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    Flow and Heat Transfer Characteristics in the Entry and Stabilized Flow Regions of a Circular Channel Rotating About a Parallel Axis

    Source: Journal of Thermal Science and Engineering Applications:;2024:;volume( 016 ):;issue: 007::page 71011-1
    Author:
    Ananth Narayan, S.
    ,
    Abraham, Satyanand
    DOI: 10.1115/1.4065282
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Cooling of heavy-duty electrical machines such as generators and motors is crucial for the smooth operations without thermal runaway. A commonly employed technique for the cooling of rotors in these machines is to place channels at different radial locations for the continuous passage of coolant. These channels are therefore rotating about a parallel axis, and the rotation-induced forces alter the flow and thermal behavior of the coolant compared to stationary channels. The present study reports a detailed numerical investigation on a long circular channel rotating about a parallel axis. The objective is to analyze the flow, heat transfer, and rotation-induced forces (Coriolis and centrifugal forces) in the entry region as well as in the region where flow is stable (the term ‘stable’ is used rather than ‘developed’ due to the presence of secondary flows in this region). The rotating channel was subjected to constant wall heat flux and constant wall temperature conditions at different Rotation numbers of 0, 0.15, 0.4, and 0.6. The Coriolis force is observed to be strong enough in the entry region to influence the flow. In the “stable flow” region, the centrifugal force becomes more dominant and forms counter-rotating secondary vortex pair, which causes circumferential variation in the Nusselt number. The flow and heat transfer characteristics for constant wall heat flux and wall temperature boundaries are the same for rotation conditions with similar values of rotational Grashof number. A correlation is presented for the circumferential variation of the Nusselt number in the stable flow region.
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      Flow and Heat Transfer Characteristics in the Entry and Stabilized Flow Regions of a Circular Channel Rotating About a Parallel Axis

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4302599
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    contributor authorAnanth Narayan, S.
    contributor authorAbraham, Satyanand
    date accessioned2024-12-24T18:42:32Z
    date available2024-12-24T18:42:32Z
    date copyright5/21/2024 12:00:00 AM
    date issued2024
    identifier issn1948-5085
    identifier othertsea_16_7_071011.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4302599
    description abstractCooling of heavy-duty electrical machines such as generators and motors is crucial for the smooth operations without thermal runaway. A commonly employed technique for the cooling of rotors in these machines is to place channels at different radial locations for the continuous passage of coolant. These channels are therefore rotating about a parallel axis, and the rotation-induced forces alter the flow and thermal behavior of the coolant compared to stationary channels. The present study reports a detailed numerical investigation on a long circular channel rotating about a parallel axis. The objective is to analyze the flow, heat transfer, and rotation-induced forces (Coriolis and centrifugal forces) in the entry region as well as in the region where flow is stable (the term ‘stable’ is used rather than ‘developed’ due to the presence of secondary flows in this region). The rotating channel was subjected to constant wall heat flux and constant wall temperature conditions at different Rotation numbers of 0, 0.15, 0.4, and 0.6. The Coriolis force is observed to be strong enough in the entry region to influence the flow. In the “stable flow” region, the centrifugal force becomes more dominant and forms counter-rotating secondary vortex pair, which causes circumferential variation in the Nusselt number. The flow and heat transfer characteristics for constant wall heat flux and wall temperature boundaries are the same for rotation conditions with similar values of rotational Grashof number. A correlation is presented for the circumferential variation of the Nusselt number in the stable flow region.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFlow and Heat Transfer Characteristics in the Entry and Stabilized Flow Regions of a Circular Channel Rotating About a Parallel Axis
    typeJournal Paper
    journal volume16
    journal issue7
    journal titleJournal of Thermal Science and Engineering Applications
    identifier doi10.1115/1.4065282
    journal fristpage71011-1
    journal lastpage71011-16
    page16
    treeJournal of Thermal Science and Engineering Applications:;2024:;volume( 016 ):;issue: 007
    contenttypeFulltext
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