Rarefied flow separation in microchannel with bends

Ho, Minh Tuan; Li, Jun; Wu, Lei; Wu, Lei; Borg, Matthew K.; Li, Zhihui; Zhang, Yonghao

doi:10.1017/jfm.2020.585

Cited by 25 publications

(17 citation statements)

References 41 publications

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“…The particles suspended in the airflow are injected into the traditional inertial separation system, and some particles with sufficient momentum can pass through the streamline and be separated. However, other airflows with insufficient momentum will leave as the airflow deflected [ 29 ]. It can be seen from Figure 6 a,b that the velocity of particles in the collecting tank is close to 0, and there is no pressure distribution in the collecting tank.…”

Section: Resultsmentioning

confidence: 99%

A Rapid Detection Method for Tomato Gray Mold Spores in Greenhouse Based on Microfluidic Chip Enrichment and Lens-Less Diffraction Image Processing

Wang

Mao

Zhang

et al. 2021

Foods

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It is of great significance to find tomato gray mold in time and take corresponding control measures to ensure the production of tomato crops. This study proposed a rapid detection method for spores of Botrytis cinerea in green-house based on microfluidic chip enrichment and lens-free diffraction image processing. Microfluidic chip with a regular triangular inner rib structure was designed to achieve the enrichment of Botrytis cinerea spores. In order to obtain the diffraction image of the diseased spores, a lens-less diffraction imaging system was built. Furthermore, the collected spore diffraction images were processed and counted. The simulation results showed that the collection efficiency of 16 μm particles was 79%, 100%, and 89% at the inlet flow rate of 12, 14 and 16 mL/min, respectively. The experimental verification results were observed under a microscope. The results showed that when the flow rate of the microfluidic chip was 12, 14 and 16 mL/min, the collection efficiency of Botrytis cinerea spores was 70.65%, 87.52% and 77.96%, respectively. The Botrytis cinerea spores collected in the experiment were placed under a microscope for manual counting and compared with the automatic counting results based on diffraction image processing. A total of 10 sets of experiments were carried out, with an error range of the experiment was 5.13~8.57%, and the average error of the experiment was 6.42%. The Bland–Altman method was used to analyze two methods based on diffraction image processing and manual counting under a microscope. All points are within the 95% consistency interval. Therefore, this study can provide a basis for the research on the real-time monitoring technology of tomato gray mold spores in the greenhouse.

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Section: Resultsmentioning

confidence: 99%

A Rapid Detection Method for Tomato Gray Mold Spores in Greenhouse Based on Microfluidic Chip Enrichment and Lens-Less Diffraction Image Processing

Wang

Mao

Zhang

et al. 2021

Foods

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“…The enrichment efficiency of 10 μm particles was low. Because 10 μm particles have a smaller diameter and smaller inertia when the density is constant, and they flow out from the particle exit 2 as the gas flows out [36] .…”

Section: Figure 4 Statistical Results Of Particle Enrichmentmentioning

confidence: 99%

Separation-enrichment method for airborne disease spores based on microfluidic chip

Zhang

Yang

et al. 2021

International Journal of Agricultural and Biological Engineering

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Airborne diseases are likely to cause crop yield reduction, which has aroused widespread concern. In this study, a two-stage separation-enrichment structure microfluidic chip with a compound field for separation and enrichment of the greenhouse crops airborne disease spores directly from gas flow was developed. The chip is mainly composed of three parts: arc structure pretreatment channel, semicircular electrode structure and collection tank. COMSOL 5.1 software was used to simulate the designed microfluidic chip. 30 µm particles were used to represent P. xanthii spores, 25 µm particles were used to represent P. cubensis spores, and 16 µm particles were used to represent B. cinerea spores. The simulation results showed that the separation and enrichment efficiency of 16 μm particles, 25 μm particles, and 30 μm particles was 88%, 91%, and 94%, respectively. The experimental verification results were observed under a microscope. The results showed that the separation and enrichment efficiency of B. cinereal spores, P. cubensis spores and P. xanthii spores was 75.7%, 83.8% and 89.4%, respectively. As a result, the designed microfluidic chip can be used to separate and enrich the spores of airborne diseases of greenhouse crops, which can provide a basis for the research of real-time monitoring technology for greenhouse airborne diseases.

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“…Slip dynamics of fluids over a solid surface has been extensively studied experimentally (Zhu & Granick 2001;Secchi et al 2016;Henot et al 2018), theoretically (Richardson 1973;Lauga & Stone 2003;Nott 2011;Wu et al 2017;Zampogna, Magnaudet & Bottaro 2018;Wang & Hadjiconstantinou 2019) and numerically (Thompson & Troian 1997;Sholl & Johnson 2006;Martini et al 2008a,b;Falk et al 2010;Bailey, Hibberd & Power 2017;Ho et al 2020). Due to difficulties and limitations of experimental and theoretical studies, molecular dynamics (MD) simulations have been widely adopted to probe the microscopic slip behaviours of fluids at the fluid-solid interface (Thompson & Troian 1997;Hsu & Patankar 2010).…”

Section: Introductionmentioning

confidence: 99%

“…2010; Bailey, Hibberd & Power 2017; Ho et al. 2020). Due to difficulties and limitations of experimental and theoretical studies, molecular dynamics (MD) simulations have been widely adopted to probe the microscopic slip behaviours of fluids at the fluid–solid interface (Thompson & Troian 1997; Hsu & Patankar 2010).…”

Section: Introductionmentioning

confidence: 99%

Molecular kinetic modelling of nanoscale slip flow using a continuum approach

Shan

Wang

et al. 2022

J. Fluid Mech.

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One major challenge for a continuum model to describe nanoscale confined fluid flows is the lack of a boundary condition that can capture molecular-scale slip behaviours. In this work, we propose a molecular-kinetic boundary condition to model the fluid–surface and fluid–fluid molecular interactions using the Lennard–Jones type potentials, and add a mean-field force to the momentum equation. This new boundary condition is then applied to investigate the nanoscale Couette and Poiseuille flows using the generalised hydrodynamic model developed by Guo et al. (Phys. Fluids, volume 18, issue 6, 2006a, 067107). The accuracy of our model is validated by molecular dynamics simulations and other models for a broad range of parameters including density, shear rate, wettability and channel width. Our simulation results reveal some unexpected and unintuitive slip behaviours at the nanoscale, including the epitaxial layering structure of fluids and the slip length minimum. The slip length minimum, which is analogous to the Knudsen minimum, can be explained by competing fluid–solid and fluid–fluid molecular interactions as density varies. A new scaling law is proposed for the slip length to account for not only the competing effect between the fluid–solid and fluid–fluid molecular interactions, but also many other physical mechanisms including the competition between the fluid internal potential energy and kinetic energy, and the confinement effect. While the slip length is nearly constant at the low shear rates, it increases rapidly at the high shear rates due to friction reduction. These molecular-scale slip behaviours are caused by energy corrugations at the fluid–solid interface where strong fluid–solid and fluid–fluid molecular interactions interplay.

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Rarefied flow separation in microchannel with bends

Abstract: Abstract

Cited by 25 publications

References 41 publications

A Rapid Detection Method for Tomato Gray Mold Spores in Greenhouse Based on Microfluidic Chip Enrichment and Lens-Less Diffraction Image Processing

A Rapid Detection Method for Tomato Gray Mold Spores in Greenhouse Based on Microfluidic Chip Enrichment and Lens-Less Diffraction Image Processing

Separation-enrichment method for airborne disease spores based on microfluidic chip

Molecular kinetic modelling of nanoscale slip flow using a continuum approach

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