The polymer solution for polymer flooding is a viscoelastic fluid. There exist both shear flow and elongational flow when the polymer solution flows in a porous medium, where an additional dissipation is involved. The...The polymer solution for polymer flooding is a viscoelastic fluid. There exist both shear flow and elongational flow when the polymer solution flows in a porous medium, where an additional dissipation is involved. The additional dissipation caused by elongational deformation is often ignored while studying the flow of the fluid in a porous medium. For a complex polymer solution, the generated elongational pressure drop cannot be ignored. In a capillary of fixed diameter, the polymer solution is only impacted by the shear force, and its rheological property is pseudoplastic. Therefore the variable diameter capillary and the converging-diverging flow model with different cross sections are required to describe the flow characteristics of the polymer solution in porous media more accurately. When the polymer solution flows through the port, we have the elongational flow and the polymer molecules undergo elongational deformation elastically. By using the mechanical energy balance principle and the minimum energy principle, a mathematical model of non-Newtonian fluid inlet flow was established by Binding. On the basis of the Binding theory, with the application of the theory of viscoelastic fluid flow in the circular capillary and the contraction-expansion tube, the relations between the viscoelastic fluid flow rate and the pressure drop are obtained.展开更多
Constructing the Chinese self-independent knowledge system of legal science is a great project to adapt Marxist legal science to the Chinese context and the needs of our times in the new era, a profound revolution in ...Constructing the Chinese self-independent knowledge system of legal science is a great project to adapt Marxist legal science to the Chinese context and the needs of our times in the new era, a profound revolution in the field of legal science, a precursor and foundation for constructing a system of legal science with Chinese characteristics, an urgent need to train high-quality legal talents with both virtues and talents, and an inevitable requirement for promoting the Chinese path to the modernization of the rule of law. To carry out such a systematic project, it is imperative to focus on the seven basic principles and scientific methods that include adhering to the ideological guidance of XI Jinping Thought on the Rule of Law. The theory of the system of socialist rule of law with Chinese characteristics, which is the cornerstone for the development of the Chinese self-independent knowledge system of legal science, has provided a necessary and much-needed theoretical paradigm for the development of the Chinese self independent knowledge system of legal science, has led to the innovative development of legal theory with Chinese characteristics in the new era, and will continue to do it.展开更多
基金Project supported by the National Natural Science Foun-dation of China(Grant No.51574085)the Natural Science Founaation of Heilongjiang Province(Grant No.F2015020)the Science and Technology Research Project of Department of Education of Heilongjiang Province(Grant No.12521059)
文摘The polymer solution for polymer flooding is a viscoelastic fluid. There exist both shear flow and elongational flow when the polymer solution flows in a porous medium, where an additional dissipation is involved. The additional dissipation caused by elongational deformation is often ignored while studying the flow of the fluid in a porous medium. For a complex polymer solution, the generated elongational pressure drop cannot be ignored. In a capillary of fixed diameter, the polymer solution is only impacted by the shear force, and its rheological property is pseudoplastic. Therefore the variable diameter capillary and the converging-diverging flow model with different cross sections are required to describe the flow characteristics of the polymer solution in porous media more accurately. When the polymer solution flows through the port, we have the elongational flow and the polymer molecules undergo elongational deformation elastically. By using the mechanical energy balance principle and the minimum energy principle, a mathematical model of non-Newtonian fluid inlet flow was established by Binding. On the basis of the Binding theory, with the application of the theory of viscoelastic fluid flow in the circular capillary and the contraction-expansion tube, the relations between the viscoelastic fluid flow rate and the pressure drop are obtained.
文摘Constructing the Chinese self-independent knowledge system of legal science is a great project to adapt Marxist legal science to the Chinese context and the needs of our times in the new era, a profound revolution in the field of legal science, a precursor and foundation for constructing a system of legal science with Chinese characteristics, an urgent need to train high-quality legal talents with both virtues and talents, and an inevitable requirement for promoting the Chinese path to the modernization of the rule of law. To carry out such a systematic project, it is imperative to focus on the seven basic principles and scientific methods that include adhering to the ideological guidance of XI Jinping Thought on the Rule of Law. The theory of the system of socialist rule of law with Chinese characteristics, which is the cornerstone for the development of the Chinese self-independent knowledge system of legal science, has provided a necessary and much-needed theoretical paradigm for the development of the Chinese self independent knowledge system of legal science, has led to the innovative development of legal theory with Chinese characteristics in the new era, and will continue to do it.
