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Archive > Volume Issue 5 > 2023(5):522-533. DOI:10.16356/j.1005-1120.2023.05.002 Prev Next

Numerical Study on Flow and Heat Transfer Characteristics Inside Rotating Rib-Roughened Pipe with Axial Throughflow

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    Abstract:
    A numerical study was performed on the flow and heat transfer characteristics inside a rotating rib-roughened pipe with an axial throughflow， under a fixed axial throughflow Reynolds number Rex 6 400 and a series of rotational Reynolds number Reω ranging from 0 to 3.77×104. Three rib configurations were taken into consideration， including ring rib， discrete-ring rib and longitudinal rib， wherein the ring-type ribs were distributed along the axial direction and the longitudinal-type ribs were distributed along the circumferential direction. The results show that the flow field inside a rotating pipe is affected by both axial through flow and rotation-induced azimuthal flow. Under small rotational Reynolds numbers， the axial through flow is dominant such that the ring-type rib plays significant heat transfer enhancement role. Whereas under high rotational Reynolds numbers， the rotation-induced azimuthal flow is dominant such that the longitudinal-type rib is superior to the ring-type rib on heat transfer enhancement. In the view of a comprehensive performance factor that considers both heat transfer enhancement and flow loss together， the discrete-ring rib is identified to be the best among the current three rib configurations under small rotational Reynolds numbers. However， under high rotational Reynolds numbers， the ring-type ribs show no advantage over smooth pipe， and even lead to a reduction in comprehensive performance when compared to the smooth pipe. For the high-speed rotating pipe， the longitudinal-type rib is a promising rib configuration as applied to the heat transfer enhancement.

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    V231.1

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