Flow and mixing analysis of non-Newtonian fluids in straight and serpentine microchannels

Afzal, Arshad; Kim, Kwang‐Yong

doi:10.1016/j.ces.2014.05.021

Cited by 42 publications

(26 citation statements)

References 24 publications

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“…To describe the physical phenomena in fluid mechanics we use mathematical models for different types of fluids such as Newtonian fluids (Picchi et al, 2014;Fzal and Kim, 2014;Villone et al, 2014;Hatami and Domairry, 2014) and non Newtonian fluids (Hatami and Ganji, 2014a,b;Liu et al, 2013). There are many special cases of non-Newtonian fluids such as nano fluids Ahmadi et al, 2014;, micropolar fluid (Srinivasacharya and Upendar, 2014;Hatami and Ganji, 2014c;Pazˇanin, 2013).…”

Section: Introductionmentioning

confidence: 99%

Analytical study of the non orthogonal stagnation point flow of a micro polar fluid

Abbas

Faraz

Bai

et al. 2017

Journal of King Saud University - Science

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In this paper we consider the steady two dimensional flow of micro polar fluids on a flat plate. The flow under discussion is the modified Hiemenz flow for a micro polar fluid which occurs in the hjkns + skms boundary layer near an orthogonal stagnation point. The full governing equation reduced to a modified Hiemenz flow. The solution to the boundary value problem is governed by two non dimensional parameters, the material parameter K and the ratio of the micro rotation to skin friction parameter n. The obtained nonlinear coupled ordinary differential equations are solved by using the Homotopy perturbation method. Comparison between numerical and analytical solutions of the problem is shown in tables form for different values of the governing parameters K and n.

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Section: Introductionmentioning

confidence: 99%

Analytical study of the non orthogonal stagnation point flow of a micro polar fluid

Abbas

Faraz

Bai

et al. 2017

Journal of King Saud University - Science

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“…[1][2][3] Moreover, there are many chemical and biomedical applications that deal with the mixing of two different analytes. [6] Therefore, a comprehensive understanding of their behaviour in these types of devices has to be acquired as well, which leads us to investigate non-Newtonian fluids' mixing in micromixers. [4] While in macroscale, mixing is achieved primarily through turbulence, mixing in microscale relies mainly on diffusion due to the small characteristic dimensions of the channels and the laminar behaviour at low Reynolds numbers (Re ¼ Vd=y where V is the average velocity, d is the characteristic dimension of the channel, and y is kinematic viscosity of the fluid).…”

Section: Introductionmentioning

confidence: 99%

“…The mixing of non-Newtonian fluids such as biofluids, blood samples, and polymer solutions is encountered frequently in microfluidic devices. [6] Therefore, a comprehensive understanding of their behaviour in these types of devices has to be acquired as well, which leads us to investigate non-Newtonian fluids' mixing in micromixers.…”

Section: Introductionmentioning

confidence: 99%

Diffusion and convection mixing of non‐Newtonian liquids in an optimized micromixer

2018

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An optimized planar micromixer has been employed to study its performance in mixing liquids with various rheological behaviours. This design takes advantage of a number of passive techniques, including split-and-recombination of the channel, contraction of the channel, and embedding diamond-shaped obstacles in the main channels. Three-dimensional Navier-Stokes equations, along with an advection-diffusion model are solved by means of a finite-element scheme. Numerical simulations are performed for species with power law indexes ranging from 0.6-1.4, and the resulting mixing efficiencies are compared for different cases. Pressure drop is also evaluated and compared by taking into account the rheological behaviour of the fluids. The results revealed that in the studied range of Reynolds numbers, shear-thickening fluids present higher efficiencies in the diffusion-dominated regimes by 5 % at the best case. Shear-thinning flows have a better performance at higher Reynolds numbers and expedite the diffusion-advection transition point compared to other regimes. Transition occurs at a Reynolds number of 0.1 for the shear-thinning regime, while for Newtonian fluids this point is at a Reynolds number equal to 1. Moreover, it is found that the variation of mixing efficiency for shear-thickening flows with different fluid behaviour indexes is not significant in the studied Reynolds number range.

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“…They found that for both types of fluid, the mixing performance increased by increasing the wave amplitude, extending the length of the wavy-wall section, and decreasing the strength of the electric field. Recently, Afzal and Kim (2014) studied the flow and mixing behavior of Newtonian and non-Newtonian fluid in T-shaped and serpentine microchannels. The properties of water and blood were selected for Newtonian and non-Newtonian fluid simulation, respectively.…”

Section: Nomenclaturementioning

confidence: 99%

Enhancement of Mixing Performance of Non-Newtonian Fluids using Curving and Grooving of Microchannels

Islami

Khezerloo

2017

JAFM

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In this study, a numerical investigation was performed on the mixing of non-Newtonian power-law fluids in curved micromixers with power-law indices between 0.49 and 1 and Reynolds numbers between 0.1-300. The properties of water and CMC solution were used for simulation of Newtonian and non-Newtonian fluid flows, respectively. The effects of grooves embedded on the bottom wall of micromixers and geometrical parameters such as depth and angle of grooves on mixing performance were examined. The mixing of nonNewtonian fluids using this kind of micromixers has not been studied before. Eventually, using of inclined grooves with 30° inclination angle was studied. Open source CFD code of OpenFOAM was utilized to simulate the mixing process. The results showed that the grooves caused chaotic advection and improved the mixing performance but had no significant effect on dimensionless pressure drop. Also, the grooves with 30• angle showed better mixing index for all values of power-law indices.

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Flow and mixing analysis of non-Newtonian fluids in straight and serpentine microchannels

Cited by 42 publications

References 24 publications

Analytical study of the non orthogonal stagnation point flow of a micro polar fluid

Analytical study of the non orthogonal stagnation point flow of a micro polar fluid

Diffusion and convection mixing of non‐Newtonian liquids in an optimized micromixer

Enhancement of Mixing Performance of Non-Newtonian Fluids using Curving and Grooving of Microchannels

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