基于绝对速率理论的高压液体黏度模型

A Viscosity Model of Liquid Based on Absolute Rate Theory at High Pressures

本文通过考虑压力对流体空穴形成能的影响,并引入参考状态项,对Macías-Salinas绝对速率理论黏度模型进行了改进,建立了一种适用于流体高压液相黏度的推算模型。新模型避免了因计算流体汽化焓与饱和状态下的压缩因子所引入的计算偏差,同时使模型形式得到了简化。利用该模型计算了15种流体在温度为90～440 K、压力为0.01～251.3MPa范围内的液相黏度,计算结果与文献值的相对偏差绝对平均值在2%以内,最大相对偏差绝对值小于9.4%,验证了模型的准确性。

In this work, a viscosity model for liquid at high pressure modified from Macías-Salinas＇ s model was presented, in which the pressure influence on vacancy formation energy was considered and a reference state was introduced. Compared with other model, the enthalpy of vaporization and the compressibility factor at saturated condition are eliminated in the new model, which improves the accuracy and leads to a simpler form. The model was tested by using the experimental viscosity data of 15 liquids at temperatures from 90 K to 440 K and pressures up to 251.3 MPa. The overall average absolute relative deviation of the present model was estimated to be lower than 2%, and the absolute maximum deviation was lower than 9.4%, which verificd the precision of the present model.