Review of Soot Deposition and Removal Mechanisms in EGR Coolers

Abarham, Mehdi; Hoard, John; Assanis, Dennis N.; Styles, Daniel; Curtis, Eric W.; Ramesh, Nitia

doi:10.4271/2010-01-1211

Cited by 64 publications

(28 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The flow in EGR coolers can be laminar or turbulent [2]. Several studies have shown that fluid drag force is the dominant re-entrainment force for deposited particles [8,9,20]. If the drag force is larger than the adhesion force for small particles, removal occurs.…”

Section: Engine Experimentsmentioning

confidence: 99%

“…Thermophoresis is particle motion in the presence of a temperature gradient. Collisions with more energetic gas molecules on the hot gas side vs. the cold gas molecules near the channel wall leads to net motion of particles towards the wall [8]. Lance et al [16,17] directly measured the thermal properties of EGR cooler deposits and found that the soot cake formed on cooler walls is approximately 98% porous.…”

Section: Introductionmentioning

confidence: 98%

“…There have been many recent investigations related to EGR cooler fouling [3][4][5][6][7][8][9][10][11][12][13][14][15]. It has been extensively reported from these studies that thermophoresis is the dominant mechanism for deposition of submicron particles under non-isothermal conditions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of water vapor condensation on exhaust gas recirculation cooler fouling

Warey

Bika

Long

et al. 2013

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

Section: Engine Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Influence of water vapor condensation on exhaust gas recirculation cooler fouling

Warey

Bika

Long

et al. 2013

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

“…The importance of thermophoresis has been exhaustively studied, particularly with soot particles [17,38], and this phenomenon has been shown to be most relevant for small particles [39]. The thermophoretic effect was result in a mean mass increase of approximately 50% under the conditions used for our previous experiments [16].…”

Section: Mean Valuesmentioning

confidence: 99%

Experimental study of soot particle fouling on ribbed plates: Applicability of the critical local wall shear stress criterion

Paz

Suárez

Concheiro

et al. 2013

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

This article examines the notion of critical wall shear stress as the key control parameter of the local fouling removal process. In this study, an experimental setup was developed for measuring fouling on enhanced surfaces. Specifically, the experimental configuration consists of a forced convection plate heat exchanger containing a one-pass rectangular channel with two ribbed plates arranged in a symmetrically staggered manner. The exhaust gases flow by the rib-roughened sides of the plates, and the flat sides can be cooled with water from the independent external coolant circuit.As a result of soot particle deposition from exhaust gases, a layer of fouling is deposited over the ribs.After asymptotic conditions were reached during the tests, detailed fouling thickness measurements were conducted. The dimensionless particle relaxation time during these tests was determined to be in the range of 0.3-10. The measurements were then complemented with a numerical analysis. In particular, the local wall shear stress was calculated using a commercial computational fluid dynamics (CFD) software package.The fouling thickness profiles deposited over the ribs and the local critical shear stress values were compared and discussed for two different geometries. The results obtained clearly support the idea that critical wall shear stress is an appropriate criterion for facilitating the understanding of the local behaviour of fouling deposits.

show abstract

“…Abarham et al (2010) investigated soot deposition and removal mechanisms in EGR coolers. They analytically studied various soot deposition mechanisms and determined that thermophoresis is the dominant mechanism for deposition of submicron particles under nonisothermal conditions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Soot Deposition and Particle Nucleation in Exhaust Gas Recirculation Coolers

Bika

Warey

Long

et al. 2012

Aerosol Science and Technology

View full text Add to dashboard Cite

Cooled exhaust gas recirculation (EGR) is used to control engine out NO x (oxides of nitrogen) emissions from modern diesel engines by re-circulating a portion of the exhaust gases into the intake manifold of an engine after cooling it through a heat exchanger commonly referred to as an EGR cooler. However, EGR cooler fouling due to presence of soot particles and hydrocarbons (HC) in engine exhaust leads to a decrease in cooler efficiency and increased pressure drop across the cooler. This can adversely affect the combustion process, engine durability, and emissions. In this study, a multicylinder diesel engine was used to produce a range of engine out HC and soot concentrations to investigate soot deposition and particle nucleation in an EGR cooler. A portion of the engine exhaust was passed through an EGR cooler, while particle size and HC concentration measurements were made at the cooler inlet and outlet. Tests were conducted over a range of EGR cooler coolant temperatures and engine out soot and HC concentrations to determine the impact on the nucleation and accumulation modes of the exhaust particle size distributions. A reduction in the accumulation mode particle concentration at the EGR cooler outlet was observed for high soot concentrations indicating soot deposition within the EGR cooler. As the EGR coolant temperature was reduced, the outlet accumulation mode particle concentration was reduced further, indicating increased soot deposition in the cooler due to increased thermophoresis. There were no signs of diffusiophoresis due to HC diffusion within the cooler over the range of conditions used in the study. A significant increase in outlet nucleation mode particle concentration was observed for the low soot concentrations. This mode increased with either increasing HC concentration or decreasing coolant temperature, indicating the saturation ratio (SR) dependence of the nucleation mode formation. However, as the soot concentration was increased, the nucleation mode disappeared because of HC adsorption onto the increased soot surface area.

show abstract

Review of Soot Deposition and Removal Mechanisms in EGR Coolers

Cited by 64 publications

References 19 publications

Influence of water vapor condensation on exhaust gas recirculation cooler fouling

Influence of water vapor condensation on exhaust gas recirculation cooler fouling

Experimental study of soot particle fouling on ribbed plates: Applicability of the critical local wall shear stress criterion

Characterization of Soot Deposition and Particle Nucleation in Exhaust Gas Recirculation Coolers

Contact Info

Product

Resources

About