期刊
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
卷 165, 期 7-8, 页码 435-440出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnnfm.2010.01.026
关键词
Non-Newtonian; Microchannel; Electroviscous effect; Lattice Boltzmann method
类别
资金
- National Natural Science Foundation of China [50776067]
- Program for New Century Excellent Talents in University of China [NCET-07-0676]
Understanding non-Newtonian flow in microchannels is of both fundamental and practical significance for various microfluidic devices. A numerical study of non-Newtonian flow in microchannels combined with electroviscous effect has been conducted. The electric potential in the electroviscous force term is calculated by solving a lattice Boltzmann equation. And another lattice Boltzmann equation without derivations of the velocity when calculating the shear is employed to obtain flow field. The simulation of commonly used power-law non-Newtonian flow shows that the electroviscous effect on the flow depends significantly on the fluid rheological behavior. For the shear thinning fluid of the power-law exponent n < 1, the fluid viscosity near the wall is smaller and the electroviscous effect plays a more important role. And its effect on the flow increases as the ratio of the Debye length to the channel height increases and the exponent n decreases. While the shear thickening fluid of n > 1 is less affected by the electroviscous force, it can be neglected in practical applications. (C) 2010 Elsevier B.V. All rights reserved.
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