Chem. Res.

Self Cite

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“…A key factor responsible for the failure of porous medium filters is pore blockage, which directly results from ash deposition in the channels of the filter. In the past 30 years, most studies have concentrated on the filter structure, capture performance, flow field characteristics, motion and deposition laws of particles and ashes, regeneration characteristics, and blockage of filter channels, but research on diesel particulate filter failure is rare.…”

Section: Introductionmentioning

confidence: 99%

Failure recognition of the diesel particulate filter based on catastrophe theory

et al. 2016

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In order to effectively recognize the failure behaviour of the diesel particulate filter (DPF), a failure cusp catastrophe model of a porous medium filter in DPF was established using catastrophe theory and diffeomorphism transformation based on the flow resistance model of a porous medium filter with ash deposition. Then, critical points and singular points of the failure cusp catastrophe model were solved and the discriminant of the DPF failure cusp catastrophic model was obtained, which was used to recognize the failure behaviour of the DPF. Finally, failure or critical state details of DPF were acquired via calculation examples, and recognition results of the DPF failure behaviour were verified on the engine bench test. Recognition results of the failure state are consistent with the experimental ones, which confirms the validity of failure recognition based on the failure cusp catastrophe model of DPF, and provides a theoretical basis and reference for research on the failure prediction and diagnosis, as well as the anti-failure, of DPF.Keywords: catastrophe theory, diesel particulate filter, ash deposition, failure, recognition INTRODUCTION D iesel particulate filters (DPF) whose core component is a porous medium filter have been shown to significantly reduce particulate matter (PM) emissions from diesel engines. Further application of diesel particulate filters in automobiles is restricted due to the short life of the porous medium filter. Therefore, how to improve its durability and service life has become an urgent problem. To address this, the failure mechanism of the porous medium filter of DPF requires in-depth study.A key factor responsible for the failure of porous medium filters is pore blockage, which directly results from ash deposition in the channels of the filter. In the past 30 years, most studies have concentrated on the filter structure, capture performance, flow field characteristics, motion and deposition laws of particles and ashes, regeneration characteristics, and blockage of filter channels, [1,2] but research on diesel particulate filter failure is rare. Researchers have carried out theoretical and experimental studies on the ash deposition and pore clogging of porous medium filters, and have optimized their structure in order to extend their service life. Among experimental studies, a vehicle experimental study on the road loading a DPF found that ash comprises > 80 % of the sediment inside the filter.[3] The ash deposition process of DPF on heavy-duty diesel vehicles, physical and chemical properties of ash particles in channels of the porous medium filter, properties of the ash layer, and its effects on the capture performance and the regeneration characteristics of DPF were experimentally studied. [4][5][6] A rapid assessment method of DPF aging based on ash deposition was established. [7] For theoretical studies, a prediction model of exhaust back pressure in the DPF was established by Heibel and Bhargava based on the ash deposition and the regeneration characteristics.[8] To in...

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How do you write and present research well? Q4 – Do not metastasize with metadiscourse

2015

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In the classic writing style, writers recognize that readers are competent and will recognize the truth as you lead them through your work. Soggy prose seeks “to argue for the truth.”[1] Your text should read like a conversation rather than a lecture. Match each sentence with one of the cardinal sins of writing to the left.[2,3] (Multiple choices possible) 1 Hedgingb)In general these results show that a system with zero‐cost identities does not require centralized allocation of identities to encourage cooperation.[4]2 Signpostingf)In this section we shall evaluate the rate of recombination for nonequilibrium conditions.[5]3 Redundantc)Here we report our new results on the samarium‐arsenide.[6]4 Self‐conscious, 6 Boostinge)Whether established pests are suitable for attempted eradication is extremely controversial.[7]5 Narcissismd)More recently researchers have attempted to quantify the effects of anxiety on foreign language learning.[8]6 Boostinga)These results are extremely significant statistically and compare favorably with validation studies.[9]

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Modelling of particulate matter transformations and capture efficiency

Cited by 5 publications

References 29 publications

Experimental Validation of Particulate Matter (PM) Capture in Open Substrates

Experimental Validation of Particulate Matter (PM) Capture in Open Substrates

Failure recognition of the diesel particulate filter based on catastrophe theory

How do you write and present research well? Q4 – Do not metastasize with metadiscourse

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