Experimental investigation of microparticle focusing in SiO2 nanofluids inside curvilinear microchannels

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION Microfluidics and Nanofluidics Pub Date : 2023-12-20 DOI:10.1007/s10404-023-02700-0
Arsalan Nikdoost, Pouya Rezai
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Abstract

Curvilinear microchannels have enabled high throughput sized-based separation and manipulation of microparticles. Real life applications usually deal with fluid’s non-Newtonian behavior, where particles dynamics are altered compared to Newtonian mediums. Despite multiple reports on particle manipulation in shear-thinning fluids, no fundamental experimental investigation has been reported on microparticle focusing behavior inside shear-thickening fluids such as metallic oxide nanofluids in water (e.g., SiO2-water). These nanofluids pose unique thermal characteristics and exhibit a drastic increase in viscosity as the shear rate rises in the microchannel. Here, we investigate the particle focusing behavior of co-flows of SiO2 nanofluids inside curved microchannels with various channel widths and radii of curvature. We also report on the effect of nanofluid concentration, fluid axial velocity, and the particle size on particle migration. We observed a behavioral change in particle migration in SiO2 nanofluids, where the shear-dependent effect could enhance the particle focusing at lower flow rates. Moreover, the dominance of Dean drag at higher axial velocities would dominate the particle migration and transfer them towards two focusing peaks close to the sidewalls. A thorough investigation of particle behavior in nanofluids inside curved microchannels could enable future applications in heat exchangers, solar energy collectors, and nanoplastic detection.

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曲线微通道内 SiO2 纳米流体中微颗粒聚焦的实验研究
曲线微通道实现了微颗粒的高通量大小分离和操作。现实生活中的应用通常涉及流体的非牛顿行为,与牛顿介质相比,粒子的动力学会发生改变。尽管有许多关于在剪切稀化流体中操纵微粒的报道,但还没有关于微粒在剪切增稠流体(如水中的金属氧化物纳米流体,如二氧化硅-水)中聚焦行为的基础实验研究报道。这些纳米流体具有独特的热特性,随着微通道中剪切速率的上升,粘度也会急剧增加。在此,我们研究了具有不同通道宽度和曲率半径的弯曲微通道内二氧化硅纳米流体共流的粒子聚焦行为。我们还报告了纳米流体浓度、流体轴向速度和颗粒大小对颗粒迁移的影响。我们观察到颗粒在二氧化硅纳米流体中的迁移行为发生了变化,其中剪切依赖效应可在较低流速下增强颗粒聚焦。此外,在较高的轴向速度下,迪安阻力将主导颗粒的迁移,并将颗粒向靠近侧壁的两个聚焦峰转移。对弯曲微通道内纳米流体中的粒子行为进行深入研究,有助于未来在热交换器、太阳能收集器和纳米塑料检测中的应用。
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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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