报告题目：Laser induced ponderomotive convection in water/Nanoparticles in the radiation and acoustic fields in weakly ionized
主持人：董光炯教授
时间：2017-12-14 14:00
地点：闵行校区物理楼226
报告人简介：
Dr. Mikhail N. Shneider received a master’s degree in theoretical physics (with honors) from the Kazan State University, Russia, a Ph.D. in Plasma physics and Chemistry from All-Union Electrotechnical Institute, Moscow and Doctor of Sciences (highest scientific degree in Russia) in Plasma physics and Chemistry from Institute for High Temperatures, Russian Academy of Sciences, Moscow. Since 1998 until the present, Dr. Shneider has been working at the Mechanical and Aerospace Engineering Department, Princeton University. At present he is a Senior Scientist in the Applied Physics Group. His research interests are in the theoretical study of gas discharge physics; physical gasdynamics; biophysics, atmospheric electrical phenomena; non-linear optics and laser-matter interaction. Dr. Shneider was invited many times as a guest professor to universities in China, France, Germany, Great Britain and Russia. He has more than 180 papers in refereed journals (9 review papers), 3 US patents and two books.
报告内容简介：
Laser induced ponderomotive convection in water
An optically induced convection during IR laser interaction with water or any absorbing liquid will be discussed. The numerical simulations performed using the developed model show that the optical pressure and ponderomotive forces produce water flow in the direction of the laser beam propagation. In the later stage of interaction, when the water temperature rises, the Archimedes force becomes comparable and, ultimately, dominant, producing convection directed against the vector of gravitational acceleration (upward). The theoretical estimates and numerical simulations predict fluid dynamics similar to observed in recent experiments.
Nanoparticles in the radiation and acoustic fields in weakly ionized
Polarization forces in a weakly ionized plasma, acting on neutral atoms and molecules will be considered. These forces may have a noticeable impact on the dynamics of nanoparticle synthesis and growth of soot particles and their thermal balance. Also, an effect of intensive ultrasound on the suspension of soot microparticles and nanoparticles in the inert gas, resulting in the coagulation of relatively large soot particles and leading to the improvement of the efficiency of production of nanoparticles, as has been observed in experiments, will be discussed.