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首页> 外文期刊>Advances in Mechanical Engineering >Friction factor of annular Poiseuille flow in a transitional regime:
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Friction factor of annular Poiseuille flow in a transitional regime:

机译：在过渡状态下环形泊瓦流的摩擦系数：

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Annular Poiseuille flows in a transitional regime were investigated by direct numerical simulations with an emphasis on turbulent statistics including the friction factor that are affected by the presence of large-scale transitional structures. Five different radius ratios in the range of 0.1–0.8 and several friction Reynolds numbers in the range of 48–150 were analyzed to consider various flow states accompanied by characteristic transitional structures. Three characteristic structures, namely, turbulent–laminar coexistence referred to as “(straight) puff,”“helical puff,” and “helical turbulence” were observed. The selection of the structures depends on both the radius ratio and the Reynolds number. The findings indicated that despite the transitional state with a turbulent–laminar coexistence, the helical turbulence resulted in a friction factor that was as high as the fully turbulent value. In contrast, with respect to the occurrence of streamwise-finite transitional structures, such as straight/helica...
机译：通过直接数值模拟研究了过渡状态下的环形泊瓦流动，重点是湍流统计，包括受大型过渡结构的存在影响的摩擦系数。分析了五个不同的半径比（范围为0.1-0.8）和几个摩擦雷诺数（范围为48-150），以考虑各种流动状态以及特征性的过渡结构。观察到了三个特征结构，即湍流-层流共存，称为“（直线）粉扑”，“螺旋粉扑”和“螺旋湍流”。结构的选择取决于半径比和雷诺数。研究结果表明，尽管过渡态具有湍流-层流共存，但螺旋湍流产生的摩擦系数却高达完全湍流值。相反，关于流向有限的过渡结构的出现，例如直线/螺旋...

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