ORCID Profile
0000-0002-7858-7601
Current Organisation
University of Nottingham Ningbo China
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Publisher: American Physical Society (APS)
Date: 12-03-2014
Publisher: AIP Publishing
Date: 04-2006
DOI: 10.1063/1.2185839
Abstract: In this paper, we study systematically the physical symmetry, spatial accuracy, and relaxation time of the lattice Boltzmann equation (LBE) for microgas flows in both the slip and transition regimes. We show that the physical symmetry and the spatial accuracy of the existing LBE models are inadequate for simulating microgas flows in the transition regime. Our analysis further indicates that for a microgas flow, the channel wall confinement exerts a nonlinear effect on the relaxation time, which should be considered in the LBE for modeling microgas flows.
Publisher: Elsevier BV
Date: 02-2023
Publisher: AIP Publishing
Date: 06-2006
DOI: 10.1063/1.2214367
Abstract: At the macroscale, the hydrodynamics of a fluid can be well described by conventional hydrodynamic models such as the Navier-Stokes equations. However, as the flow passage is shrunk down to the nanometer size, the micro-interaction between the fluid and the confined solid walls becomes significant, and the conventional hydrodynamic model will become insufficient for describing such a flow system. In this work, we propose a generalized hydrodynamic model that is derived from a recently developed kinetic model for strong inhomogeneous fluid systems [Guo, Zhao, and Shi, Phys. Rev. E 71, 035301(R) (2005)]. We show that the present model can reduce to other hydrodynamic models in certain limits, and can be used for flows ranging from nanoscale to macroscale. Based on this generalized model, the static and dynamic behaviors of several simple fluid systems are studied. It is shown that at a small scale, the results predicted by the generalized hydrodynamic model are in agreement with those simulated by the molecular dynamic and the Monte Carlo methods, while for flow systems at a large scale, the results agree with those by the Navier-Stokes equations.
Publisher: Elsevier BV
Date: 2006
Publisher: Elsevier BV
Date: 02-2018
Publisher: American Physical Society (APS)
Date: 23-07-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9RA10899H
Abstract: PDMS–MWCNTs/TiO 2 microparticles made by microfluidics can achieve 85% removal efficiency of RhB pollutant in wastewater via synergetic treatment.
Publisher: American Physical Society (APS)
Date: 22-03-2010
Publisher: American Physical Society (APS)
Date: 11-03-2005
Publisher: Elsevier BV
Date: 03-2020
Publisher: Springer Science and Business Media LLC
Date: 19-05-2017
Publisher: American Physical Society (APS)
Date: 21-07-2015
Publisher: Begellhouse
Date: 2018
Publisher: MDPI AG
Date: 10-02-2017
DOI: 10.3390/MI8020049
Publisher: Elsevier BV
Date: 03-2017
Publisher: AIP Publishing
Date: 08-2022
DOI: 10.1063/5.0096233
Abstract: The lattice Boltzmann (LB) method intrinsically links to the Boltzmann equation with the Bhatnagar–Gross–Krook collision operator however, it has been questioned to be able to simulate noncontinuum bounded gas flows at the micro- and nanoscale, where gas moves at a low speed but has a large Knudsen number. In this article, this point has been verified by simulating Couette flows at large Knudsen numbers (e.g., Kn=10 and Kn=100) through use of the linearized LB models based on the popular half-range Gauss–Hermite quadrature. The underlying cause for the poor accuracy of these conventional models is analyzed in the light of the numerical evaluation of the involved Abramowitz functions. A different thought on velocity discretization is then proposed using the Gauss–Legendre (GL) quadrature. Strikingly, the resulting GL-based LB models have achieved high accuracy in simulating Couette flows, Poiseuille flows, and lid-driven cavity flows in the strong transition and even free molecular flow regimes. The numerical study in this article reveals an essentially distinct but workable way in constructing the LB models for simulating micro- and nanoscale low-speed gas flows with strong noncontinuum effects.
Publisher: Elsevier BV
Date: 06-2023
Publisher: Springer Science and Business Media LLC
Date: 20-08-2019
DOI: 10.1038/S41598-019-48614-2
Abstract: Here, water flow inside large radii semi-infinite carbon nanotubes is investigated. Permeable wall taking into account the molecular interactions between water and a nanotube, and the slip boundary condition will be considered. Furthermore, interactions among molecules are approximated by the continuum approximation. Incompressible and Newtonian fluid is assumed, and the Navier-Stokes equations, after certain assumptions, transformations and derivations, can be reduced into two first integral equations. In conjunction with the asymptotic expansion technique, we are able to derive the radial and axial velocities analytically, capturing the effect of the water leakage, where both mild and exceptionally large leakages will be considered. The radial velocity obeys the prescribed boundary condition at the (im)permeable wall. Through the mean of the radial forces, the sufficiently large leakages will enhance the radial velocity at the center of the tube. On the other hand, unlike the classical laminar flow, the axial velocity attains its maximum at the wall due to the coupling effect with the radial forces as water is being pushed into the proximity of the inner wall. In addition, the axial velocity and the flux with the consideration of the suck-in forces, induced by the tubes’ entry turn out to be one order higher than that without the suck-in forces. All the aforementioned considerations might partially resolve the mysteriously high water penetration through nanotubes. Axial velocity also drops with the tube’s length when the water leakage is permitted and the suck-in forces will ease the decline rate of the axial velocity. The present mathematical framework can be directly employed into the water flow inside other porous nano-materials, where large water leakage is permitted and therefore are of huge practical impact on ultra-filtration and environmental protection.
Publisher: American Physical Society (APS)
Date: 02-05-2019
Publisher: AIP Publishing
Date: 03-2021
DOI: 10.1063/5.0039247
Abstract: Detecting the existence of SARS-CoV-2 in the indoor atmosphere is a practical solution to track the prevalence and prevent the spread of the virus. In this work, a thermophoretic approach is presented to collect the novel coronavirus-laden aerosols from the air and accumulate to high concentrations adequate for the sensitivity of viral RNA detection. Among the factors, the density and particle size have negligible effects on particle trajectory, while the vertical coordinates of particles increase with the rise in heating source temperature. When the heating temperature is higher than 355K, all of the particles exit the channel from one outlet thus, the collecting and accumulating of virus-laden aerosols can be realized. This study provides a potential approach to accelerate the detection of SARS-CoV-2 and avoid a false negative in the following RNA test.
Publisher: Informa UK Limited
Date: 07-2006
Publisher: AIP Publishing
Date: 08-2020
DOI: 10.1063/5.0014522
Abstract: Time periodic electro-osmosis (TPEO) is a popular means to pump liquids or manipulate species of interest in today’s micro- and nanofluidic devices. In this article, we propose a double distribution-function lattice Boltzmann (LB) model to describe its oscillatory flows coupled with electrokinetics in micro- and nanochannels. To remove advective effects, we derive the LB model from a linearized Boltzmann Bhatnagar–Gross–Krook-like equation and formulate its equations depending on the alternating current (AC) frequency, instead of time. This treatment facilitates a direct comparison of the LB results to experimental measurements in practical applications. We assessed accuracy of the proposed frequency-based Linearized LB model by simulating time periodic electro-osmotic flows (TPEOFs) with a thin and a thick electric double layer (EDL) at different Stokes parameters. The results are in excellent agreement with analytical solutions. The model was used to simulate TPEOFs with various EDL thicknesses and those driven by an AC electric field combined with an oscillatory pressure gradient. The simulations show distinct distributions of the electric potential and solution velocity subject to different length ratios and frequency ratios in the flows and interesting flow responses to compounding influences of the applied electric and mechanical driving fields. Importantly, erse vortex patterns and vorticity variations were also revealed for TPEOFs in heterogeneously charged channels. These results demonstrate that the LB model developed in this article can well capture rich TPEO flow characteristics in micro- and nanochannels. It is effective for design and optimization of TPEO-based micro- and nanofluidic devices.
Publisher: Elsevier BV
Date: 02-2009
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: Springer Singapore
Date: 2021
Publisher: American Physical Society (APS)
Date: 27-12-2004
Publisher: American Physical Society (APS)
Date: 21-12-2004
Publisher: Elsevier BV
Date: 05-2018
Publisher: American Physical Society (APS)
Date: 25-11-2019
Publisher: AIP Publishing
Date: 08-04-2005
DOI: 10.1063/1.1874813
Abstract: In this paper, a finite-difference-based lattice Boltzmann (LB) algorithm is proposed to simulate electro-osmotic flows (EOF) with the effect of Joule heating. This new algorithm enables a nonuniform mesh to be adapted, which is desirable for handling the extremely thin electrical double layer in EOF. The LB algorithm has been validated by simulating a problem with an available analytical solution and it is found that the numerical results predicted by the algorithm are in good agreement with the analytical solution. The LB algorithm is also applied to modeling a mixed electro-osmotic ressure driven flow in a channel. The numerical results show that Joule heating plays an important role in EOF.
Publisher: Elsevier BV
Date: 02-2008
Publisher: American Physical Society (APS)
Date: 02-09-2005
Publisher: AIP Publishing
Date: 07-2023
DOI: 10.1063/5.0158713
Abstract: The lattice Boltzmann (LB) method can be formulated directly from the Boltzmann equation with the Bhatnagar–Gross–Krook assumption. This kinetic origin stimulates wide interest in applying it to simulate flow problems beyond the continuum limit. In this article, such a thought is examined by simulating Couette flows from the slip to free molecular flow regimes using the LB models equipped with different discrete velocity spaces, derived from the half-range Gauss Hermite (HGH), Gauss Legendre (GL), Gauss Kronrod (GK), and Gauss Chebyshev first and second quadrature rules. It is found that the conventional HGH-based LB models well describe noncontinuum Couette flows in the slip and weak transition flow regimes. Nonetheless, they suffer from significant errors with the further increasing Knudsen number, even if a large number of discrete velocities have been employed. Their results contrast with those by the LB models derived from the other Gaussian quadrature rules, which have far better accuracy at large Knudsen numbers. In particular, the GL- and GK-based LB models well capture the velocity fields of Couette flows in the strong transition and free molecular flow regimes. These numerical simulations in this article highlight the importance of velocity discretization for the LB simulations at different Knudsen numbers. They reveal that the LB models based on the Gauss Hermite (GH) quadrature rule are not always the best choice for simulating low-speed bounded flows at moderate and large Knudsen numbers under strong noncontinuum conditions, those non-GH-based LB models proposed in this article have yielded more accurate results.
Publisher: Elsevier BV
Date: 05-2023
Publisher: American Physical Society (APS)
Date: 22-04-2011
Publisher: American Physical Society (APS)
Date: 15-02-2006
Publisher: Chinese Journal of Mechanical Engineering
Date: 2010
No related grants have been discovered for Yong Shi.