Governing airflow poses challenges under numerous conditions,particularly for the superposition of aerodynamic behaviors induced by multiple moving boundaries,mainly because of the uncertainty of the aerodynamic mecha...Governing airflow poses challenges under numerous conditions,particularly for the superposition of aerodynamic behaviors induced by multiple moving boundaries,mainly because of the uncertainty of the aerodynamic mechanism.Taking the airflow disturbance in the glass fiber transport process as an example,a numerical method for multidomain coupling is proposed considering dynamic meshing boundaries.Specifically,two-and three-dimensional modeling approaches were utilized to investigate the aerodynamic behavior around a fiber thrower(including a finger wheel and pull wheel)and its axial distribution characteristics,respectively.Some aerodynamic data were obtained through the proposed numerical approach,which is difficult to monitor using experimental strategies.The computational results showed that the flow structure in the external flow field of the fiber thrower was mainly regulated by the pull wheel rather than the finger wheel.The average airflow velocity in a specific region of the fiber thrower was decreased by 25%(from 2 m/s to 1.5 m/s)by improving the cross-sectional shape of the pull wheel.The spatial scale of the vortex clusters around the fiber thrower configured with the improved pull wheel was reduced,providing a novel perspective for understanding the improvement in the aerodynamic behavior.This study on the suppression of multiple-motion boundary-induced airflow is representative of the chemical industry.展开更多
Defect-based engineering of carbon nanostructures is becoming an important and powerful method to modify the electron transport properties in graphene nanoribbon FETs. In this paper, the impact of the position and sym...Defect-based engineering of carbon nanostructures is becoming an important and powerful method to modify the electron transport properties in graphene nanoribbon FETs. In this paper, the impact of the position and symmetry of the ISTW defect on the performance of low dimensional 9AGNR double-gate graphene nanoribbon FET (DG-GNRFET) is investigated. Analyzing the transmission spectra, density of states and current-voltage characteristics shows that the defect effect on the electron transport is considerably varied depending on the positions and the orientations (the symmetric and asymmetric configuration) of the ISTW defect in the channel length. Based on the results, the asymmetric ISTW defect leads to a more controllability of the gate voltages over drain current, and drain current increases more than 5 times. The results have also con rmed the ISTW defect engineering potential on controlling the channel electrical current of DG-AGNR FET.展开更多
基金Supported by Jilin Provincial Youth and Middle-Aged Scientific and Technological Innovation and Entrepreneurship Excellence Talents(Grant No.20210509007RQ)Jilin Provincial Key Scientific and Technological Projects(Grant No.20220201026GX)Jilin Provincial Fundamental Research Funds for the Central Universities(Grant No.2022-JCXK-15).
文摘Governing airflow poses challenges under numerous conditions,particularly for the superposition of aerodynamic behaviors induced by multiple moving boundaries,mainly because of the uncertainty of the aerodynamic mechanism.Taking the airflow disturbance in the glass fiber transport process as an example,a numerical method for multidomain coupling is proposed considering dynamic meshing boundaries.Specifically,two-and three-dimensional modeling approaches were utilized to investigate the aerodynamic behavior around a fiber thrower(including a finger wheel and pull wheel)and its axial distribution characteristics,respectively.Some aerodynamic data were obtained through the proposed numerical approach,which is difficult to monitor using experimental strategies.The computational results showed that the flow structure in the external flow field of the fiber thrower was mainly regulated by the pull wheel rather than the finger wheel.The average airflow velocity in a specific region of the fiber thrower was decreased by 25%(from 2 m/s to 1.5 m/s)by improving the cross-sectional shape of the pull wheel.The spatial scale of the vortex clusters around the fiber thrower configured with the improved pull wheel was reduced,providing a novel perspective for understanding the improvement in the aerodynamic behavior.This study on the suppression of multiple-motion boundary-induced airflow is representative of the chemical industry.
文摘Defect-based engineering of carbon nanostructures is becoming an important and powerful method to modify the electron transport properties in graphene nanoribbon FETs. In this paper, the impact of the position and symmetry of the ISTW defect on the performance of low dimensional 9AGNR double-gate graphene nanoribbon FET (DG-GNRFET) is investigated. Analyzing the transmission spectra, density of states and current-voltage characteristics shows that the defect effect on the electron transport is considerably varied depending on the positions and the orientations (the symmetric and asymmetric configuration) of the ISTW defect in the channel length. Based on the results, the asymmetric ISTW defect leads to a more controllability of the gate voltages over drain current, and drain current increases more than 5 times. The results have also con rmed the ISTW defect engineering potential on controlling the channel electrical current of DG-AGNR FET.
