Numerical Simulation Of Fule Cell And Landfill Site

The lattice Boltzmann method is a very active numerical simulation tool and scientific research method. It can be applied in porous medium fluid, chemistry reaction fluid, the magnetic fluid, the non-Newtonian fluid, multiphase fluid and so on. In comparision with other traditional method, the advantages of the lattice Boltzmann are simple and efficient implementation for parallel computation, clear physical image, simple calculation procedure and boundary treatment, especially easy handling of complex geometries.Microbial fuel cell (MFC) is a new environmental friendly energy device which has received greatly attention due to its technology for producing electricity directly from organic or inorganic matter using bacteria as catalyst. To date, many studies have been carried out on advective flow through porous anode in a continuous flow MFC. However, the precise mechanical mechanism of flow through porous anode and the quantified relationship between porous media and MFC performance are not yet clearly understood. It has been found experimentally the power density can be increased apparently at certain spacing configuration. Based on these available experimental data, we studied the effect of spacing between electrodes and the Darcy number of porous anode on the power generation performance of MFC using lattice Boltzmann method. The simulation results indicated that the spacing between electrodes significantly influence the flow velocity profile and residence time in the MFC. Moreover, it was found that the Darcy number of porous anode could regulate the output efficiency of MFC. Our results would be helpful to optimize MFC design.Landfill is the main method of garbage disposal, but it will cause some environmental problems. There is high concentration of leachate in garbage decomposition process. If the leachate is not addressed, it will seriously polluted the surrounding environment. According to the theory of thermodynamics and permeation fluid mechanics, thermal effect and seepage mechanism in landfill site were analyzed. A temperature field and flow field coupling three-dimensional model in the landfill site is established, and also the finite element numerical solution method corresponding to the mathematical model is presented, and the numerical simulation is carried out. The main research is the effect of the change in temperature and permeability on seepage mechanism of leachate in landfill site. The results show that the interaction between the two will eventually form a stable flow field and temperature field.The development of lattice Boltzmann method numerical simulation was reviewed in the article for the direct methanol fuel cell (DMFC). The up-to-the-minute progress of the lattice Boltzmann method applied in multiphase flow, mass and heat transfer and electrochemical reactions in the fuel cells was described in detail. As a computational fluid dynamic method, the lattice Boltzmann method is an effective and efficient numerical scheme to analyze the performance of the fuel cell. The numerical simulations performed better understanding of the complex phenomena of fuel cells. These processes were needed for optimum call design. The latest research development was also reviewed in the article. At the same time, the deficiency of the present model was pointed out.