In-situ visualization of exhaust soot particle deposition and removal in channel flows

被引：28

作者：

Abarham, Mehdi ^{[1
]}

Chafekar, Tejas ^{[1
]}

Hoard, John W. ^{[1
]}

Salvi, Ashwin ^{[1
]}

Styles, Dan J. ^{[2
]}

Sluder, C. Scott ^{[3
]}

Assanis, Dennis ^{[1
]}

机构：

[1] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA

[2] Ford Motor Co, Res & Adv Engn, Dearborn, MI 48124 USA

[3] Oak Ridge Natl Lab, Fuels Engines & Emiss Res Lab, Oak Ridge, TN 37830 USA

来源：

CHEMICAL ENGINEERING SCIENCE | 2013年 / 87卷

关键词：

Thermophoresis; Particulate deposition; Water condensation; Deposit removal; Flaking; In-situ observation;

D O I：

10.1016/j.ces.2012.09.025

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Exhaust gas recirculation (EGR) coolers are used in diesel engines to reduce emissions of nitrogen oxides. Thermophoretic particle deposition occurring in EGR coolers causes a significant degradation in the cooler effectiveness generally followed by the stabilization of cooler effectiveness after long exposure times. Mechanisms responsible for this stabilization are not clearly understood. To investigate the stabilization trend, a visualization test rig was developed to track the dynamics of diesel exhaust soot particulate deposition and removal in-situ. A digital microscope records surface characteristics. A medium duty engine is used to generate the exhaust stream. A steady state condition was selected to run the engine for the deposition tests. In contrast to conventional understanding, large particles (tens of microns) were observed in diesel exhaust. Interesting results are observed for flaking/removal of the deposit layer during designed removal experiments. Water condensation at a low coolant temperature and bombardment of large particles resulted in a significant removal of deposit in the form of flakes while thermal expansion or shear force (low velocities) alone did not remove the deposit layer. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：359 / 370

页数：12

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