Papers by Author: Rui Jiang

Abstract: A hybrid power composed of fuel cell and MH-Ni battery has become a good strategy for HEV, but the battery cooling system can not be easily optimized because of many important parameters. In this study, the parameter studies have been carried out for checking the effects of the parameters. The candidated parameters in this study were the diameter of the outlets and the distance between the outlets. The analysis results show that the diameter and the distance have the effects expressed by a 2nd order function form. The analysis model and the results in this study make a basis for optimizing the battery cooling system.

Abstract: Silicon nitride presents good mechanical properties and thermal stability at high temperature. To investigate the mechanism of this unique feature demands a proper atomistic simulation, as the experiments have limitations in nano-scale characterization of chemical structure and the related properties. In this paper, the melt-quench method was used to generate the amorphous structure of silicon nitride, and then the corresponding mechanical properties were studied. The simulation results consist with the experimental results on radial distribution function and Young’s modulus.

Abstract: For nanoscale devices and structures, interface phenomena often dominate their overall thermal behavior. The feature scale of material interfaces usually originate from nanometer length and present a hierarchical nature. Considering to the limitations of the continuum mechanics on the characterization of nano-scale, the multiscale model featuring the interface could be very important in materials design. The purpose of this review is to discuss the applications of multiscale modeling and simulation techniques to study the mechanical properties at materials interface. It is concluded that a multi-scale scheme is needed for this study due to the hierarchical characteristics of interface.

Abstract: Thermoforming is one of the most versatile and economical processes available for shaping polymer products. The heating time and heater power must be optimized for obtaining good products efficiently. In this study, the method for calculating the required heat flux was researched at first. In the following step, the analytic solution was studied for getting optimal heating time and heater power. Finally, the relationship between heater power and heating time was discussed. The developed method in this study will be widely used to shorten the cycle time under the condition of satisfying requirements of thermoforming.

Abstract: Obtaining a uniform thickness of the final product using thermoforming is difficult, and the thickness distribution depends strongly on the distribution of the sheet temperature. In this paper, the time-dependent temperature distribution of the total sheets in the stage of storing was studied using the analysis code which has been verified based on the experimental data. It was found out that the time for storing should be managed for decreasing the temperature difference between the sheets. The time-dependent temperature distribution of the total sheets and the method for analysis in this study will be used to improve the quality of the final products.