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    Heat Transfer Modulation by Inertial Particles in Particle-Laden Turbulent Channel Flow

    Source: Journal of Heat Transfer:;2018:;volume( 140 ):;issue: 011::page 112003
    Author:
    Liu, Caixi
    ,
    Tang, Shuai
    ,
    Dong, Yuhong
    ,
    Shen, Lian
    DOI: 10.1115/1.4040347
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: We study the effects of particle-turbulence interactions on heat transfer in a particle-laden turbulent channel flow using an Eulerian–Lagrangian simulation approach, with direct numerical simulation (DNS) for turbulence and Lagrangian tracking for particles. A two-way coupling model is employed in which the momentum and energy exchange between the discrete particles and the continuous fluid phase is fully taken into account. Our study focuses on the modulations of the temperature field and heat transfer process by inertial particles with different particle momentum Stokes numbers (St), which in a combination of the particle-to-fluid specific heat ratio and the Prandtl number results in different particle heat Stokes numbers. It is found that as St increases, while the turbulent heat flux decreases due to the suppression of wall-normal turbulence velocity fluctuation, the particle feedback heat flux increases significantly and results in an increase in the total heat flux. The particle thermal feedback effect is illustrated using the instantaneous structures and statistics of the flow and temperature fields. The mechanisms of heat transfer modulation by inertial particles are investigated in detail. The budget of turbulent heat flux is examined. Moreover, by taking advantage of the ability of numerical simulation to address different momentum and heat processes separately, we investigate in detail the two processes of particles affecting heat transfer for the first time, namely the direct effect of particle thermal feedback to the fluid (i.e., heat feedback) and the indirect effect of the modulation of turbulent velocity field induced by the particles (i.e., momentum feedback). It is found that the contribution of heat transfer from turbulent convection is reduced by both heat and momentum feedback due to the decrease of the turbulent heat flux. The contribution of heat transfer from particle transport effects is barely influenced by the momentum feedback, even if St is large and is mainly affected by the heat feedback. Our results indicate that both heat and momentum feedback are important when the particle inertia is large, suggesting that both feedback processes need to be taken into account in computation and modeling.
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      Heat Transfer Modulation by Inertial Particles in Particle-Laden Turbulent Channel Flow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4251781
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    contributor authorLiu, Caixi
    contributor authorTang, Shuai
    contributor authorDong, Yuhong
    contributor authorShen, Lian
    date accessioned2019-02-28T11:01:09Z
    date available2019-02-28T11:01:09Z
    date copyright8/3/2018 12:00:00 AM
    date issued2018
    identifier issn0022-1481
    identifier otherht_140_11_112003.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4251781
    description abstractWe study the effects of particle-turbulence interactions on heat transfer in a particle-laden turbulent channel flow using an Eulerian–Lagrangian simulation approach, with direct numerical simulation (DNS) for turbulence and Lagrangian tracking for particles. A two-way coupling model is employed in which the momentum and energy exchange between the discrete particles and the continuous fluid phase is fully taken into account. Our study focuses on the modulations of the temperature field and heat transfer process by inertial particles with different particle momentum Stokes numbers (St), which in a combination of the particle-to-fluid specific heat ratio and the Prandtl number results in different particle heat Stokes numbers. It is found that as St increases, while the turbulent heat flux decreases due to the suppression of wall-normal turbulence velocity fluctuation, the particle feedback heat flux increases significantly and results in an increase in the total heat flux. The particle thermal feedback effect is illustrated using the instantaneous structures and statistics of the flow and temperature fields. The mechanisms of heat transfer modulation by inertial particles are investigated in detail. The budget of turbulent heat flux is examined. Moreover, by taking advantage of the ability of numerical simulation to address different momentum and heat processes separately, we investigate in detail the two processes of particles affecting heat transfer for the first time, namely the direct effect of particle thermal feedback to the fluid (i.e., heat feedback) and the indirect effect of the modulation of turbulent velocity field induced by the particles (i.e., momentum feedback). It is found that the contribution of heat transfer from turbulent convection is reduced by both heat and momentum feedback due to the decrease of the turbulent heat flux. The contribution of heat transfer from particle transport effects is barely influenced by the momentum feedback, even if St is large and is mainly affected by the heat feedback. Our results indicate that both heat and momentum feedback are important when the particle inertia is large, suggesting that both feedback processes need to be taken into account in computation and modeling.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleHeat Transfer Modulation by Inertial Particles in Particle-Laden Turbulent Channel Flow
    typeJournal Paper
    journal volume140
    journal issue11
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4040347
    journal fristpage112003
    journal lastpage112003-16
    treeJournal of Heat Transfer:;2018:;volume( 140 ):;issue: 011
    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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