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Effects of coolant temperature on particulate deposition and cooling efficiency of EGR coolers

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An Erratum to this article was published on 15 July 2021

This article has been updated

Abstract

Porous fouling layers formed by particulate deposition in the EGR cooler tubes degrade the cooling efficiency of the EGR coolers. This research has investigated the changes of the particulate concentration under varied coolant temperature conditions and the effects of the coolant temperature on the cooling efficiency of the cooler tubes by measuring the particulate concentration and size distribution at the cooler inlet and outlet. The experiment results indicate that for the particulates of different sizes, the thermophoretic force acting on them and the regeneration vary under the same experiment conditions, presenting distinctive effects on the particulate concentration distribution in the exhaust gas and causing concentrations of nuclear particulates and aggregated particulates to change, respectively. The mass of fouling layers inside the cooler tubes increases as the coolant temperature decreases. Decreasing the coolant temperature not only increases the quantity of fouling particulates but also forms more particulates of big sizes, causing cooling efficiency of the cooler tube per unit length to decrease with the decrease of coolant temperature and the increase of the tube length.

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Abbreviations

EGR :

Exhaust gas recirculation

PM :

Particulate matter

s :

Axial movement distance of particles

V 0 :

EGR gas flow velocity

r :

Cooler tube radius

V th :

Thermophoretic velocity

K th :

The thermophoretic coefficient

v :

EGR gas kinematic viscosity

T :

Gas temperature (K)

ΔT :

Temperature gradient

η :

EGR cooler efficiency

T EGR in :

EGR gas temperature at the gas-in location

T EGR out :

EGR gas temperature at the gas-out location

T cool in :

Coolant-in temperature.

η d :

EGR cooler efficiency per unit length

n :

Number of EGR cooler tubes

L :

Length of the EGR cooler tubes

m deposit :

Deposit layer mass

m A :

Mass of the cooler tubes with deposits

m B :

Mass of the cooler measured before experiment

ε :

Particle concentration reduction rate

N in :

Particulate concentration at the inlet of the EGR cooler

N out :

Particulate concentration at the outlet of the EGR cooler

N de :

Quantity of the deposited particulates

N re :

Quantity of regenerated particulates

ΔN de :

Change in the quantity of deposited particulates

ΔNre :

Change in the quantity of regenerated particulates

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Acknowledgments

This research is sponsored by the National Natural Science Found of China (No. 51776177) and the Chunhui Program founded by the Ministry of Education of People’s Republic of China (No. Z2015083).

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Authors and Affiliations

  1. Fluid and Power Machinery Key Laboratory of Ministry of Education, Xihua University, Chengdu, 610039, China

    Xun Zhang, Wei Tian, Jinhui Li, Zhiqiang Han & Xueshun Wu

Authors
  1. Xun Zhang
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  2. Wei Tian
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  3. Jinhui Li
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  4. Zhiqiang Han
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  5. Xueshun Wu
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Corresponding author

Correspondence to Xueshun Wu.

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Xueshun Wu, born in 1987, with the Master’s degree in Energy and Power Engineering from the School of Mechanical Engineering at Tianjin University, worked in the School of Transportation and Automotive Engineering at Xihua University. His main research interests focus on automotive engine combustion and control.

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Zhang, X., Tian, W., Li, J. et al. Effects of coolant temperature on particulate deposition and cooling efficiency of EGR coolers. J Mech Sci Technol 35, 3231–3237 (2021). https://doi.org/10.1007/s12206-021-0643-8

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  • DOI: https://doi.org/10.1007/s12206-021-0643-8

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