Viscosity of twelve hydrocarbon liquids in the temperature range 298?348 K at pressures up to 110 MPa

Vibrating-wire viscometers for liquids at high pressures

“…In addition, the data of Knapstad et al [19] along the saturation line deviated by no more than +0.5 % for the present representation at any temperature, which is again consistent with the combined uncertainty. The results of Kashiwagi and Makita [22], which have a claimed uncertainty of + 2 % and extend up to a pressure of 100 MPa, show a rather greater and systematic deviation from the present work but it remains within the mutual uncertainty. …”

“…In addition, the condition given by Eq. (4) requires that co 4~ c/eR (22) These conditions make it clear that the choice of the smallest value of e (the amplitude of the wire motion as a fraction of radius) which is practicable provides the best design. Accordingly, it is necessary to consider practical constraints before proceeding further.…”

“…2. The same figure includes the condition imposed by inequality (22). Furthermore, for each pair of values of R and co and a selection of wire materials (Os), the working equations (6) and (8) permit the determination of the corresponding decrement which should lie within the range defined by inequality (23).…”

“…Measurements of the viscosity of n-heptane have been carried out by Kashiwagi and Makita with a quartz-crystal viscometer [22], Assael and Papadaki [3] in the low-pressure viscometer described here, and Knapstad et al at saturation with an oscillating-cylinder viscometer [19]. Figures 6-8 show the deviations between the various sets of results and a representation of the data obtained with the high-pressure viscometer.…”

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

“…From these deviations, we can also conclude that the experimental data are internally consistent to within the estimate experimental uncertainty. Equation (16) Figure 7, we compare the new results with data from the literature [13][14][15][16][17][18][19] at pressures up to 10 MPa as deviations from the correlation of Tariq et al 1 Our results agree well with the majority of the experimental data reported in the literature; however, the data of Rajagapol et al 17 at temperatures below 400 K and those of Grachev et al 19 to constrain the behavior of their correlation in the liquid state at temperatures above 441 K and those data are systematically higher than ours at temperatures above 450 K. Figure 8 compares our new results with data from the literature 13,14,[20][21][22][23][24][25][26][27][28][29] at pressure up to 10 MPa as deviations from the correlation of Huber et al 2,3 At temperatures up to 500 K, our new data agree with the correlation to within about ±1 %, which is the stated uncertainty of the correlation for the saturated liquid. At higher temperatures, the deviations are somewhat dependent upon pressure and span the interval (-3 to -6) %.…”