Advanced Materials Research Vols. 557-559

Abstract: 3d models of the equipments of freshwater generator system are built according to the real ship. In support of a simulative sustainable system, a real-time variable database and mathematical models of the subsystem are set up. Then the precision of the models are proved to meet the demands by comparing the simulation results with the practical situation. The interfaces are available by making use of VC++6.0. Finally, the data connections between the math models and interfaces are established by means of the technology of network communications. The purpose of developing this simulation system is training, which offers students a chance to make a good knowledge of the structure and working principle of the freshwater generator subsystem.

Abstract: In this paper, we introduce the entropy theory and energy theory into the research of analyzing the crack open and propagation. Regulation, analyzing the factors that affect fractured crack propagation, and establishing the method of researching fractured crack propagation using entropy theory. Transforming the stress factor that affect crack propagation into entropy value, and on that basis we established the entropy variation equation for calculating the crack open, and obtained the new criterion and model for calculating fracturing crack open. Obtaining a new method for describing crack propagation regulation from the entropy aspect. Revealing the nature of crack open, propagation and close from microscope.

Abstract: In order to accurately describe the law of fracture propagation, the article, from the energy distribution, presents a new idea about establishing the criterion of crack propagation, explores the regulation of energy changes in the fracture propagation process and then obtains the relevant expression of driving force of fracture propagation. At the same time, it has put the criterion of crack propagation forward with the expression of driving force of fracture propagation, builds the calculation model of crack propagation rates. The calculating result is accurate and agrees well with practical ones

Abstract: In order to study the characteristics of flow around a side abutment, two model experiments of flow around rectangular and semicircular cross-section cylinder were conducted respectively, and an acoustic doppler velocimeter(ADV) was used to measure the instantaneous three-dimensional velocity components at vertical sections of two kinds of flow around the cylinder. Moreover, velocity vector, absolute velocity and turbulent kinetic energy were analyzed respectively at different vertical sections. The results reveal that: under the same conditions of upstream coming flow, the turbulence of the flow around a rectangular cross-section cylinder is strong ,and the maximum velocity are generated in the middle reaches of the cylinder near the side wall, The value of turbulent kinetic energy in the mainstream area is nearly zero. The flow around a semicircular cross-section cylinder is smooth, recirculation in the downstream is small, and the turbulence is weak.

Abstract: The coupled lattice Boltzmann method (CLBM) is applied in investigating contamination transport in shallow water flows. Shallow water equations and advection-diffusion equation are both solved using lattice Boltzmann method (LBM) on a D2Q9 square lattice and Bhatnagar-Gross-Krook (BGK) term. For extending application of CLBM in shallow water flows, the well-balanced scheme is introduced to replace the source term. Three cases including dam break, 2D pure diffusion and complex tidal flow are calculated and analyzed. Dam break and 2D pure diffusion are prepared to validate the flow module and water quality module, respectively. Both the cases show satisfactory consistency between predicting results and analytical solutions. Since clear reproduction of the shock wave propagation and precise prediction of contamination transport are derived, LBM is proved to be the numerical method naturally conservative with acceptable computing error. Furthermore, complex tidal flow with irregular geometry and sinus-varied bathymetry is simulated by adopting the well-balanced treating on the source term. The velocity fields, water levels, and water quality are compared between the ebb tide and flood tide, the results of which are in excellent accordance with the physical laws during the process. Hence, it may demonstrate that improved by well-balanced scheme CLBM can be widely applicable in shallow water flow.

Abstract: An equilibrium stage model for preparing sodium methoxide from sodium hydroxide and methanol in a reactive distillation column was developed using Aspen Plus simulator. The simulation was in good agreement with plant data. Effects of bottom-to-overhead feed ratio, content of water in bottom feed and methanol-to-NaOH mass ratio in overhead feed were discussed. The results is of reference value for prediction and optimization of industrial process.

Abstract: A novel pipeline steel was prepared by the vacuum inducting technology, using Gleeble-3500 hot simulator, its parameters of thermo-mechanical control process (TMCP), such as heating temperature, finish rolling temperature, finish cooling temperature and cooling rate, have been studied by the orthogonal experiment with four factors and three levels. Through the orthogonal theoretical analysis, it is found that the sequence of the effect of parameters on the mechanical property is: Cooling rate > Heating temperature > Finish cooling temperature > Finish rolling temperature, the cooling rate is the most important factor affecting the inspection target and possesses a great influence on the hardness of the pipeline steel.

Abstract: Cancer is one of the leading causes for human death. However, if cancer cells are identified at initial stage, patient treatment will be low cost and successful. This research presents the design and simulation of ascending curvilinear micro channel for separation of particles resembling cancer cells. The separation system is designed and simulated by using inertia focusing cell separation technique. Computational fluid dynamics (CFD) design and simulation of ascending micro channel for cell separation using inertial focusing technique is used for separation. The simulation was carried in two stages; for focusing and separation. The mixture flow velocities were 0.105 m/s, 115 m/s and 125 m/s, and with Reynolds number Re = 8.5, 9.25 and 10.06. The ascending curvilinear channel design demonstrated favorable focusing, and separation. 100% purity and 100 % efficiency for separation of 15 µm particles was achieved at Re = 8.50 and maximum output/input ratio at velocity 0.105m/s. Cancer cells are also of size about 15 µm and the our proposed micro channel is a good candidate for cancer cells separation from blood.

Abstract: Based on positional FEM (finite element method), the nonlinear static formulation to treat large deflection of variable cross-section beam element is created by using the lowest potential energy theory. Adopting linear constitutive relation for hyper-elastic materials, the formulation and the solution procedure by Newton-Raphson iteration method are very simple.

Abstract: Based on positional finite element method, this paper attempts to find beam elements that can show the characteristics of the variable cross-section beam and can be practically applied. In this paper, the stain on a random point of the variable cross-section beam element is obtained when beam depth changes in a linear or quadratic parabolic way and beam width is fixed. The calculation is different and simpler than the classical nonlinear FEM.