HARBIN, February, 1996. Only one Chinese athlete, wearing the No. 4 helmet, made it to the finals of the women’s short distant speed skating at the Third Asian Winter Games (TAWG). She was surrounded by one Japanese ...HARBIN, February, 1996. Only one Chinese athlete, wearing the No. 4 helmet, made it to the finals of the women’s short distant speed skating at the Third Asian Winter Games (TAWG). She was surrounded by one Japanese and four South Korean athletes, including some who had set world and Asian records. Almost no one believed that the Chinese woman could win. However, at least one person believed that she could—Yang Yang herself. In a short two minutes, she displayed her brilliance, overshadowing those world and Asian record holders. One day later, she joined her teammates in setting a new world record in the 3,000-meter relay race. Yang Yang emerged as a new star in the winter games.展开更多
Effects of the orientation and apex angle on the settling velocity of conical particles in Bingham plas-tic fluids are numerically investigated over a Reynolds number range of 1 ≤Re ≤100, Bingham number range of 0 ...Effects of the orientation and apex angle on the settling velocity of conical particles in Bingham plas-tic fluids are numerically investigated over a Reynolds number range of 1 ≤Re ≤100, Bingham number range of 0 ≤ Bn ≤ 100, and cone angle range of 20 ≤α≤ 150°. Governing equations (of continuity and momentum) are solved numerically using the finite element method to obtain velocity and pressure fields that are postprocessed to obtain values of the drag coefficien.Futthermore, the effect of cone ori-entation on the flow field is visualized and explored in terms of streamline contours and the morphology of yielded/uny ielded regions. Finally, the obtai ned values of drag are correlated via a simple predictive expression in terms of the modified Reynolds number. The effect of the cone angle on drag is found to be moderate because the drag force acting on the lateral surface is a small fraction of the overall drag.展开更多
文摘HARBIN, February, 1996. Only one Chinese athlete, wearing the No. 4 helmet, made it to the finals of the women’s short distant speed skating at the Third Asian Winter Games (TAWG). She was surrounded by one Japanese and four South Korean athletes, including some who had set world and Asian records. Almost no one believed that the Chinese woman could win. However, at least one person believed that she could—Yang Yang herself. In a short two minutes, she displayed her brilliance, overshadowing those world and Asian record holders. One day later, she joined her teammates in setting a new world record in the 3,000-meter relay race. Yang Yang emerged as a new star in the winter games.
文摘Effects of the orientation and apex angle on the settling velocity of conical particles in Bingham plas-tic fluids are numerically investigated over a Reynolds number range of 1 ≤Re ≤100, Bingham number range of 0 ≤ Bn ≤ 100, and cone angle range of 20 ≤α≤ 150°. Governing equations (of continuity and momentum) are solved numerically using the finite element method to obtain velocity and pressure fields that are postprocessed to obtain values of the drag coefficien.Futthermore, the effect of cone ori-entation on the flow field is visualized and explored in terms of streamline contours and the morphology of yielded/uny ielded regions. Finally, the obtai ned values of drag are correlated via a simple predictive expression in terms of the modified Reynolds number. The effect of the cone angle on drag is found to be moderate because the drag force acting on the lateral surface is a small fraction of the overall drag.
