Probably the most widely used medium is a high-boiling petroleum fraction, usually in the gas-oil range.
最广泛使用的介质可能一般采用瓦斯油沸程内的高沸点石油馏分。
Void fraction is one of the basic parameters in steam liquid two phase flows. To date, the study of methods for calculating subcooled boiling void fraction mainly focused on high mass flow rates.
空泡率是汽液两相流动的基本参数之一，而已有过冷沸腾空泡率计算方法研究以高质量流速为主，且大量文献报道现有空泡率模型难以适用于低流速过冷沸腾工况。
Results showed that, the high boiling fraction yield in-creased by 2-3 percentages in weight by adding a small amount of high molecular active additive.
结果证明，加入少量高分子活性添加物可以提高馏分重量收率3个百分点以上。
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