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    In Situ Thermophysical Properties of an Evolving Carbon Nanoparticle Based Deposit Layer Utilizing a Novel Infrared and Optical Methodology

    Source: Journal of Energy Resources Technology:;2016:;volume( 138 ):;issue: 005::page 52207
    Author:
    Salvi, Ashwin A.
    ,
    Hoard, John
    ,
    Styles, Dan
    ,
    Assanis, Dennis
    DOI: 10.1115/1.4032942
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The use of exhaust gas recirculation (EGR) in internal combustion engines has significant impacts on engine combustion and emissions. EGR can be used to reduce incylinder NOx production, reduce fuel consumption, and enable advanced forms of combustion. To maximize the benefits of EGR, the exhaust gases are often cooled with liquid to gas heat exchangers. However, the build up of a fouling deposit layer from exhaust particulates and volatiles results in the decrease of heat exchanger efficiency, increasing the outlet temperature of the exhaust gases and decreasing the advantages of EGR. This paper presents an experimental data from a novel in situ measurement technique in a visualization rig during the development of a 378 خ¼m thick deposit layer. Measurements were performed every 6 hrs for up to 24 hrs. The results show a nonlinear increase in deposit thickness with an increase in layer surface area as deposition continued. Deposit surface temperature and temperature difference across the thickness of the layer was shown to increase with deposit thickness while heat transfer decreased. The provided measurements combine to produce deposit thermal conductivity. A thorough uncertainty analysis of the in situ technique is presented and suggests higher measurement accuracy at thicker deposit layers and with larger temperature differences across the layer. The interface and wall temperature measurements are identified as the strongest contributors to the measurement uncertainty. Due to instrument uncertainty, the influence of deposit thickness and temperature could not be determined. At an average deposit thickness of 378 خ¼m and at a temperature of 100 آ°C, the deposit thermal conductivity was determined to be 0.044 آ±â€‰0.0062 W/m K at a 90% confidence interval based on instrument accuracy.
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      In Situ Thermophysical Properties of an Evolving Carbon Nanoparticle Based Deposit Layer Utilizing a Novel Infrared and Optical Methodology

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    http://yetl.yabesh.ir/yetl1/handle/yetl/160926
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    contributor authorSalvi, Ashwin A.
    contributor authorHoard, John
    contributor authorStyles, Dan
    contributor authorAssanis, Dennis
    date accessioned2017-05-09T01:27:52Z
    date available2017-05-09T01:27:52Z
    date issued2016
    identifier issn0195-0738
    identifier otherjert_138_05_052207.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/160926
    description abstractThe use of exhaust gas recirculation (EGR) in internal combustion engines has significant impacts on engine combustion and emissions. EGR can be used to reduce incylinder NOx production, reduce fuel consumption, and enable advanced forms of combustion. To maximize the benefits of EGR, the exhaust gases are often cooled with liquid to gas heat exchangers. However, the build up of a fouling deposit layer from exhaust particulates and volatiles results in the decrease of heat exchanger efficiency, increasing the outlet temperature of the exhaust gases and decreasing the advantages of EGR. This paper presents an experimental data from a novel in situ measurement technique in a visualization rig during the development of a 378 خ¼m thick deposit layer. Measurements were performed every 6 hrs for up to 24 hrs. The results show a nonlinear increase in deposit thickness with an increase in layer surface area as deposition continued. Deposit surface temperature and temperature difference across the thickness of the layer was shown to increase with deposit thickness while heat transfer decreased. The provided measurements combine to produce deposit thermal conductivity. A thorough uncertainty analysis of the in situ technique is presented and suggests higher measurement accuracy at thicker deposit layers and with larger temperature differences across the layer. The interface and wall temperature measurements are identified as the strongest contributors to the measurement uncertainty. Due to instrument uncertainty, the influence of deposit thickness and temperature could not be determined. At an average deposit thickness of 378 خ¼m and at a temperature of 100 آ°C, the deposit thermal conductivity was determined to be 0.044 آ±â€‰0.0062 W/m K at a 90% confidence interval based on instrument accuracy.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleIn Situ Thermophysical Properties of an Evolving Carbon Nanoparticle Based Deposit Layer Utilizing a Novel Infrared and Optical Methodology
    typeJournal Paper
    journal volume138
    journal issue5
    journal titleJournal of Energy Resources Technology
    identifier doi10.1115/1.4032942
    journal fristpage52207
    journal lastpage52207
    identifier eissn1528-8994
    treeJournal of Energy Resources Technology:;2016:;volume( 138 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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