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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal transients in a U-bend
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Thermal transients in a U-bend

机译：U形弯的热瞬变

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摘要

We study numerically the propagation of a hot thermal transient through a U-bend via an ensemble of wall-resolved large eddy simulations. Conjugate heat transfer between fluid and solid domains is accounted for. The flow is in a fully turbulent mixed convection regime, with a bulk Reynolds number of 10,000, a Richardson number of 2.23, and water as the working fluid (Prandtl number = 6). These conditions lead to strong thermal stratification, with buoyancy-induced secondary flows, and the generation of a large and persistent recirculation region. The evolution of Dean vortices as the thermal transient passes is studied. It is found that baroclinic vor-ticity generation dominates over a large period of the transient, due to the thermal inertia of the wall. Gravitational buoyancy leads to a reversal of the counter-rotating vortex pair. The impact of this reversal on the swirl-switching and secondary-current losses is assessed. It is found that low frequency modes are suppressed in the reversed-vortex state.
机译：我们通过壁分辨的大型涡流模拟来数量地研究了热热瞬态通过U形弯曲的传播。占流体和固体域之间的共轭热传递。该流动处于完全湍流的混合对流状态，具有10,000的散装雷诺数，Richardson数量为2.23，以及作为工作流体的水（Prandtl Number = 6）。这些条件导致具有强烈的热分层，具有浮力诱导的二次流动以及产生大而持久的再循环区域的产生。研究了Dean Vortices作为热瞬态通行证的演变。结果发现，由于墙壁的热惯性，曲金vor-ticity一代主要在瞬态的大瞬时进行主导。引力浮力导致反向旋转涡旋对的逆转。评估该逆转对旋流和二次电流损耗的影响。发现在反向涡旋状态下抑制了低频模式。

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