An electrostatic levitator with a single-axis feedback control system was developed on the basis of electric field analysis and optimum design for levitation electrodes. In order to realize the stable levitation of va...An electrostatic levitator with a single-axis feedback control system was developed on the basis of electric field analysis and optimum design for levitation electrodes. In order to realize the stable levitation of various types of materials such as metals, inorganic materials and polymers, we made both experimental and theoretical investigations to solve the four key problems of electric field optimization, sample position detecting, sample charging control and levitation voltage minimization. Under the capacitive induction charging condition, a sample with the size of 2.6–4.5 mm usually bears positive charges amounting to 10-9 Coulomb. Because the single-axis feedback control system responds quickly, it takes the levitated sample only 0.1 s from leaving the bottom electrode until attaining a stable levitation in the upright direction. The levitated sample displays satisfactory levitation stability in both the upright and the horizontal directions owing to the constraining force produced by spherical electrodes.展开更多
This paper researches on parellelization of multiphase space numerical simulation with the case of the gaskinetic algorithm for 3-D flows. It focuses on the techniques of domain decomposition methods, vector reduction...This paper researches on parellelization of multiphase space numerical simulation with the case of the gaskinetic algorithm for 3-D flows. It focuses on the techniques of domain decomposition methods, vector reduction andboundary processing parallel optimization. The HPF parallel program design has been developed by the Parallel Pro-gramming Concept Design (PPCDS). The preferable parallel efficiency has been found by the HPF program in highperformance computer with massive scale parallel computing.展开更多
基金supported by the National Natural Science Foun-dation of China (Grant Nos. 50121101, 50971103 and 50971105)the Program for New Century Excellent Talents in University
文摘An electrostatic levitator with a single-axis feedback control system was developed on the basis of electric field analysis and optimum design for levitation electrodes. In order to realize the stable levitation of various types of materials such as metals, inorganic materials and polymers, we made both experimental and theoretical investigations to solve the four key problems of electric field optimization, sample position detecting, sample charging control and levitation voltage minimization. Under the capacitive induction charging condition, a sample with the size of 2.6–4.5 mm usually bears positive charges amounting to 10-9 Coulomb. Because the single-axis feedback control system responds quickly, it takes the levitated sample only 0.1 s from leaving the bottom electrode until attaining a stable levitation in the upright direction. The levitated sample displays satisfactory levitation stability in both the upright and the horizontal directions owing to the constraining force produced by spherical electrodes.
文摘This paper researches on parellelization of multiphase space numerical simulation with the case of the gaskinetic algorithm for 3-D flows. It focuses on the techniques of domain decomposition methods, vector reduction andboundary processing parallel optimization. The HPF parallel program design has been developed by the Parallel Pro-gramming Concept Design (PPCDS). The preferable parallel efficiency has been found by the HPF program in highperformance computer with massive scale parallel computing.
