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    Condensation Analysis of Exhaust Gas Recirculation System for Heavy-Duty Trucks

    Source: Journal of Thermal Science and Engineering Applications:;2011:;volume( 003 ):;issue: 004::page 41007
    Author:
    Bing-Jian Yang
    ,
    Shaolin Mao
    ,
    Orhan Altin
    ,
    Zhi-Gang Feng
    ,
    Efstathios E. Michaelides
    DOI: 10.1115/1.4004745
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The exhaust gas recirculation (EGR) system has been widely used in the automotive and heavy-duty trucks to reduce NOx , SOx , and other controlled emissions. A liquid-cooled or air-cooled heat exchanger is the main constituent of the EGR system. The heat exchanger decreases the temperature of the exhaust gases mixture that flows through the EGR channels and the lower temperatures reduce the content of the controlled gas emissions. Condensation of water vapor is an undesirable by-product of the EGR systems because, in combination with the emission gases, it forms the corrosive sulfuric and nitric acids. The U.S. EPA has suggested that engine makers should turn off their EGR systems periodically to avoid the formation of the corrosive sulfuric and nitric acids. In order to accurately predict the corrosion process, a condensation model has been developed to investigate the rates of formation and diffusion of nitric acid and sulfuric acid to the cold tube surface. A three-dimensional computational fluid dynamics (CFD) simulation has been conducted for a typical EGR cooler during normal operating conditions of Tier 4 heavy-duty trucks. A lumped, 1D heat and mass transfer model has also been developed to study the most important physical aspects of the condensation process. The CFD and the analytical results of the rate of condensation and local fluid properties are an important and inexpensive complement to more expensive experimental measurements and testing. Such models may be used to improve the design and to optimize the operating conditions of the EGR systems and may become valuable tools in the design and manufacturing of the next generation of EGR systems for diesel engines. The model developed is general and the techniques and numerical results of this study may be extended to engine reliability, corrosion reduction, and damage prevention of other industrial engines.
    keyword(s): Flow (Dynamics) , Condensation , Exhaust systems , Mixtures , Trucks , Exhaust gas recirculation , Gases , Temperature , Vapors AND Water vapor ,
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      Condensation Analysis of Exhaust Gas Recirculation System for Heavy-Duty Trucks

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    http://yetl.yabesh.ir/yetl1/handle/yetl/147620
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    • Journal of Thermal Science and Engineering Applications

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    contributor authorBing-Jian Yang
    contributor authorShaolin Mao
    contributor authorOrhan Altin
    contributor authorZhi-Gang Feng
    contributor authorEfstathios E. Michaelides
    date accessioned2017-05-09T00:46:59Z
    date available2017-05-09T00:46:59Z
    date copyrightDecember, 2011
    date issued2011
    identifier issn1948-5085
    identifier otherJTSEBV-28835#041007_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/147620
    description abstractThe exhaust gas recirculation (EGR) system has been widely used in the automotive and heavy-duty trucks to reduce NOx , SOx , and other controlled emissions. A liquid-cooled or air-cooled heat exchanger is the main constituent of the EGR system. The heat exchanger decreases the temperature of the exhaust gases mixture that flows through the EGR channels and the lower temperatures reduce the content of the controlled gas emissions. Condensation of water vapor is an undesirable by-product of the EGR systems because, in combination with the emission gases, it forms the corrosive sulfuric and nitric acids. The U.S. EPA has suggested that engine makers should turn off their EGR systems periodically to avoid the formation of the corrosive sulfuric and nitric acids. In order to accurately predict the corrosion process, a condensation model has been developed to investigate the rates of formation and diffusion of nitric acid and sulfuric acid to the cold tube surface. A three-dimensional computational fluid dynamics (CFD) simulation has been conducted for a typical EGR cooler during normal operating conditions of Tier 4 heavy-duty trucks. A lumped, 1D heat and mass transfer model has also been developed to study the most important physical aspects of the condensation process. The CFD and the analytical results of the rate of condensation and local fluid properties are an important and inexpensive complement to more expensive experimental measurements and testing. Such models may be used to improve the design and to optimize the operating conditions of the EGR systems and may become valuable tools in the design and manufacturing of the next generation of EGR systems for diesel engines. The model developed is general and the techniques and numerical results of this study may be extended to engine reliability, corrosion reduction, and damage prevention of other industrial engines.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleCondensation Analysis of Exhaust Gas Recirculation System for Heavy-Duty Trucks
    typeJournal Paper
    journal volume3
    journal issue4
    journal titleJournal of Thermal Science and Engineering Applications
    identifier doi10.1115/1.4004745
    journal fristpage41007
    identifier eissn1948-5093
    keywordsFlow (Dynamics)
    keywordsCondensation
    keywordsExhaust systems
    keywordsMixtures
    keywordsTrucks
    keywordsExhaust gas recirculation
    keywordsGases
    keywordsTemperature
    keywordsVapors AND Water vapor
    treeJournal of Thermal Science and Engineering Applications:;2011:;volume( 003 ):;issue: 004
    contenttypeFulltext
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