Automated densimetric system: Measurements and uncertainties for compressed fluids

Segovia, José J.; Fandiño, Olivia; López, Enriqueta R.; Lugo, Luis; Martín, M. Carmen; Fernández, Josefa

doi:10.1016/j.jct.2008.12.020

Cited by 125 publications

(124 citation statements)

References 50 publications

(90 reference statements)

Supporting

Mentioning

114

Contrasting

Order By: Relevance

“…This is probably due to a significant increase in the viscosity of the biodiesel. Using the same technique as in this work, Segovia et al [22] claim that the uncertainty depends on the experimental ranges, increasing up to 5 kg·m −3 for highly viscous fluids. Such an increase is explained by the damping effect on the densimeter cell.…”

Section: T (K)mentioning

confidence: 81%

Density Measurements of Waste Cooking Oil Biodiesel and Diesel Blends Over Extended Pressure and Temperature Ranges

2018

View full text Add to dashboard Cite

Density and compressibility are primordial parameters for the optimization of diesel engine operation. With this objective, these properties were reported for waste cooking oil biodiesel and its blends (5% and 10% by volume) mixed with diesel. The density measurements were performed over expanded ranges of pressure (0.1 to 140 MPa) and temperature (293.15 to 353.15 K) compatible with engine applications. The isothermal compressibility was estimated within the same experimental range by density differentiation. The Fatty Acid Methyl Esters (FAMEs) profile of the biodiesel was determined using a Gas Chromatography-Mass Spectrometry (GC-MS) technique. The storage stability of the biodiesel was assessed in terms of the reproducibility of the measured properties. The transferability of this biodiesel fuel was discussed on the basis of the standards specifications that support their use in fuel engines. Additionally, this original set of data represents meaningful information to develop new approaches or to evaluate the predictive capability of models previously developed.

show abstract

Section: T (K)mentioning

confidence: 81%

Density Measurements of Waste Cooking Oil Biodiesel and Diesel Blends Over Extended Pressure and Temperature Ranges

2018

View full text Add to dashboard Cite

show abstract

“…A correction can easily be performed if the form of the error curve and the sample viscosity are known [Aschcroft et al, (1990), Stabinger, (1994 and Fitzgerald, (1992)]. In the present work the viscosity correction (ρ HPM -ρ)/ρ HPM (Segovia et al, 2009) The mPDS2000V3 control unit measures the vibration period with an accuracy of Δτ = ±0.001 μs. According to the specifications of Anton-Paar and the calibration procedures, the observed repeatability of the density measurements at temperatures T = (273.15 to 413.15) K and pressures up to p = 140 MPa was within Δρ = ±(0.1 to 0.3) kg·m −3 or Δρ/ρ = ±(0.01 to 0.03)%.…”

Section: Methodsmentioning

confidence: 96%

Thermophysical Properties of 1-Butyl-3-Methylimidazolium Bis(trifluoromethylsulfonyl)imide at High Temperatures and Pressures

Hamidova

Kul

Safarov

et al. 2015

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-Pressure-density-temperature (p,ρ,T) data of the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [BMIM][NTf 2 ] at T = (273.15 to 413.15) K and pressures up to p =140 MPa are reported with an estimated experimental relative combined standard uncertainty of Δρ/ρ = ±(0.01 to 0.08)% in density. The measurements were carried out with a newly constructed Anton-Paar DMA HPM vibration-tube densimeter. The system was calibrated using double-distilled water, aqueous NaCl solution, methanol, toluene and acetone. An empirical equation of state for fitting the (p,ρ,T) data of [BMIM][NTf 2 ] has been developed as a function of pressure and temperature. This equation is used for the calculation of the thermophysical properties of the ionic liquid, such as isothermal compressibility, isobaric thermal expansibility, thermal pressure coefficient, internal pressure, isobaric and isochoric heat capacities, speed of sound and isentropic expansibility.

show abstract

“…Both the complete equipment and the experimental procedure have been described in detail in a previous article [33]. Taking into account the uncertainties of the temperature, the pressure, the period of oscillation measurements, the water density, and the additional uncertainty that results from the density corrections because of the sample viscosity, the total uncertainty of our density measurements is estimated to be 0.7 kg m -3 for temperatures lower than 373.15 K [34] and 0.8 kg m -3 for higher temperatures [35].…”

Section: Densitymentioning

confidence: 99%

Pressure–Viscosity Coefficients for Polyalkylene Glycol Oils and Other Ester or Ionic Lubricants

et al. 2011

View full text Add to dashboard Cite

We present in this article new viscosity and density data for polypropylene glycol monomethyl ether, which completes a series of articles where we have published dynamic viscosity data of poly(propylene glycol) dimethyl ethers, dipentaerythritol esters, and pentaerythritol esters. New dynamic viscosity measurements up to 60 MPa at five temperatures in the range of 303.15-373.15 K, and density values at temperatures ranging from 298.15 to 398.15 K up to 60 MPa are reported in addition to other physical properties that affect the behavior of the fluids in elastohydrodynamic lubrication regime, such as the viscosity index value, VI, the universal pressure-viscosity coefficient, a film , and the temperature-viscosity coefficient, b. The experimental measurements were performed using a rotational automated viscometer Anton Paar Stabinger SVM3000, a rolling-ball viscometer Ruska 1602-830 for high pressures, and an automated Anton Paar DMA HPM vibrating-tube densimeter. Together with these data, we also present a comparison of the film-generating capability for the fluids above mentioned as well as for other five ionic liquids. We analyze the dependence of the molecular structure on the lubrication properties of these oils, which can help the lubricant engineers to develop products with enhanced performance.

show abstract

Automated densimetric system: Measurements and uncertainties for compressed fluids

Cited by 125 publications

References 50 publications

Density Measurements of Waste Cooking Oil Biodiesel and Diesel Blends Over Extended Pressure and Temperature Ranges

Density Measurements of Waste Cooking Oil Biodiesel and Diesel Blends Over Extended Pressure and Temperature Ranges

Thermophysical Properties of 1-Butyl-3-Methylimidazolium Bis(trifluoromethylsulfonyl)imide at High Temperatures and Pressures

Pressure–Viscosity Coefficients for Polyalkylene Glycol Oils and Other Ester or Ionic Lubricants

Contact Info

Product

Resources

About