液氮-一氧化碳-石墨样品的混合机理

Mechanism of intermixing liquid nitrogen-monoxide carbon with graphite

基于低温物理和流体力学原理研究了深冷区液-液相及液-固相体系均匀搅拌-混合的机理.同时,设计了一套适于非接触监测制样过程的光学装置,获得了77 K附近等比例混合的液氮-一氧化碳与石墨超微粉系统的实验数据.重复实验的结果表明,粒度分布为95%〈1μm的分析纯石墨超微粉可与高纯度的冷凝氮-一氧化碳均匀混合,暂稳态维持时间在5~6min之间.

Based on the bubbling agitation adjoined the critical area of liquid nitrogen and monoxide carbon, the probability to prepare a uniform sample with ultrafine powder of graphite and isovolumetric admixture of liquid nitrogen and monoxide carbon, which should be fit for the demand of operating on a two stage light gas gun, has been studied by using a cryo-target and a monitor with three fiber set, ors. Repeated experimental results indicate that the realization of preparation is quite possible, despite the mixing stability time is only held to 5 or 6 minutes, if the distribution of granularity of graphite is limited within 〈 1 μm≥95%, and blending two liquids mentioned above is predetermined. Furthermore, the discrepancy between experimental result and estimate of blending effect is also analyzed.