“… 11 Binodal curves of confined and bulk n C 5 , i C 5 , and neo C 5 . The circles and diamonds are for confined C 5 in a (30, 30) SWNT and a nanoslit from gauge-cell MC, the squares are for bulk C 5 from GEMC, and the dashed curves are for bulk C 5 from experiments. − …”
Capillary phase transitions of linear (from C(1) to C(12)) and branched (C(5) isomers) alkanes in single-walled carbon nanotubes have been investigated using the gauge-cell Monte Carlo simulation. The isotherm at a supercritical temperature increases monotonically with chemical potential and coincides with that from the traditional grand canonical Monte Carlo simulation, whereas the isotherm at a subcritical temperature exhibits a sigmoid van der Waals loop including stable, metastable, and unstable regions. Along this loop, the coexisting phases are determined using an Maxwell equal-area construction. A generic confinement effect is found that reduces the saturation chemical potential, lowers the critical temperature, increases the critical density, and shrinks the phase envelope. The effect is greater in a smaller diameter nanotube and is greater in a nanotube than in a nanoslit.
“… 11 Binodal curves of confined and bulk n C 5 , i C 5 , and neo C 5 . The circles and diamonds are for confined C 5 in a (30, 30) SWNT and a nanoslit from gauge-cell MC, the squares are for bulk C 5 from GEMC, and the dashed curves are for bulk C 5 from experiments. − …”
Capillary phase transitions of linear (from C(1) to C(12)) and branched (C(5) isomers) alkanes in single-walled carbon nanotubes have been investigated using the gauge-cell Monte Carlo simulation. The isotherm at a supercritical temperature increases monotonically with chemical potential and coincides with that from the traditional grand canonical Monte Carlo simulation, whereas the isotherm at a subcritical temperature exhibits a sigmoid van der Waals loop including stable, metastable, and unstable regions. Along this loop, the coexisting phases are determined using an Maxwell equal-area construction. A generic confinement effect is found that reduces the saturation chemical potential, lowers the critical temperature, increases the critical density, and shrinks the phase envelope. The effect is greater in a smaller diameter nanotube and is greater in a nanotube than in a nanoslit.
“…(6)] for the composition dependence of the residual viscosity have been taken from a compilation given by Span and Wagner [41] and the constants for isopentane by Das et al [42]. All the constants are summarized in Table VIII for convenient use together with the η c values for methane and both natural gases.…”
Section: Prediction Of the Residual Viscosity Of Natural Gasmentioning
A vibrating-wire viscometer of very high precision was used to measure the viscosity of methane and of two natural gases. The experimental data were, in general, taken at temperatures of 260, 280, 300, and 320 K and at pressures up to 20 MPa, and additionally in the case of methane at temperatures of 340 and 360 K and at pressures up to 29 MPa. The estimated uncertainty is ±0.3 and ±0.5% for methane and the natural gases, respectively. The new experimental data for methane were used together with zero-density or low-density viscosity values from this study and from the literature to develop a viscosity equation for natural gas composed of two contributions. The mixing rule of Wilke [J. Chem. Phys. 18: 517 1950] was applied for the zero-density viscosity part which is based on zero-density correlations for twelve components (methane, nitrogen, carbon dioxide, ethane, propane, n-and isobutane, n-and isopentane, n-hexane, n-heptane, and n-octane) and agrees with the values derived from experiment within ±0.3%. The density dependence of the residual viscosity part was correlated with methane data only, neglecting any temperature dependence, whereas the composition dependence is characterized by a pseudo-critical viscosity value. For methane the agreement between the correlated and experimental data is within ±0.5%. The values predicted with the correlation and the experimental data agree within ±1% for both the high calorific, H, natural gas and the low calorific, L, natural gas.
“…16, 17, and 18 become for isopentane The required constants for isopentane are T, = 460.39 K, P, = 33.37 atm, V, = 306 cm3/gmol, R = 82.05606 cm3.atm/gmol-K, Z, = 0.270297. Comparison with the data of Das, Reed, and Eubank (1977) shows that the ICL equation is generally not as good up to twice the critical density and reduced temperatures from 0.67 to 1.3. Since the predictions at low pressure are similar, the second virial coefficients will be about alike, as with argon.…”
The cubic‐perturbed, hard‐sphere equation of state proposed in 1980 by Ishikawa, Chung and Lu, has been analyzed by PVT criteria, as contrasted to the single component and multicomponent vapor‐liquid equilibria to which it was applied. The analysis compares its representation of the PVT behavior of substances with that of a simpler equation.
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