Evaluation of Hydrodynamic and Thermal Behaviour of Non-Newtonian-Nanofluid Mixing in a Chaotic Micromixer

Tayeb, Naas Toufik; Hossain, Shakhawat; Khan, Abid Hossain; Mostefa, Telha; Kim, Kwang‐Yong

doi:10.3390/mi13060933

Cited by 6 publications

(4 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mixing efficiency and pressure drop alone is not sufficient to have a complete comparison among various mixers. Hence, mixing cost is computed by using pumping power which is used to flow liquid inside the mixer by following the equation [12]- [13], [47],…”

Section: Numerical Setup and Methodologymentioning

confidence: 99%

Numerical Analysis of a Planar O Micromixer with Obstacles

Mahmud

2022

J. eng. adv.

View full text Add to dashboard Cite

Passive mixers rely on the channel geometry to mix fluids and mixing depends primarily on diffusion. However, many previously reported designs either work efficiently only at moderate to high Reynolds numbers (Re) or require a complex 3D channel geometry that is often difficult to fabricate. In this paper, we report the design, simulation, and characterization of a planar O passive microfluidic mixer with two types of obstacles to enhance mixing performance. Numerical investigation on mixing and flow structures in microchannels is carried out using the computational fluid dynamics (CFD) software ANSYS 15 for a wide range of Reynolds numbers from 1 to 200. The results show that the O mixer with obstacles has far better mixing performance than the O mixer without obstacles. The reason is that fluid path length becomes longer due to the presence of obstacles which gives fluids more time to diffuse. For all cases, the O mixer with circular & fin obstacles have 3 times more efficient compared to the O mixer without obstacles. It is also clear that efficiency increase with axial length as expected. Efficiency can be simply improved by adding extra mixing units to provide adequate mixing. The value of the pressure drop is the lowest for the O mixer because there is no obstacle inside the channel. However, the O mixer with circular & fin obstacles has the lowest mixing cost, an important characteristic for integration into complex, cascading microfluidic systems, which makes it the most cost-effective mixer. Due to the simple planar structure and low mixing cost, it can be easily realized and integrated into devices for various macromixing applications.

show abstract

Section: Numerical Setup and Methodologymentioning

confidence: 99%

Numerical Analysis of a Planar O Micromixer with Obstacles

Mahmud

2022

J. eng. adv.

View full text Add to dashboard Cite

show abstract

“…The temperature gradient formed in the channel generates convective secondary flow, creating an environment conducive to mixing. Recent studies have also focused on thermal mixing and the thermal behavior of non-Newtonian fluids [112,113].…”

Section: Other Techniquesmentioning

confidence: 99%

Microfluidic Mixing: A Physics-Oriented Review

Saravanakumar,

Cicek

2023

Micromachines

View full text Add to dashboard Cite

This comprehensive review paper focuses on the intricate physics of microfluidics and their application in micromixing techniques. Various methods for enhancing mixing in microchannels are explored, with a keen emphasis on the underlying fluid dynamics principles. Geometrical micromixers employ complex channel designs to induce fluid–fluid interface distortions, yielding efficient mixing while retaining manufacturing simplicity. These methods synergize effectively with external techniques, showcasing promising potential. Electrohydrodynamics harnesses electrokinetic phenomena like electroosmosis, electrophoresis, and electrothermal effects. These methods offer dynamic control over mixing parameters via applied voltage, frequency, and electrode positioning, although power consumption and heating can be drawbacks. Acoustofluidics leverages acoustic waves to drive microstreaming, offering localized yet far-reaching effects. Magnetohydrodynamics, though limited in applicability to certain fluids, showcases potential by utilizing magnetic fields to propel mixing. Selecting an approach hinges on trade-offs among complexity, efficiency, and compatibility with fluid properties. Understanding the physics of fluid behavior and rationalizing these techniques aids in tailoring the most suitable micromixing solution. In a rapidly advancing field, this paper provides a consolidated understanding of these techniques, facilitating the informed choice of approach for specific microfluidic mixing needs.

show abstract

“…Menni et al 2 introduced an analysis of the hydrodynamic and thermal of water, ethylene glycol and water-ethylene glycol as base liquids isolated by aluminum oxide nano-measured dense particles. Tayeb et al 3 evaluated the hydrodynamic and thermal performances of nanofluids (NFs) in a chaotic situation. Phan et al 4 prepared a numerical investigation on concurrent thermodynamic and hydrodynamic instruments of subaquatic explosion.…”

mentioning

confidence: 99%

A study of pressure-driven flow in a vertical duct near two current-carrying wires using finite volume technique

Ali

Jamshed

Devi

et al. 2022

Sci Rep

View full text Add to dashboard Cite

For heating, ventilation or air conditioning purposes in massive multistory building constructions, ducts are a common choice for air supply, return, or exhaust. Rapid population expansion, particularly in industrially concentrated areas, has given rise to a tradition of erecting high-rise buildings in which contaminated air is removed by making use of vertical ducts. For satisfying the enormous energy requirements of such structures, high voltage wires are used which are typically positioned near the ventilation ducts. This leads to a consequent motivation of studying the interaction of magnetic field (MF) around such wires with the flow in a duct, caused by vacuum pump or exhaust fan etc. Therefore, the objective of this work is to better understand how the established (thermally and hydrodynamically) movement in a perpendicular square duct interacts with the MF formed by neighboring current-carrying wires. A constant pressure gradient drives the flow under the condition of uniform heat flux across the unit axial length, with a fixed temperature on the duct periphery. After incorporating the flow assumptions and dimensionless variables, the governing equations are numerically solved by incorporating a finite volume approach. As an exclusive finding of the study, we have noted that MF caused by the wires tends to balance the flow reversal due to high Raleigh number. The MF, in this sense, acts as a balancing agent for the buoyancy effects, in the laminar flow regime

show abstract

Evaluation of Hydrodynamic and Thermal Behaviour of Non-Newtonian-Nanofluid Mixing in a Chaotic Micromixer

Cited by 6 publications

References 41 publications

Numerical Analysis of a Planar O Micromixer with Obstacles

Numerical Analysis of a Planar O Micromixer with Obstacles

Microfluidic Mixing: A Physics-Oriented Review

A study of pressure-driven flow in a vertical duct near two current-carrying wires using finite volume technique

Contact Info

Product

Resources

About