Untitled

Temperature and pressure dependences of volumetric properties of two poly(propylene glycol) dimethyl ether lubricants

“…The average absolute relative deviations between our density data for toluene and those previously reported by Cibulka and Takagi [33], Masui [34], NIST (REFPROP equation) [35], Ihmels and Gmehling [36], and Assael et al with some of their data. In figure 1, it can be seen that the deviations found in this work are similar to those usually indicated in articles concerning experimental density studies of fluids in broad ranges of pressure, even for low viscous fluids.…”

“…Ciotta et al[44] indicate that the density uncertainty of their vibrating wire instrument increased rapidly from (0.2 to 0.8)% when the viscosity of the liquid is higher than 30 mPa Á s. In our opinion this is the reason of the large deviations obtained Relative deviations between the density values obtained in this work and different literature data. (a) Toluene: (h) Cibulka and Takagi[33], (s) Masui[34], (e) NIST (REFPROP equation)[35], (4) Ihmels and Gmehling[36], and (+) Assael et al[37] (b) Squalane: (h) Fandiño et al[39,40], (s) Kumagai et al[41], (4) Kuss and Taslimi[38], (e) Tomida et al[42], (+) Fermeglia and Torriano[43] and (Ã) Ciotta et al[44].…”

Measurement and correlation of the (p,ρ,T) relation of liquid cyclohexane, toluene, and ethanol in the temperature range from 233.15 K to 473.15 K at pressures up to 30 MPa for use as density reference liquids

“…[31], Avelino et al[32], and Masui[33] show scatterings and sys-tematic deviations from the measurements of this work. The values of Straty et al deviate between about À0.25% and 0.15% from our results, the values of Avelino et al deviate between about 0.06% and 0.19%, and the data of Masui between about À0.05% and 0.10%.…”

“…Percentage density deviations of experimental (p, q, T) values of toluene from values q calc calculated from the correlation equation (1). +, this work; d, Straty et al [31]; h, Avelino et al [32]; 4, Masui [33]; N, Muringer et al [34]; }, Magee and Bruno [35]; Â, Ihmels and Gmehling [36]; s, McLinden and Splett [26]; -ÁÁ -ÁÁ -, phase boundary (vapour + liquid); ---, values calculated from the equation of state of Lemmon and Span [19], -Á -Á -, values calculated from the equation of state of Goodwin [37], and Á Á Á, values calculated from the equation of state of Polt et al [38] are plotted for comparison. The uncertainty of the density measurements of this work was estimated to be 0.015% (k = 2), see Section 3.2. same comparisons but versus temperature, and the pressure range given above each diagram corresponds to the measurements plotted in this diagram.…”

“…A comparison of the new (p, q, T) values of toluene with the measurements of seven other experimental groups [26,[31][32][33][34][35][36] is presented in figures 5 and 6 in three deviation diagrams. In figure 5, the diagrams show the deviations between measured values and values calculated from equation (1) versus pressure.…”