Direct Measurement of EGR Cooler Deposit Thermal Properties for Improved Understanding of Cooler Fouling

2009-01-1461

04/20/2009

Event
SAE World Congress & Exhibition
Authors Abstract
Content
Exhaust gas recirculation (EGR) cooler fouling has become a significant issue for compliance with NOx emissions standards. This paper reports results of a study of fundamental aspects of EGR cooler fouling. An apparatus and procedure were developed to allow surrogate EGR cooler tubes to be exposed to diesel engine exhaust under controlled conditions. The resulting fouled tubes were removed and analyzed. Volatile and non-volatile deposit mass was measured for each tube. Thermal diffusivity of the deposited soot cake was measured by milling a window into the tube and using the Xenon flash lamp method. The heat capacity of the deposit was measured at temperatures up to 430°C and was slightly higher than graphite, presumably due to the presence of hydrocarbons. These measurements were combined to allow calculation of the deposit thermal conductivity, which was determined to be 0.041 W/mK, only ∼1.5 times that of air and much lower than the 304 stainless steel tube (14.7 W/mK). The main determinant of the deposit thermal conductivity is density, which was measured to be just 2% that of the density of the primary soot particles (or 98% porous). The deposit layer thermal resistance was calculated and compared with estimates of the thermal resistance calculated from gas temperature data during the experiment. The deposit properties were also used to further analyze the temperature data collected during the experiment.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-1461
Pages
6
Citation
Lance, M., Sluder, C., Wang, H., and Storey, J., "Direct Measurement of EGR Cooler Deposit Thermal Properties for Improved Understanding of Cooler Fouling," SAE Technical Paper 2009-01-1461, 2009, https://doi.org/10.4271/2009-01-1461.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-1461
Content Type
Technical Paper
Language
English