NON-NEWTONIAN FLOW IN MICROCHANNELS

2014 ◽  
Vol 34 ◽  
pp. 1460385
Author(s):  
GUIHUA TANG ◽  
YINBIN LU ◽  
YU SHI
Keyword(s):  
Newtonian Fluid ◽  
Lattice Boltzmann ◽  
Electroosmotic Flow ◽  
Practical Significance ◽  
Rheological Characteristics ◽  
Newtonian Flow ◽  
Fundamental Interest ◽  
Electroviscous Effect ◽  
Boltzmann Method ◽  
Pressure Driven Flow

Investigation on Non-Newtonian fluid flow in microchannels is of both fundamental interest and practical significance. The electroosmotic flow under the external electric field and pressure driven flow considering the electroviscous effect for non-Newtonian fluid in microchannels and microscale porous media are numerically studied by using the lattice Boltzmann method. The coupled effects of non-Newtonian rheological characteristics with the microscale electrokinetics are examined and interesting results are obtained.

SIMULATION OF NEWTONIAN AND NON-NEWTONIAN AXISYMMETRIC FLOW WITH AN AXISYMMETRIC LATTICE BOLTZMANN MODEL

2010 ◽  
Vol 21 (10) ◽  
pp. 1237-1254 ◽  
Author(s):  
X. F. LI ◽  
G. H. TANG ◽  
T. Y. GAO ◽  
W. Q. TAO
Keyword(s):  
Poiseuille Flow ◽  
Lattice Boltzmann ◽  
Axisymmetric Flow ◽  
Lattice Boltzmann Model ◽  
Practical Significance ◽  
Newtonian Flow ◽  
Fundamental Interest ◽  
Circular Pipes ◽  
Boltzmann Method ◽  
Boltzmann Model

Axisymmetric flow is of both fundamental interest and practical significance. A recently derived axisymmetric lattice Boltzmann model [J. G. Zhou, Phys. Rev. E78, 036701 (2008)] is adopted for studying several typical axisymmetric flows. First, the Hagen–Poiseuille flow in circular pipes is validated and the Poiseuille flow in annular cylinders is studied under different values of the radius ratio. Second, pulsatile flow in an axisymmetric pipe with a sinusoidal pressure gradient is conducted. Third, flows through pipes with various constrictions or expansions are discussed. Finally, we extend the axisymmetric lattice Boltzmann method for non-Newtonian flow. It is found that the obtained numerical results agree well with available analytical solutions. It is also observed that constriction or expansion in a pipe influences the velocity distribution of the flow significantly. In addition, the results demonstrate that the modified axisymmetric lattice Boltzmann model is capable of handling non-Newtonian flow.

Simulation of High Knudsen Number Gas Flows in Nanochannels via the Lattice Boltzmann Method

2011 ◽  
Vol 403-408 ◽  
pp. 5318-5323
Author(s):  
A.H. Meghdadi Isfahani ◽  
A. Soleimani ◽  
A. Homayoon
Keyword(s):  
Lattice Boltzmann Method ◽  
Knudsen Number ◽  
Lattice Boltzmann ◽  
Numerical Data ◽  
Gas Flows ◽  
Wide Range ◽  
Flow Through ◽  
Boltzmann Method ◽  
Slip Transition ◽  
Pressure Driven Flow

Using a modified Lattice Boltzmann Method (LBM), pressure driven flow through micro and nano channels has been modeled. Based on the improving of the dynamic viscosity, an effective relaxation time formulation is proposed which is able to simulate wide range of Knudsen number, Kn, covering the slip, transition and to some extend the free molecular regimes. The results agree very well with exiting empirical and numerical data.

Lattice Boltzmann Simulation of Droplet Formation in Non-Newtonian Fluids

2015 ◽  
Vol 17 (4) ◽  
pp. 1056-1072 ◽  
Author(s):  
Y. Shi ◽  
G. H. Tang
Keyword(s):  
Newtonian Fluid ◽  
Power Law ◽  
Lattice Boltzmann ◽  
Droplet Formation ◽  
Continuous Phase ◽  
Droplet Generation ◽  
Bgk Model ◽  
Lattice Boltzmann Simulation ◽  
Power Law Exponent ◽  
Boltzmann Method

AbstractNewtonian and non-Newtonian dispersed phase droplet formation in non-Newtonian continuous phase in T-junction and cross junction microchannels are investigated by the immiscible lattice BGK model. The effects of the non-Newtonian fluid power-law exponent, viscosity and interfacial tension on the generation of the droplet are studied. The final droplet size, droplet generation frequency, and detachment point of the droplet change with the power-law exponent. The results reveal that it is necessary to take into account the non-Newtonian rheology instead of simple Newtonian fluid assumption in numerical simulations. The present analysis also demonstrates that the lattice Boltzmann method is of potential to investigate the non-Newtonian droplet generation in multiphase flow.

Non-Newtonian Flow Simulation in Microscale Porous Media with the Lattice Boltzmann Method

2011 ◽  
Author(s):  
G. H. Tang ◽  
P. X. Ye ◽  
C. Bi ◽  
S. B. Wang ◽  
Jiachun Li ◽  
...  
Keyword(s):  
Porous Media ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Flow Simulation ◽  
Newtonian Flow ◽  
Boltzmann Method

scholarly journals An Improved Multi-Relaxation Time Lattice Boltzmann Method for the Non-Newtonian Influence of the Yielding Fluid Flow in Cement-3D Printing

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2342 ◽  
Author(s):  
Tiancheng Huang ◽  
Hai Gu ◽  
Jie Zhang ◽  
Bin Li ◽  
Jianhua Sun ◽  
...  
Keyword(s):  
Relaxation Time ◽  
3D Printing ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Complex Flow ◽  
Excellent Performance ◽  
Newtonian Flow ◽  
Specific Behavior ◽  
Special Flow ◽  
Boltzmann Method

The multi-relaxation time lattice Boltzmann method (MRT-LBM) has an excellent performance in dealing with the complex flow in many different areas. According to the specific behavior of the fluids, it also has some shortcomings when applied to some special flow like as the non-Newtonian flow. In Cement-3D printing, the fluids always exhibit according to the yielding behavior. When using the standard MRT-LBM, the simulation maybe divergent. In order to solve the problem, this work presents an improved MRT-LBM considering the non-Newtonian effect as a special forcing term to ensure the stable and accurate simulation. Finally, the Poiseuille flow was used to validate the feasibility of the proposed method.

LATTICE BOLTZMANN SIMULATION OF A SINGLE CHARGED ELLIPTIC CYLINDER IN A NEWTONIAN FLUID

2004 ◽  
Vol 18 (17n19) ◽  
pp. 2757-2761 ◽  
Author(s):  
CAOYING ZHANG ◽  
HUILI TAN ◽  
MUREN LIU ◽  
LINGJIANG KONG ◽  
HAIPING FANG
Keyword(s):  
Newtonian Fluid ◽  
Lattice Boltzmann ◽  
Present Model ◽  
Elliptic Cylinder ◽  
Coulomb Force ◽  
Initial Condition ◽  
Two Dimensional ◽  
Dynamics Model ◽  
Lattice Boltzmann Simulation ◽  
Boltzmann Method

A two-dimensional dynamics model of an elliptic cylinder is derived by using the lattice Boltzmann method. With the present model, we have simulated the sedimentation of a single charged elliptic cylinder in a two-dimensional tube in a Newtonian fluid. Due to the polarizing effects and non-axial symmetry shape, there are the Coulomb force and the Coulomb torque on the elliptic cylinder during the sedimentation, which change its ordinary motion significantly. Comparing with the sedimentation of an un-charged elliptic cylinder under the same initial condition, we have further discussed the dynamics characteristics of the charged elliptic cylinder, and obtained some interesting results.

Sedimentation of a Single Charged Elliptic Cylinder in a Newtonian Fluid by Lattice Boltzmann Method

2004 ◽  
Vol 21 (6) ◽  
pp. 1108-1110 ◽  
Author(s):  
Zhang Chao-Ying ◽  
Shi Juan ◽  
Tan Hui-Li ◽  
Liu Mu-Ren ◽  
Kong Ling-Jiang
Keyword(s):  
Lattice Boltzmann Method ◽  
Newtonian Fluid ◽  
Lattice Boltzmann ◽  
Elliptic Cylinder ◽  
Boltzmann Method
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