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首页> 外文期刊>International Journal of Heat and Fluid Flow >Large-eddy simulations of heat transfer in asymmetric rib-roughened ducts: Effects of rotation
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Large-eddy simulations of heat transfer in asymmetric rib-roughened ducts: Effects of rotation

机译：大涡模拟在不对称肋粗管中的传热：旋转的影响

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摘要

We report on large-eddy simulations (LES) of the effects of system rotation on heat transfer in a fully-developed flow in an asymmetrically-ribbed rectangular duct at Re = DhU0/v = 15000 where D-h, is the hydraulic diameter and U-0 the bulk flow velocity. The bottom duct wall, ribbed by flow-normal, equally-distanced square-sectioned ribs, was uniformly heated (except for the ribs) with an imposed constant heat flux. The duct was rotated with a spanwise angular velocity Omega corresponding to two rotation number Ro = Omega D-h/U-0 = +/- 0.3, destabilising and stabilising respectively the ribbed-wall adjacent flow. The computational method and the treatment of heat transfer were verified and validated in prior simulations of generic well-documented reference configurations, rotating plane channel and non-ribbed duct flows. The well-resolved LES gave some new insight into the rotation effects on flow and heat transfer, providing information that are not easily accessible to experiments. An attempt is made to identify and distinguish the physical mechanisms of heat transfer enhancement and suppression by system rotation, rib-induced modifications of secondary motion, and the direct effects on the turbulence statistics, especially on the budgets of the turbulent kinetic energy, temperature variance and turbulent heat flux components.
机译：我们报告了系统旋转对传热的影响的大涡模拟（LES），该传热在Re = DhU0 / v = 15000的不对称肋矩形管道中完全展开的流动中进行，其中Dh是水力直径，U- 0总流速。底部管道壁被流动正常，等距的方形截面肋骨肋骨强加，并以恒定的热通量均匀加热（肋骨除外）。管道以与两个旋转数Ro = Omega D-h / U-0 = +/- 0.3对应的翼展方向角速度Omega旋转，分别使肋壁相邻流不稳定和稳定。计算方法和传热的处理方法在先前对通用的，有据可查的参考配置，旋转平面通道和无肋风道流动的模拟中得到了验证和验证。良好解决的LES为旋转对流动和传热的影响提供了一些新见解，提供了实验不易获得的信息。试图通过系统旋转，肋骨引起的二次运动修正，以及对湍流统计的直接影响，尤其是对湍动能预算，温度变化的直接影响，来识别和区分传热增强和抑制的物理机制。和湍流热通量分量。

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