The steady, laminar, incompressible and two dimensional micropolar flow between two porous disks was investigated using optimal homotopy asymptotic method(OHAM) and fourth order Runge–Kutta numerical method. Comparis...The steady, laminar, incompressible and two dimensional micropolar flow between two porous disks was investigated using optimal homotopy asymptotic method(OHAM) and fourth order Runge–Kutta numerical method. Comparison between OHAM and numerical method shows that OHAM is an exact and high efficient method for solving these kinds of problems. The results are presented to study the velocity and rotation profiles for different physical parameters such as Reynolds number, vortex viscosity parameter, spin gradient viscosity and microinertia density parameter. As an important outcome, the magnitude of the microrotation increases with an increase in the values of injection velocity while it decreases by increasing the values of suction velocity.展开更多
首先讨论了不同尺度关系下宏细观过渡方法,然后重点介绍了尺度关系满足L l A≈l_m时(适用于金属基复合材料,泡沫基复合材料和纳米复合材料等),构元材料看作微极介质,而均质化后的材料仍可看作传统Cauchy介质时的解析弹塑性细观力学方法...首先讨论了不同尺度关系下宏细观过渡方法,然后重点介绍了尺度关系满足L l A≈l_m时(适用于金属基复合材料,泡沫基复合材料和纳米复合材料等),构元材料看作微极介质,而均质化后的材料仍可看作传统Cauchy介质时的解析弹塑性细观力学方法。在这样的理论框架下,细观结构的尺度影响可作为变量引入细观力学模型,并且当A l_m时 该方法自然退化成传统的细观力学方法。展开更多
The associations of triblock copolymer made of acrylic acid, methyl acrylic acid and butyl acrylate in aqueous solution as well as in NaCl and CaCl 2 solutions were studied by using fluorescence. The micelle like clus...The associations of triblock copolymer made of acrylic acid, methyl acrylic acid and butyl acrylate in aqueous solution as well as in NaCl and CaCl 2 solutions were studied by using fluorescence. The micelle like clusters(MLCs) of copolymer formed is able to solubilize non polar material. A little electrolytes added in the copolymer solution can increase the value of critical aggregation concentration( ρ ac ) and micropolarity. But with the increase of the concentration of electrolytes, the value of ρ ac and micropolarity will decrease. When there is NaCl with fixed concentration in the systems, the process of the MLCs loosening is relaxed because of the charge screening. In the systems with fixed CaCl 2 concentration, Ca 2+ induced the cross link of -COO - groups, so the interface between the MLCs and the water is not obvious and the big MLCs is formed between the clusters.展开更多
文摘The steady, laminar, incompressible and two dimensional micropolar flow between two porous disks was investigated using optimal homotopy asymptotic method(OHAM) and fourth order Runge–Kutta numerical method. Comparison between OHAM and numerical method shows that OHAM is an exact and high efficient method for solving these kinds of problems. The results are presented to study the velocity and rotation profiles for different physical parameters such as Reynolds number, vortex viscosity parameter, spin gradient viscosity and microinertia density parameter. As an important outcome, the magnitude of the microrotation increases with an increase in the values of injection velocity while it decreases by increasing the values of suction velocity.
文摘首先讨论了不同尺度关系下宏细观过渡方法,然后重点介绍了尺度关系满足L l A≈l_m时(适用于金属基复合材料,泡沫基复合材料和纳米复合材料等),构元材料看作微极介质,而均质化后的材料仍可看作传统Cauchy介质时的解析弹塑性细观力学方法。在这样的理论框架下,细观结构的尺度影响可作为变量引入细观力学模型,并且当A l_m时 该方法自然退化成传统的细观力学方法。
文摘The associations of triblock copolymer made of acrylic acid, methyl acrylic acid and butyl acrylate in aqueous solution as well as in NaCl and CaCl 2 solutions were studied by using fluorescence. The micelle like clusters(MLCs) of copolymer formed is able to solubilize non polar material. A little electrolytes added in the copolymer solution can increase the value of critical aggregation concentration( ρ ac ) and micropolarity. But with the increase of the concentration of electrolytes, the value of ρ ac and micropolarity will decrease. When there is NaCl with fixed concentration in the systems, the process of the MLCs loosening is relaxed because of the charge screening. In the systems with fixed CaCl 2 concentration, Ca 2+ induced the cross link of -COO - groups, so the interface between the MLCs and the water is not obvious and the big MLCs is formed between the clusters.
