空心玻璃微球与载气之间传热过程的影响因素
Investigation on heat transfer between furnace atmosphere and hollow glass microspheres
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摘要: 为实现玻璃微球与载气之间传热过程的定量控制，建立了玻璃微球与载气之间的热传递模型，研究了载气组份、温度、压力以及微球直径和壁厚对玻璃微球与载气之间传热过程的影响。结果表明：在干凝胶法制备空心玻璃微球工艺中常用载气组份、温度和压力范围内，载气温度和压力对玻璃微球与载气之间传热阻力的影响都可以忽略，但载气中的氦气含量对微球与载气之间传热阻力的影响很显著。随着微球壁厚的增大，玻璃微球与载气之间传热阻力显著增加。因此，改变载气中的氦气含量可以作为控制微球与载气之间传热过程的有效方法，并且随着微球壁厚的增大，提高载气中的氦气含量对增强载气与微球之间传热性能的作用逐渐增强。Abstract: To explore heat transfer process between the hollow glass microspheres and furnace atmosphere in fabricating hollow glass microspheres by the sol-gel technology, the effect of component percentage, temperature and total pressure of Ar/He gas mixture on the overall thermal resistance between microsphere and furnace atmosphere was studied. The influence of the diameter and the wall thickness of a microsphere on the overall thermal resistance was also investigated. The results show that, in the range of component percentage, temperature and pressure of Ar/He gas mixture commonly used in fabricating hollow glass microspheres by the sol-gel technology, an increase in the volume fraction of helium in the furnace atmosphere can significantly reduce the overall thermal resistance, but increasing t
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