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A new reference correlation for the viscosity of methanol

机译：甲醇粘度的新参考相关性

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摘要

A new reference-quality correlation for the viscosity of methanol is presented that is valid over the entire fluid region, including vapor, liquid, and metastable phases. To describe the zero-density viscosity with kinetic theory for polar gases, a new expression for the collision integral of the Stockmayer potential is introduced. The initial density dependence is based on the Rainwater-Friend theory. A new correlation for the third viscosity virial coefficient is developed from experimental data and applied to methanol. The high-density contribution to the viscosity is based on the Chapman-Enskog theory and includes a new expression for the hard-sphere diameter that is a function of both temperature and density. The resulting correlation is applicable for temperatures from the triple point to 630 K at pressures up to 8 GPa. The estimated uncertainty of the resulting correlation (with a coverage factor of 2) varies from 0.6% in the dilute-gas phase between room temperature and 630 K, to less than 2% for the liquid phase at pressures up to 30 MPa at temperatures between 273 and 343 K, 3% for pressures from 30 to 100 MPa, 5% for the liquid from 100 to 500 MPa, and 10% between 500 MPa and 4 GPa. At very high pressures, from 4 to 8 GPa, the correlation has an estimated uncertainty of 30% and can be used to indicate qualitative behavior. (c) 2006 American Institute of Physics.
机译：提出了一种新的甲醇粘度参考质量相关性，该相关性在整个流体区域（包括气相，液相和亚稳相）中均有效。为了用动力学原理描述极性气体的零密度粘度，引入了Stockmayer势碰撞积分的新表达式。初始密度依赖性基于“雨水之友”理论。从实验数据得出了第三粘度维里系数的新的相关性，并将其应用于甲醇。对粘度的高密度贡献是基于Chapman-Enskog理论的，并且包括硬球直径的新表达式，该表达式是温度和密度的函数。所得的相关性适用于在高达8 GPa的压力下从三点到630 K的温度。估计的相关不确定性的不确定性（覆盖因子为2）从室温至630 K的稀气相中的0.6％变化到压力高达30 MPa且液相温度在630 K至630 K之间小于2％ 273和343 K，对于30至100 MPa的压力为3％，对于100至500 MPa的液体为5％，以及在500 MPa和4 GPa之间的10％。在4至8 GPa的极高压力下，相关性的不确定度估计为30％，可用于指示定性行为。 （c）2006年美国物理研究所。

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