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Hu X.-Q.,State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body | Hu X.-Q.,Hunan University | Wu P.-Q.,Hunan University | Wang T.,Hunan University
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A

Capsules which are liquid droplets enclosed by a thin elastic membrane are widely found in biotechnology, food and pharmaceutical industry. We use a three-dimensional numerical model (coupled by boundary integral method and finite element method) to simulate the deformation flow of a capsule in rectangular channels. The capsule flowing in a rectangular channel is found to be less deformed than that in a square channel. The effects of size ratio and capillary number on the capsule deformation are also discussed. It is possible to use a rectangular channel for the inverse analysis of membrane property. © 2015, Publishing House for Journal of Hydrodynamics. All right reserved. Source

Zhou D.,State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body | Zhou D.,Hunan University | Xu S.,Hunan University | Zhang F.,Hunan University | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering

The mechanical and thermodynamic properties of intermetallic compound in Mg-Al-Ca alloy have been investigated by Castep and Dmol program based on the density functional theory. The results show that DI3-Al4Ca is a ductility phase, on the contrary C15-Al2Ca and C14-Mg2Ca are of very good brittleness in Mg-Al-Ca alloy, and among the three phases, C15-Al2Ca is a phase with the worst plasticity. The melting point of intermetallic compound are estimated based on the calculated elastic constants; it is found that the estimated values of Al2Ca are in well agreement with the corresponding experimental values and the error relative to the experiment result is about 4.06%. By calculating the thermodynamic properties of intermetallic compound in Mg-Al-Ca alloy at different temperatures, it is found that Gibbs free energy of Al2Ca is the smallest as well as has the highest structural stability within the temperature range of 298.15-425 K, the next is Al4Ca, and the last one is Mg2Ca. In addition, with the elevated temperature, Gibbs free energy of Mg2Ca is decreased at the most rapid speed, meaning that its structural stability may be improved more rapidly as well. When the temperature is above 525 K, the case is changed; it is found that Mg2Ca has the highest structural stability, the next is Al2Ca, and the last one is Al4Ca. Source

Xue B.Y.,Southwest Jiaotong University | Wu S.C.,Southwest Jiaotong University | Wu S.C.,State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body | Zhang W.H.,Southwest Jiaotong University | Liu G.R.,University of Cincinnati
International Journal of Computational Methods

By smoothing, via various ways, the compatible strain fields of the standard finite element method (FEM) using the gradient smoothing technique, a family of smoothed FEMs (S-FEMs) has been developed recently. The S-FEM possesses the advantages of both mesh-free methods and the standard FEM and works well with triangular and tetrahedral background cells and elements. Intensive theoretical investigations have shown that the S-FEM models can achieve numerical solutions for many important properties, such as the upper bound solution in strain energy, free from volumetric locking, insensitive to the distortion of the background cells, super-accuracy and super-convergence in displacement or stress solutions or both. Engineering problems, including complex heat transfer problems, have also been analyzed with better accuracy and efficiency. This paper presents the general formulation of the S-FEM for thermal problems in one, two and three dimensions. To examine our formulation, some computational results are compared with those obtained using other established means. © 2013 World Scientific Publishing Company. Source

Chen X.,Jilin University | Zhou J.L.,State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body
Advanced Materials Research

The 3-D digital models are established for two kinds of base styling of rearview cover. The compare analysis using Fluent model is based on the acoustic theory of computation. The results show that the average sound pressure level of up-raised rearview cover model is about 5 dB lower than that down-raised rearview cover model, and in all of the frequency range were apparently different. At the same time, the vortex of down-raised happened at the back location, which is more closer to the passenger's ear, and affect the car interior noise. The results of analysis will conduct the design of rearview styling effectively. © (2012) Trans Tech Publications, Switzerland. Source

Deng Y.W.,State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body | Han W.,State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body | Yin L.,Hunan University
Advanced Materials Research

A better understanding of the adsorption behaviors of hydrocarbons on adsorbent would help trap the hydrocarbons emitted from diesel engines during cold start period more efficiently. In this paper, the adsorption behaviors of hydrocarbons in LTA zeolite was studied using Grand Canonical Monte Carlo (GCMC) simulation. The adsorption isotherms and mass clouds are obtained for both pure component and binary mixtures under certain temperatures. The adsorption isotherms reveal that the average loading of ethylene and propylene has the similar trend. Both of them increase with the increase of pressure and decrease significantly with the increase of temperature. The binary mixtures show competitive adsorption behavior. Propylene is adsorbed much more strongly than ethylene in LTA zeolite. The obtained mass clouds show that propylene distributes in both the α cage and β cage of the LTA zeolite, while ethylene distributes mainly in the β cage of the LTA zeolite. © (2013) Trans Tech Publications, Switzerland. Source

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