【作者】 常翩翩； 张韫宏；

【Author】 CHANG Pian-pian;ZHANG Yun-hong;The Institute for Chemical Physics,Key laboratory of Cluster Science,School of Chemistry,Beijing Institute of Technology;

【机构】 北京理工大学化学物理研究所；

【摘要】 MgSO₄气溶胶在相对湿度（RH）40%以下会形成胶态结构,从而出现传质受阻。本研究采用光镊悬浮技术捕获颗粒尺寸3～8μm的MgSO₄气溶胶液滴来研究低湿度下不同停留时间对MgSO₄液滴扩散系数的影响。结果表明,不同停留时间后的溶胀过程,均分两段过程进行拟合,第一段的扩散系数比第二段的扩散系数大,且每段的扩散系数随停留时间的增大而减小。更多还原

【Abstract】 MgSO₄ aerosol forms a gel state at a relative humidity（RH） blew 40%,thus limited water transport in the droplet.In this study,the effect of different waiting time on the diffusion coefficient of MgSO₄ droplets at low humidity was studied by using optical tweeze to capture MgSO₄ aerosol droplets with a particle size of 3 ～8 μm.The results showed that the swelling process after different waiting time was divided into two stages.The diffusion coefficient of the first stage was larger than that of the second stage and decreased with the increase of waiting time at each stage.更多还原