High-Pressure Viscosity Measurements for the Binary Mixture HFE-7500 + Diisopropyl Ether

Abstract

In this work, high-pressure viscosity measurements for seven compositions of the binary mixture (x) HFE-7500 + (1 − x) diisopropyl ether were carried out. A set of 163 points have been measured covering the temperature range (293.15−353.15) K and pressure up to 100 MPa by using a falling body viscometer with an experimental uncertainty of ±2%. At 0.1 MPa, the viscosity determinations were conducted by using an Ubbelohde capillary viscometer with an uncertainty of ±1%. The experimental high-pressure viscosity data were correlated as a function of pressure and temperature by employing a Vogel−Fulcher−Tammann equation.

Density, Viscosity, and Derivative Properties of Diethylene Glycol Monoethyl Ether Under High Pressure and Temperature

“…Several models and equations have been proposed to estimate the dynamic viscosity (η) in the literature. − In this work, the dynamic viscosity measurements at atmospheric and high pressure for 2-(2-ethoxyethoxy)­ethanol were correlated using the modified equation of Vogel–Fulcher–Tammann (VFT) perceived to be practical and effective for high pressure and temperature data. , The modified VFT equation employed in the present work to fit the experimental data of η at 0.1 MPa has the following expression Whereas at high pressure, the measurements were fitted by employing the following expression where A , B , C , a 1 , a 2 , b 1 , and b 2 are adjustable parameters, and Δ P = P – P ref with P ref is the pressure of reference, which in this work is P ref = 0.1 MPa. The least-squares method was implemented to get the seven adjustable parameters by reducing the sum of squared residuals derived from differences in the experimental and calculated values.…”