Non-Newtonian behaviour of simple liquids |
| |
| Institution: | 1. Institute of Research and Development, Duy Tan University, 03 Quang Trung, Danang, Viet Nam;2. VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam;3. Faculty of Energy, Thuyloi University, 175 Tay Son, Dong Da, Hanoi, Viet Nam;4. Tan Trao University, Tuyen Quang, Viet Nam;5. Hong Duc University, Thanh Hoa, Viet Nam;6. Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;7. Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;1. Institute of Metallurgy of Ural Branch of Russian Academy of Science, 101 Amundsen st., 620016, Ekaterinburg, Russia;2. Ural Federal University named after First President of Russia B.N. Yeltsin, 19 Mira st., 620002, Ekaterinburg, Russia;3. L.D. Landau Institute for Theoretical Physics of Russian Academy of Sciences, 1-A Akademika Semenova av., 142432, Moscow Region, Chernogolovka, Russia;1. Institute for Computational Physics, University of Stuttgart, Allmandring 3, Germany;2. Chemnitz University of Technology, Faculty of Mathematics, 09107 Chemnitz, Germany |
| |
| Abstract: | A new method is presented for determining essentially exact non-Newtonian behaviour of simple liquids such as liquid argon, chlorine and water, whose molecules can be roughly represented by spherically averaged Lennard-Jones pair potentials. The technique of Non-Equilibrium Molecular Dynamics, NEMD, shows that even these simple liquids shear thin, have a second-Newtonian region and shear thicken. These phenomena have been associated in the past with complex mechanisms and structures. The appearance of these effects in such simple systems demands a re-evaluation of the former approaches. As with experimental techniques the viscosities were most accurately obtained only within a certain shear rate range. As a result, literature analytical fits were sought for the data. The Carreau and Cross models fit the simple liquids' shear thinning curves at densities slightly below the normal freezing density whereas a Herschel-Bulkley expression was found most suitable at densities in excess of 15% of this. Extreme shear thinning behaviour is associated with the creation of long range order within the liquid. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
