Thermal mixing performances of shear-thinning non-Newtonian fluids inside Two-Layer Crossing Channels Micromixer using entropy generation method: Comparative study

2020 ◽  
Vol 156 ◽  
pp. 108096 ◽  
Author(s):  
Naas Toufik Tayeb ◽  
Kouadri Amar ◽  
Khelladi Sofiane ◽  
Laib Lakhdar ◽  
Lasbet Yahia
Keyword(s):  
Comparative Study ◽  
Entropy Generation ◽  
Shear Thinning ◽  
Newtonian Fluids ◽  
Thermal Mixing

Influence of dome shape on flow structure, natural convection and entropy generation in enclosures at different inclinations: A comparative study

2021 ◽  
Vol 197 ◽  
pp. 106321
Author(s):  
Çağatay Yıldız ◽  
Alp Eren Yıldız ◽  
Müslüm Arıcı ◽  
Nabeeha Amatullah Azmi ◽  
Amin Shahsavar
Keyword(s):  
Natural Convection ◽  
Comparative Study ◽  
Flow Structure ◽  
Entropy Generation ◽  
Dome Shape

High hydrodynamic and thermal mixing performances of efficient chaotic micromixers: a comparative study

2021 ◽  
pp. 108394
Author(s):  
Embarek Douroum ◽  
Samir Laouedj ◽  
Amar Kouadri ◽  
Toufik Tayeb Naas ◽  
Sofiane Khelladi ◽  
...  
Keyword(s):  
Comparative Study ◽  
Thermal Mixing

Formation of droplet of shear‐thinning non‐Newtonian fluids in a step‐emulsification microdevice

AIChE Journal ◽  
2021 ◽  
Author(s):  
Xiyang Liu ◽  
Ziwei Liu ◽  
Shaokun Jiang ◽  
Chunying Zhu ◽  
Youguang Ma ◽  
...  
Keyword(s):  
Shear Thinning ◽  
Newtonian Fluids

ENTROPY GENERATION FOR A NON-NEWTONIAN SHEAR THINNING FLUID WITH VISCOUS HEATING EFFECTS

2017 ◽  
Vol 41 (4) ◽  
pp. 593-607
Author(s):  
Muharrem Imal ◽  
Coskun Ozalp ◽  
Bulent Yaniktepe ◽  
Mohammed Mehdi-Rashidi ◽  
Ertac Hurdogan
Keyword(s):  
Temperature Dependence ◽  
Entropy Generation ◽  
Pseudospectral Method ◽  
Shear Thinning ◽  
Bejan Number ◽  
Parallel Plates ◽  
Heating Effects ◽  
Exponential Temperature Dependence ◽  
Power Law Index ◽  
Shear Thinning Fluid

This paper reports the entropy generation of a two-dimensional, non-isothermal, steady, hydrodynamically and thermally fully-developed flow of an incompressible, non-Newtonian shear thinning fluid between two infinite parallel plates. The inelastic fluid is modeled by a two parameter Carreau constitutive equation with an exponential temperature dependence of viscosity. Temperature dependence of the fluid is modeled through Arrhenius law. Momentum and energy balance equations, which govern the flow, are coupled, and this nonlinear boundary value problem is solved numerically using a Pseudospectral method based on the Chebyshev polynomials. The effect of various flow controlling parameters on velocity, temperature and entropy generation is analyzed. The results indicated that Brinkman number and activation energy have opposite effects on entropy generation due to heat transfer. In contrast to the power-law index, an increase in the material time constant results in a decrease in the Bejan Number.

Sedimentation of finite-size particles in quiescent wall-bounded shear-thinning and Newtonian fluids

2020 ◽  
Vol 129 ◽  
pp. 103291
Author(s):  
Dhiya Alghalibi ◽  
Walter Fornari ◽  
Marco E. Rosti ◽  
Luca Brandt
Keyword(s):  
Finite Size ◽  
Shear Thinning ◽  
Newtonian Fluids

Droplet Formation and Fission in Shear-Thinning/Newtonian Multiphase System Using Bilayer Bifurcating Microchannel

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Yong Ren ◽  
Kai Seng Koh ◽  
Jit Kai Chin ◽  
Jing Wang ◽  
Conghua Wen ◽  
...  
Keyword(s):  
Shear Thinning ◽  
Droplet Formation ◽  
Newtonian Fluids ◽  
Model Systems ◽  
Multiphase System ◽  
Blood Capillaries ◽  
Two Systems ◽  
Flow Through ◽  
Newtonian System ◽  
Droplet Fission

With a novel platform of bilayer polydimethylsiloxane microchannel formed by bifurcating junction, we aim to investigate droplet formation and fission in a multiphase system with complex three-dimensional (3D) structure and understand the variations in mechanism associated with droplet formation and fission in the microstructure between shear-thinning/Newtonian system versus Newtonian/Newtonian system. The investigation concentrates on shear-thinning fluid because it is one of the most ubiquitous rheological properties of non-Newtonian fluids. Sodium carboxymethyl cellulose (CMC) solution and silicone oil have been used as model fluids and numerical model has been established to characterize the shear-thinning effect in formation of CMC-in-oil emulsions, as well as breakup dynamics when droplets flow through 3D bifurcating junction. The droplet volume and generation rate have been compared between two systems at the same Weber number and capillary number. Variation in droplet fission has been found between two systems, demonstrating that the shear-thinning property and confining geometric boundaries significantly affect the deformation and breakup of each mother droplet into two daughter droplets at bifurcating junction. The understanding of the droplet fission in the novel microstructure will enable more versatile control over the emulsion formation and fission when non-Newtonian fluids are involved. The model systems in the study can be further developed to investigate the mechanical property of emulsion templated particles such as drug encapsulated microcapsules when they flow through complex media structures, such as blood capillaries or the porous tissue structure, which feature with bifurcating junction.

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