Kinematic Viscosity Prediction of Polyalkylene Glycol in a Deep-Sea Environment from Molecular Dynamics
DC Xiao and YP Deng and ZY Wang and ZW Jiang and YS Liu, JOURNAL OF CHEMICAL AND ENGINEERING DATA, 68, 3162-3172 (2023).
DOI: 10.1021/acs.jced.3c00432
Using water-glycol hydraulic fluid as a working medium is an important
development direction in deep-sea hydraulic systems. Viscosity is an
important parameter in the characterization of flow fields. The study of
the viscosity characteristics of polyalkylene glycols as a water-glycol
thickener in deep-sea environments can help to research the viscosity
properties of water glycol hydraulic fluid under deep-sea conditions. In
this paper, a molecular dynamics method is used to compute the kinematic
viscosity of PAG 75-W-130 based on the OPLS-AA force field. Dynamic
viscosity was calculated by the nonequilibrium molecular dynamics
method. At ambient pressure and temperatures from 293.15 to 373.15 K,
the calculated density is in accord with the experimental results and
the calculated viscosity is more than the experimental result. Moreover,
the density and dynamic viscosity of PAG 75-W-130 are predicted in a
deep-sea environment. The calculated viscosity and density increase
exponentially with increasing pressure. The density increases from
1069.2 to 1110.4 kg/m(3) at full sea depths, and the viscosity is up to
10.99 Pa
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