Effect of Carreau-Yasuda rheological parameters on subcritical Lapwood convection in horizontal porous cavity saturated by shear-thinning fluid

2017 ◽  
Vol 29 (6) ◽  
pp. 063101 ◽  
Author(s):  
Khaled Khechiba ◽  
Mahmoud Mamou ◽  
Madjid Hachemi ◽  
Nassim Delenda ◽  
Redha Rebhi
Keyword(s):  
Shear Thinning ◽  
Rheological Parameters ◽  
Porous Cavity ◽  
Shear Thinning Fluid

scholarly journals Evaluation of Some Rheological Properties of Xanthan Gum

2020 ◽  
Vol 10 (5) ◽  
pp. 6172-6175 ◽  
Author(s):  
V. T. Phan
Keyword(s):  
Flow Behavior ◽  
Shear Thinning ◽  
Squeeze Flow ◽  
Test Material ◽  
Rheological Parameters ◽  
Circular Plates ◽  
Flow Curves ◽  
Analysis And Evaluation ◽  
Shear Thinning Fluids ◽  
Shear Thinning Fluid

The squeeze flow behavior of a shear thinning fluid was studied in this paper using squeeze tack technique. The test material was firstly squeezed out between two parallel circular plates, then it was relaxed for 1.5min and finally was separated at a predefined pulling velocity. From the flow curves obtained in the squeeze tack experiments, the rheological parameters, including yield stress in tension and in squeeze, have been calculated. The results show that the squeeze-tack test can be used for the analysis and evaluation of shear thinning fluids. Although the experimental results may not be considered complete, it can be seen that the stresses and tensile stresses have a linear relationship witch goes through the origin.

scholarly journals Generation and Dynamics of Janus Droplets in Shear-Thinning Fluid Flow in a Double Y-Type Microchannel

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 149
Author(s):  
Fan Bai ◽  
Hongna Zhang ◽  
Xiaobin Li ◽  
Fengchen Li ◽  
Sang Woo Joo
Keyword(s):  
Surface Tension ◽  
Formation Mechanism ◽  
Computational Study ◽  
Shear Thinning ◽  
Droplet Formation ◽  
Continuous Phase ◽  
Viscous Force ◽  
Rheological Parameters ◽  
Janus Droplet ◽  
Shear Thinning Fluid

Droplets composed of two different materials, or Janus droplets, have diverse applications, including microfluidic digital laboratory systems, DNA chips, and self-assembly systems. A three-dimensional computational study of Janus droplet formation in a double Y-type microfluidic device filled with a shear-thinning fluid is performed by using the multiphaseInterDyMFoam solver of the OpenFOAM, based on a finite-volume method. The bi-phase volume-of-fluid method is adopted to track the interface with an adaptive dynamic mesh refinement for moving interfaces. The formation of Janus droplets in the shear-thinning fluid is characterized in five different states of tubbing, jetting, intermediate, dripping and unstable dripping in a multiphase microsystem under various flow conditions. The formation mechanism of Janus droplets is understood by analyzing the influencing factors, including the flow rates of the continuous phase and of the dispersed phase, surface tension, and non-Newtonian rheological parameters. Studies have found that the formation of the Janus droplets and their sizes are related to the flow rate at the inlet under low capillary numbers. The rheological parameters of shear-thinning fluid have a significant impact on the size of Janus droplets and their formation mechanism. As the apparent viscosity increases, the frequency of Janus droplet formation increases, while the droplet volume decreases. Compared with Newtonian fluid, the Janus droplet is more readily generated in shear-thinning fluid due to the interlay of diminishing viscous force, surface tension, and pressure drop.

scholarly journals Soft Matter Emerging Investigators Issue 2021 - "Propulsion of an elastic filament in a shear-thinning fluid at low Reynolds numbers"

Soft Matter ◽  
2021 ◽  
Author(s):  
Ke Qin ◽  
Zhiwei Peng ◽  
Ye Chen ◽  
Herve Nganguia ◽  
Lailai Zhu ◽  
...  
Keyword(s):  
Soft Matter ◽  
Reynolds Numbers ◽  
Shear Thinning ◽  
Low Reynolds Numbers ◽  
Elastic Filament ◽  
Low Reynolds ◽  
Micro Organisms ◽  
Surrounding Fluid ◽  
Shear Thinning Fluid ◽  
Flexible Appendages

Some micro-organisms and artificial micro-swimmers propel at low Reynolds numbers (Re) via the interaction of their flexible appendages with the surrounding fluid. While their locomotion have been extensively studied with...

scholarly journals Swimming efficiency in a shear-thinning fluid

2017 ◽  
Vol 96 (6) ◽  
Author(s):  
Herve Nganguia ◽  
Kyle Pietrzyk ◽  
On Shun Pak
Keyword(s):  
Shear Thinning ◽  
Swimming Efficiency ◽  
Shear Thinning Fluid
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