Flow Maldistribution Effects on DPF Performance

Koltsakis, G. C.; Samaras, Zissis; Echtle, Harald; Chatterjee, Daniel; Markou, P.; Haralampous, O. A.

doi:10.4271/2009-01-1280

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…In order to better quantify this behaviour, the inlet velocities are presented in Figure . As it is expected, some flow maldistribution is already present in the intact filter due to the cone effect. After the filter is damaged, the mass flow rate in the failed area increases by 40% and 70% for the two failure levels respectively, while the local filtration efficiency drops to about 30% for both.…”

Section: Modelling Of a Partially Failed Filtersupporting

confidence: 51%

Approximate pressure drop and filtration efficiency expressions for semi‐open wall‐flow channels

Haralampous

Kontzias

2014

Can J Chem Eng

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Semi-open wall-flow channels are conventional filter channels with missing plugs either in the frontal or rear side. This configuration has lately become an interesting modelling issue with respect to partial filters designed for the emerging markets and as a special case of wall-flow filters, that have suffered damage due to regeneration. This paper presents the development of approximate analytical expressions for the estimation of pressure drop and filtration efficiency of semi-open channels. In order to facilitate the derivation, realistic assumptions are employed and the results are extensively validated using a commercial simulation software, able to solve the differential equations system of the 1D channel model. The validation covers important design parameters and operational conditions, namely filter permeability, length, mass flow rate and soot loading. It is shown that the analytical expressions can predict all trends and moreover offer clear physical explanations. The pressure drop calculation does not exceed 6 % of the numerical prediction, while the filtration efficiency absolute error lies within 6 % except for specific cases. Finally, a partially failed DPF is simulated using the developed expressions and a commercial CFD package in order to estimate the failure effect on filtration and pressure drop performance. In this way, the usability of the proposed modelling approach is demonstrated.

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Section: Modelling Of a Partially Failed Filtersupporting

confidence: 51%

Approximate pressure drop and filtration efficiency expressions for semi‐open wall‐flow channels

Haralampous

Kontzias

2014

Can J Chem Eng

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“…As a result, the simulation produced quite accurate results in the periphery for the period of interest. The importance of inlet temperature profile has been further investigated by the authors using CFD coupling (Koltsakis et al 2009b ), as shown in Figure 51 , and will be discussed in the following sections.…”

Section: Inlet Temperature Profilementioning

confidence: 99%

“…Due to the importance of system packaging restrictions, aftertreatment devices require careful mounting and positioning to avoid unwanted effects from flow maldistribution (Hinterberger et al 2007, Koltsakis et al 2009b. In this case, it is important to calculate the influence of flow and temperature nonuniformities by simulating in a 3D environment the complete exhaust aftertreatment system.…”

Section: Coupling With Cfd Codesmentioning

confidence: 99%

“…Subsequently, the localized soot consumption uncovers regions with lower flow resistance, resulting in higher local velocities and faster cooling. Figure 57 Computed outlet temperature profiles, soot loading fields, and inlet flow profiles during a transient regeneration of a filter with bent inlet pipe geometry (Koltsakis et al 2009b ).…”

Section: Coupling With Cfd Codesmentioning

confidence: 99%

“…Effect of diffuser geometry on inlet gas temperature, temperature profile at the peak of the regeneration, and final soot loading (Koltsakis et al 2009b ).…”

Section: Figure 58mentioning

confidence: 99%

See 2 more Smart Citations

Catalyzed diesel particulate filter modeling

Koltsakis

Haralampous

Depcik

et al. 2013

Reviews in Chemical Engineering

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An increasing environmental concern for diesel particulate emissions has led to the development of efficient and robust diesel particulate filters (DPF). Although the main function of a DPF is to filter solid particles, the beneficial effects of applying catalytic coatings in the filter walls have been recognized. The catalyzed DPF technology is a unique type of chemical reactor in which a multitude of physicochemical processes simultaneously take place, thus complicating the tasks of design and optimization. To this end, modeling has contributed considerably in reducing the development effort by offering a better understanding of the underlying phenomena and reducing the excessive experimental efforts associated with experimental testing. A comprehensive review of the evolution and the most recent developments in DPF modeling, covering phenomena such as transport, fluid mechanics, filtration, catalysis, and thermal stresses, is presented in this article. A thorough presentation on the mathematical model formulation is given based on literature references and the differences between modeling approaches are discussed. Selected examples of model application and validation versus the experimental data are presented.

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