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    A Model of the Enhancement of Coal Combustion Using High-Intensity Acoustic Fields

    Source: Journal of Energy Resources Technology:;1991:;volume( 113 ):;issue: 004::page 277
    Author:
    S. Yavuzkurt
    ,
    M. Y. Ha
    ,
    G. Koopmann
    ,
    A. W. Scaroni
    DOI: 10.1115/1.2905912
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A model for the enhancement of coal combustion in the presence of high-intensity acoustic fields has been developed. A high-intensity acoustic field induces an oscillating velocity over pulverized coal particles otherwise entrained in the main gas stream, resulting in increased heat and mass transfer. The augmented heat and mass transfer coefficients, expressed as space and time-averaged Nusselt and Sherwood numbers for the oscillating flow, were implemented in an existing computer code (PCGC-2) capable of predicting various aspects of pulverized coal combustion and gasification. Increases in the Nusselt and Sherwood numbers about 45, 60 and 82.5 percent at sound pressure levels of 160, 165 and 170 dB for 100-μm coal particles were obtained due to increase in the acoustic slip velocity associated with the increased sound pressure levels. The main effect of the acoustic field was observed during the char combustion phase in a diffusionally controlled situation. A decrease in the char burn-out length (time) of 15.7 percent at 160 dB and 30.2 percent at 170 dB was obtained compared to the case with no sound for the 100-μm coal particles.
    keyword(s): Combustion , Acoustics , Coal , Particulate matter , Heat , Mass transfer , Sound pressure , Flow (Dynamics) , Sound , Computers AND Fuel gasification ,
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      A Model of the Enhancement of Coal Combustion Using High-Intensity Acoustic Fields

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/108435
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    • Journal of Energy Resources Technology

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    contributor authorS. Yavuzkurt
    contributor authorM. Y. Ha
    contributor authorG. Koopmann
    contributor authorA. W. Scaroni
    date accessioned2017-05-08T23:35:21Z
    date available2017-05-08T23:35:21Z
    date copyrightDecember, 1991
    date issued1991
    identifier issn0195-0738
    identifier otherJERTD2-26440#277_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/108435
    description abstractA model for the enhancement of coal combustion in the presence of high-intensity acoustic fields has been developed. A high-intensity acoustic field induces an oscillating velocity over pulverized coal particles otherwise entrained in the main gas stream, resulting in increased heat and mass transfer. The augmented heat and mass transfer coefficients, expressed as space and time-averaged Nusselt and Sherwood numbers for the oscillating flow, were implemented in an existing computer code (PCGC-2) capable of predicting various aspects of pulverized coal combustion and gasification. Increases in the Nusselt and Sherwood numbers about 45, 60 and 82.5 percent at sound pressure levels of 160, 165 and 170 dB for 100-μm coal particles were obtained due to increase in the acoustic slip velocity associated with the increased sound pressure levels. The main effect of the acoustic field was observed during the char combustion phase in a diffusionally controlled situation. A decrease in the char burn-out length (time) of 15.7 percent at 160 dB and 30.2 percent at 170 dB was obtained compared to the case with no sound for the 100-μm coal particles.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Model of the Enhancement of Coal Combustion Using High-Intensity Acoustic Fields
    typeJournal Paper
    journal volume113
    journal issue4
    journal titleJournal of Energy Resources Technology
    identifier doi10.1115/1.2905912
    journal fristpage277
    journal lastpage285
    identifier eissn1528-8994
    keywordsCombustion
    keywordsAcoustics
    keywordsCoal
    keywordsParticulate matter
    keywordsHeat
    keywordsMass transfer
    keywordsSound pressure
    keywordsFlow (Dynamics)
    keywordsSound
    keywordsComputers AND Fuel gasification
    treeJournal of Energy Resources Technology:;1991:;volume( 113 ):;issue: 004
    contenttypeFulltext
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