The atomic arrangement of copper atoms in a carbon nanotube (CNT) channel junction due to electromigration processes is examined using molecular dynamics simulations. A bias voltage is applied along the channel to induce an electromigration force on copper atoms. The results show that the different magnitudes of voltages affect the flow phenomenon of the copper mass, in which the copper mass rotates while flowing through the channel junction. The thermal vibration of copper atoms and interactive forces between the copper mass and the junction play important roles in influencing the atomic configuration of the flow material at the channel junction. (C) 2010 Elsevier B.V. All rights reserved.