ORCID Profile
0000-0002-2922-5268
Current Organisation
Huazhong University of Science and Technology
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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: Informa UK Limited
Date: 07-2006
Publisher: American Physical Society (APS)
Date: 08-10-2020
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: World Scientific Pub Co Pte Lt
Date: 06-2006
DOI: 10.1142/S0129183106009291
Abstract: The natural convection problem in a square cavity filled with heterogeneously porous medium is solved by lattice Boltzmann method. The temperature distribution is fully coupled with the fluid velocity through relaxation time. The present calculated results are in good agreement with available published data. It is found that the porosity of porous media near the walls has significant influence on the heat transfer, and the porosity of middle porous medium has little influence on the natural convection. It is of particular interest for thermal management in electronic packages, since it can reduce the space of air.
Publisher: American Physical Society (APS)
Date: 23-07-2007
Publisher: American Physical Society (APS)
Date: 27-12-2004
Publisher: American Physical Society (APS)
Date: 21-12-2004
Publisher: American Physical Society (APS)
Date: 11-03-2005
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: American Physical Society (APS)
Date: 15-02-2006
No related grants have been discovered for Zhaoli Guo.