Title
Effect of soot particle deposition on porous fouling formation and thermal characteristics of an exhaust gas recirculation cooler
Author
Khoshnood, Alireza (Tarbiat Modares University)
Maerefat, Mehdi (Tarbiat Modares University)
Imani, Gholamreza (Persian Gulf University)
Hooman, K. (TU Delft Process and Energy) 
Department
Process and Energy
Date
2023
Abstract
Exhaust gas recirculation (EGR) systems have been successfully employed to reduce the NOx emissions in diesel engines. However, the fouling problem in EGR coolers challenges their capability to comply with stringent environmental regulations. A few numerical simulations have considered the fouling growth in EGR coolers. Those studies modeled the evolving fouling layer to be a solid medium, therefore, fluid flow and convection heat transfer within the fouling layer, which is well-documented to be a porous medium permeable to gas flow, have not been considered yet. As such, the present study investigates the simultaneous effects of the formation of the evolving porous fouling layer (EPFL) at the walls of an EGR cooler and fluid flow and convection heat transfer simulation within this EPFL to determine its coupled effects on the thermal performance of the EGR cooler. This study also investigates the possibility of formation of a steady fouling layer (SFL) because of the opposing effects of the fouling layer growth and deposition rate. The effects of two pertinent dimensionless parameters, namely Darcy number (10-4≤Da≤5×10-3) and Reynolds number (100≤Re≤400) on the time history of the fouling layer growth, deterioration of the thermal performance of the duct, and average Nusselt number ratio (Nuav/Nuavt=0) are studied. The results show that the thermal performance of the duct decreases as the EPFL grows, which agrees well with the available experimental data. It is shown that the steady fouling layer is obtained due to a decrease in thermophoretic force and deposition rate, as a result of the EPFL formation. Finally, a correlation is proposed in terms of Reynolds and Darcy numbers for the time at which the SFL occurs.
Subject
Evolving porous fouling layer
Exhaust gas recirculation cooler
Lattice Boltzmann method
Particle deposition
Steady fouling layer
Thermophoresis
To reference this document use:
http://resolver.tudelft.nl/uuid:7111e9d6-818d-491d-be8e-b2e6d28b7e6d
DOI
https://doi.org/10.1016/j.applthermaleng.2023.120629
Embargo date
2023-10-22
ISSN
1359-4311
Source
Applied Thermal Engineering, 229
Bibliographical note
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2023 Alireza Khoshnood, Mehdi Maerefat, Gholamreza Imani, K. Hooman