炉内成球法制备PVA涂层理论模拟研究  

Theoretical simulation of PVA coating using drop-tower technique

作　　者：张占文[1] 漆小波[1] 唐永建[1] 李波[1] 王朝阳[1] 黄勇[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2006年第11期1837-1840,共4页High Power Laser and Particle Beams

基　　金：等离子体物理国家级重点实验室基金资助课题(51480030204ZW0801)

摘　　要：根据炉内成球法制备PVA涂层原理,建立了炉内成球法在PS微球表面制备PVA涂层的数学模型,并利用数值方法进行了求解,研究了初始PS壁厚和直径、载气种类、炉内温度、PVA含量等实验条件的影响。计算结果表明,包裹PS微球的PVA水溶液复合微球在下落过程中速度迅速增加,短时间内达到最大值后又逐渐降低;复合微球的PVA水溶液涂层厚度逐渐减少,微球表观密度降低;炉内温度较低时,PVA涂层不易烘干;空气和纯Ar做炉内气氛时,微球烘干时间延长,而在He和Ar混合气体中,随着He含量增加,微球烘干时间缩短;小直径PS微球及高含量PVA溶液有利于制备厚的PVA涂层。Polyvinyl alcohol（PVA） capsule layer, as a gas barrier, were developed for the inertial confinement fusion（ICF） program. This paper presented the simulation study on fabrication of PVA coating using drop-tower technique. Based on the heat, mass and momentum transfer of the transformation process, a physical model was established and the related mathematic model was developed. The influence of processing parameters on the transformation was simulated. The key processing parameters that greatly affected the gel-to-shell transformation and the resulting PVA properties had been found to be initial PVA concentration, PS diameter, furnace temperature profile and thermal conductivity of the furnace gas.

关 键 词：惯性约束聚变 炉内成球法 PVA涂层 理论模拟 

分 类 号：TL639.11[核科学技术—核技术及应用]