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    Effects of Flow Pulsation and Surface Geometry on Heat Transfer Performance in a Channel With Teardrop-Shaped Dimples Measured by Transient Technique

    Source: ASME Journal of Heat and Mass Transfer:;2024:;volume( 146 ):;issue: 007::page 72001-1
    Author:
    Kobayashi, Shimpei
    ,
    Inokuma, Kento
    ,
    Murata, Akira
    ,
    Iwamoto, Kaoru
    DOI: 10.1115/1.4065117
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This study focuses on the heat transfer performance of a pulsating flow over a channel surface with teardrop-shaped dimples. Heat transfer measurements were performed by a transient technique with compensation of three-dimensional heat conduction under a bulk Reynolds number of 25,000. Seven types of surfaces with the teardrop-shaped dimples were examined, where dimple arrangement (in-line/staggered) and inclination angle (0–60 deg) were varied. A pulsating flow with the Strouhal number of 0.15 was generated by vibrating a rubber film section on the channel wall using a vibration generator. The pulsation amplitude was evaluated by calculating the root-mean-square value of the phase averaged velocity. Two conditions of the pulsation amplitudes were examined (0.09 and 0.12 of mean velocity). The results showed that the surface-averaged Nusselt number and friction factor for the pulsating flow increased from those for the steady flow. The highest increases of the surface-averaged Nusselt number and heat transfer efficiency index appeared in the 30 deg in-line arrangement, and those were 16.1% and 9.8%, respectively, at most as compared with the steady case. Due to the flow pulsation, the local Nusselt number was enhanced at the leading-edge region of the dimples, and supplementary Reynolds averaged Navier–Stokes (RANS)/unsteady RANS (URANS) results showed that the flow separation size was shrunk by the flow pulsation there.
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      Effects of Flow Pulsation and Surface Geometry on Heat Transfer Performance in a Channel With Teardrop-Shaped Dimples Measured by Transient Technique

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    contributor authorKobayashi, Shimpei
    contributor authorInokuma, Kento
    contributor authorMurata, Akira
    contributor authorIwamoto, Kaoru
    date accessioned2024-12-24T18:57:52Z
    date available2024-12-24T18:57:52Z
    date copyright4/17/2024 12:00:00 AM
    date issued2024
    identifier issn2832-8450
    identifier otherht_146_07_072001.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4303058
    description abstractThis study focuses on the heat transfer performance of a pulsating flow over a channel surface with teardrop-shaped dimples. Heat transfer measurements were performed by a transient technique with compensation of three-dimensional heat conduction under a bulk Reynolds number of 25,000. Seven types of surfaces with the teardrop-shaped dimples were examined, where dimple arrangement (in-line/staggered) and inclination angle (0–60 deg) were varied. A pulsating flow with the Strouhal number of 0.15 was generated by vibrating a rubber film section on the channel wall using a vibration generator. The pulsation amplitude was evaluated by calculating the root-mean-square value of the phase averaged velocity. Two conditions of the pulsation amplitudes were examined (0.09 and 0.12 of mean velocity). The results showed that the surface-averaged Nusselt number and friction factor for the pulsating flow increased from those for the steady flow. The highest increases of the surface-averaged Nusselt number and heat transfer efficiency index appeared in the 30 deg in-line arrangement, and those were 16.1% and 9.8%, respectively, at most as compared with the steady case. Due to the flow pulsation, the local Nusselt number was enhanced at the leading-edge region of the dimples, and supplementary Reynolds averaged Navier–Stokes (RANS)/unsteady RANS (URANS) results showed that the flow separation size was shrunk by the flow pulsation there.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleEffects of Flow Pulsation and Surface Geometry on Heat Transfer Performance in a Channel With Teardrop-Shaped Dimples Measured by Transient Technique
    typeJournal Paper
    journal volume146
    journal issue7
    journal titleASME Journal of Heat and Mass Transfer
    identifier doi10.1115/1.4065117
    journal fristpage72001-1
    journal lastpage72001-8
    page8
    treeASME Journal of Heat and Mass Transfer:;2024:;volume( 146 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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