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    Sensitivity of Heat Transfer to the Cross Section Geometry of Cylinders

    Source: ASME Journal of Heat and Mass Transfer:;2025:;volume( 147 ):;issue: 004::page 41802-1
    Author:
    Sambu, Mathan
    ,
    Derakhshandeh, Javad Farrokhi
    ,
    Zaman, Izzuddin
    DOI: 10.1115/1.4067421
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This study investigates the phenomenon of vortex shedding and the heat transfer performance of bluff bodies, including smooth and sharp-edged cylinders. The examined geometries include square, triangular, hexagonal, and bullet-shaped bodies. The results are compared with a smooth circular cylinder standardizing the hydraulic diameter (Dh) across all bluff bodies and maintaining a Reynolds number within the range of 100 ⩽ Re ⩽ 200. The thermofluidic results are carefully examined and compared to determine the optimal conditions for maximum heat transfer rates, as measured by the Nusselt number. It is found that the Strouhal number, and thus the vortex shedding frequency, of cylinders with smooth surfaces differs significantly from those with sharp edges. It is demonstrated that hexagonal cylinders have up to 33% higher St than other geometries. Due to the flow dynamics in the wake of the cylinders, the heat transfer rates are lowest in square geometry and highest in circular geometry. Based on the analysis, bluff bodies can be classified into two primary groups: (i) bluff bodies with up to four edges are classified as “nonsmooth bluff bodies,” and (ii) those with six or more edges behave similarly to “smooth surface cylinders.”
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      Sensitivity of Heat Transfer to the Cross Section Geometry of Cylinders

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    contributor authorSambu, Mathan
    contributor authorDerakhshandeh, Javad Farrokhi
    contributor authorZaman, Izzuddin
    date accessioned2025-04-21T10:07:21Z
    date available2025-04-21T10:07:21Z
    date copyright1/17/2025 12:00:00 AM
    date issued2025
    identifier issn2832-8450
    identifier otherht_147_04_041802.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4305540
    description abstractThis study investigates the phenomenon of vortex shedding and the heat transfer performance of bluff bodies, including smooth and sharp-edged cylinders. The examined geometries include square, triangular, hexagonal, and bullet-shaped bodies. The results are compared with a smooth circular cylinder standardizing the hydraulic diameter (Dh) across all bluff bodies and maintaining a Reynolds number within the range of 100 ⩽ Re ⩽ 200. The thermofluidic results are carefully examined and compared to determine the optimal conditions for maximum heat transfer rates, as measured by the Nusselt number. It is found that the Strouhal number, and thus the vortex shedding frequency, of cylinders with smooth surfaces differs significantly from those with sharp edges. It is demonstrated that hexagonal cylinders have up to 33% higher St than other geometries. Due to the flow dynamics in the wake of the cylinders, the heat transfer rates are lowest in square geometry and highest in circular geometry. Based on the analysis, bluff bodies can be classified into two primary groups: (i) bluff bodies with up to four edges are classified as “nonsmooth bluff bodies,” and (ii) those with six or more edges behave similarly to “smooth surface cylinders.”
    publisherThe American Society of Mechanical Engineers (ASME)
    titleSensitivity of Heat Transfer to the Cross Section Geometry of Cylinders
    typeJournal Paper
    journal volume147
    journal issue4
    journal titleASME Journal of Heat and Mass Transfer
    identifier doi10.1115/1.4067421
    journal fristpage41802-1
    journal lastpage41802-16
    page16
    treeASME Journal of Heat and Mass Transfer:;2025:;volume( 147 ):;issue: 004
    contenttypeFulltext
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