Finite‐Element Simulation of Laminar Viscoplastic Flows with Regions of Recirculation
Finite‐Element Simulation of Laminar Viscoplastic Flows with Regions of Recirculation
复制标题
DOI：
10.1122/1.549976
复制
发表时间：
1988-05
影响因子：
3.3
通讯作者：
P. Scott;F. Mirza;J. Vlachopoulos
中科院分区：
文献类型：
--
作者：
P. Scott;F. Mirza;J. Vlachopoulos
用有限元方法求解了含回流涡流系统中粘塑性材料的低雷诺数稳态流动。对于Bingham和Casson材料，平面和轴对称突变膨胀中的再附着长度和涡流强度与雷诺数和无量纲屈服应力相关。使用牛顿本构关系和卡森本构关系研究了狭窄中的流动。比较了Bingham流体和牛顿流体在180度平面直管和弯管中的分离区。结果表明，粘塑性材料的回流尺寸减小，回流强度减小。
Solutions are obtained for steady‐state low Reynolds number flow of viscoplastic materials in systems with recirculating eddies using the finite‐element method. The reattachment length and eddy intensity in planar and axisymmetric abrupt expansions are correlated with Reynolds number and dimensionless yield stress for Bingham and Casson materials. Flow in a stenosis is examined using Newtonian and Casson constitutive relationships. The separation zones in a 180 degree planar bifurcation with straight and bent inlets are compared for Bingham and Newtonian fluids. The results show that the size and strength of recirculation is reduced for viscoplastic materials.