Viscoplastic flow between hinged plates

Viscoplastic flow between hinged plates
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铰接板之间的粘塑性流动

DOI:
10.1017/jfm.2023.106
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发表时间:
2023
影响因子:
3.7
通讯作者:
Taylor-West J
Taylor-West J
中科院分区:
工程技术2区
文献类型:
--
作者:
Taylor-West J

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粘塑性流体在两个半无限大刚性板之间的不可压缩运动产生自相似的流场,因为在没有惯性的情况下没有外加的长度尺度。半无限刚性板两端铰接并以恒角速度相互旋转。应变率的大小随板的角速度而变化,无因次偏应力仅是极角的函数,是屈服应力的无量纲测量;它们与到拐角的径向距离无关。这些流动的特点是与边界相邻的未屈服区域,以获得足够大的板块之间的角度。此外,当无因次屈服应力较大时,存在附着在边界或塞体上的粘塑性边界层,并构造了该边界层的渐近结构。
The incompressible motion of viscoplastic fluid between two semi-infinite rigid plates, hinged at their ends and rotating towards one another at constant angular velocity, generates self-similar flow fields because there is no externally imposed length scale in the absence of inertia. The magnitude of the strain rate scales with the angular velocity of the plates and the dimensionless deviatoric stresses are functions only of the polar angle and a dimensionless measure of the yield stress; they are independent of the radial distance from the corner. These flows feature unyielded regions adjacent to the boundaries for sufficiently large angles between the plates. Moreover, when the dimensionless yield stress is large, there are viscoplastic boundary layers that are attached to the boundary or the plug, the asymptotic structures of which are constructed.
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