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结合自由体积理论黏度模型与跨接方程,本文建立了一个适用于从气相到液相且包含临界区在内的黏度推算模型。以水为研究对象,对其对比密度ρ_r(0.01～2.57)、对比温度T_r(0.46～1.12)范围内的黏度进行了计算,计算值与文献实验值的相对偏差绝对平均值为1.81%,近临界区域相对偏差绝对平均值为4.6%。与现有的自由体积理论黏度模型相比,本文建立的黏度推算模型显著提升了近临界区域黏度的计算精度。
Based on the free-volume theoretical viscosity model and the bridging equation, a viscosity estimation model suitable for the gas-to-liquid phase with the critical region included is established. Taking water as the research object, the viscosities of the relative density ρ_r (0.01 ~ 2.57) and the contrast temperature T_r (0.46 ~ 1.12) were calculated. The absolute value of the relative deviation between the calculated value and the experimental data was 1.81% The absolute value of the relative deviation of the critical area is 4.6%. Compared with the existing theoretical model of free-volume viscosity, the viscosity estimation model established in this paper significantly improves the calculation accuracy of viscosity in the near-critical region.