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首页> 外文期刊>Journal of Non-Newtonian Fluid Mechanics >The instability of non-Newtonian boundary-layer flows over rough rotating disks
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The instability of non-Newtonian boundary-layer flows over rough rotating disks

机译:非牛顿边界层的不稳定性在粗旋转磁盘上流动

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摘要

We are concerned with the local linear convective instability of the incompressible boundary-layer flows over rough rotating disks for non-Newtonian fluids. Using the Carreau model for a range of shear-thinning and shear-thickening fluids, we determine, for the first time, steady-flow profiles under the partial-slip model for surface roughness. The subsequent linear stability analyses of these flows (to disturbances stationary relative to the disk) indicate that isotropic and azimuthally-anisotropic (radial grooves) surface roughness leads to the stabilisation of both shear-thinning and -thickening fluids. This is evident in the behaviour of the critical Reynolds number and growth rates of both Type I (inviscid cross flow) and Type II (viscous streamline curvature) modes of instability. The underlying physical mechanisms are clarified using an integral energy equation.
机译:我们涉及不可压缩边界层的本地线性对流不稳定性,用于非牛顿流体的粗旋转盘。 使用Carreau模型在一系列剪切稀释和剪切增稠流体中,我们首次确定局部粗糙度下的局部滑移模型下的稳压型材。 这些流动的随后的线性稳定性分析(相对于盘静止)表示各向同性和方位角各向异性(径向凹槽)表面粗糙度导致剪切稀释和荧光液的稳定性。 这在I型I(不用交叉流量)和II型(粘性流线曲率)的行为中是显而易见的。 使用积分能量方程阐明底层物理机制。

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