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
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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。Abstract: 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.
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Key words:
- inertial confinement fusion /
- drop tower technique /
- pva coating /
- theoretical simulation
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