Viscosities of Liquid Cyclohexane and Decane at Temperatures between (303 and 598) K and Pressures up to 4 MPa Measured in a Dual-Capillary Viscometer

Abstract

The viscosities of cyclohexane and decane are reported at temperatures between (303.15 and 598.15) K and at pressures of (0.1, 1, 2, 3 and 4) MPa. The experiments were carried out with a dual-capillary viscometer that measures the ratio of the viscosities at temperature T and pressure p to that at a reference temperature of 298.15 K and the same pressure. Absolute values of the viscosity were then obtained with an expanded relative uncertainties at 95 % confidence of 3.0 % by combining the measured ratios with literature values of the viscosity at the reference temperature.

Viscosities of Liquid Hexadecane at Temperatures between 323 K and 673 K and Pressures up to 4 MPa Measured Using a Dual-Capillary Viscometer

“…The principle is based on Poiseuille’s law and the fact that the mass flow rates of the test fluid in the two capillaries are identical at a steady state. The working equation is as follows: Here, ρ T /ρ T 0 is the ratio of the densities at temperatures T and T 0 at the mean absolute pressure p M in the measurement capillary; S is a derivative (dΔ p /d Q ) of the pressure drop Δ p with respect to volumetric flow rate Q (measured at the pump conditions); and subscripts denote the reference capillary R, the measurement capillary M, and the relevant temperature. The quantity ( S R, T 0 / S M, T 0 ) cal is obtained in a calibration measurement with T = T 0 .…”

“…to account for secondary flow; 14,15 this factor is a function of the Dean number De and the ratio δ of the capillary radius to the coil radius.…”

Residual entropy model for predicting the viscosities of dense fluid mixtures

“…The viscosity data for CO2 was taken from a precise correlation having an estimated expanded relative uncertainty (k = 2) of approximately 3 % 71 as well as experimental data from Iwasaki and Takahashi 72 . The viscosity data of octane, decane, dodecane and m-xylene were original experimental data measured in our laboratory 18,[73][74][75] with estimated relative uncertainties of 2 %. These data span temperatures from (298 to 473)K and pressures from (0.1 to 200) MPa.…”

“…With this finding, we concluded that, by an appropriate scaling, the experimental data for each component can be collapsed onto a single curve relating reduced viscosity to residual molar entropy. Figure 4 Relative deviations Δη*/η* of the scaled reduced viscosity from the values estimated from equation (15) for each component: (a) decane: , Liu et al 74 ; , Caudwell et al 18 ; , Assael et al 77 ; , Carmichael et al 78 (b) m-xylene: , Caudwell et al 18 ; , Assael et al 30 ; , Et-tahir et al 80 Δη*/η* -S r /hR (e)…”

“…Figure 4Relative deviations Δη*/η* of the scaled reduced viscosity from the values estimated from equation(15) for each component: (a) decane: , Liu et al74 ; , Caudwell et al18 ; , Assael et al77 ; , Carmichael et al78 (b) m-xylene: , Caudwell et al18 ; , Assael et al30 ; , Et-tahir et al80 (c) CO2: , Fenghour et al71 ; , Iwasaki and Takahashi 72 (d) dodecane: ,…”