High-pressure speed of sound, density and compressibility of heavy normal paraffins: C 28H58 and C 36H 74

Dutour, Sébastien; Lagourette, B.; Daridon, Jean-Luc

doi:10.1006/jcht.2001.0922

Cited by 40 publications

(15 citation statements)

References 18 publications

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“…The experimental scatter from the resonance method cannot confirm the minimum, but our results follow the trend of the prediction within 5% error (Table IV). The value for unfilled paraffin was taken from recent data using a well‐established technique for measuring the speed of sound 39 …”

Section: Resultsmentioning

confidence: 99%

“…The value for unfilled paraffin was taken from recent data using a well-established technique for measuring the speed of sound. 39 In piezoelectric-driven printing heads such as those used in the present work, jetting is controlled by the system (filled with fluid) acoustic response to the mechanical vibration of piezoelectric transducers when stimulated by an externally applied variable electric field. Thus, stable production of droplets requires modifications to the latter in order to account for the change in acoustics induced by the presence of particulate in suspension.…”

Section: Resultsmentioning

confidence: 99%

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Viscosity and Acoustic Behavior of Ceramic Suspensions Optimized for Phase‐Change Ink‐Jet Printing

Reis

Ainsley

Derby

2005

Journal of the American Ceramic Society

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The application of ink‐jet printing technologies to direct‐write and freeform fabrication of ceramics requires the development of appropriate printing fluids. The critical parameter controlling fluid printing ability is viscosity, although surface tension and density are also important. Additionally, in piezoelectric‐driven ink‐jets, drop ejection is governed by a series of electric pulses exciting a transducer at acoustic frequencies and hence the fluid acoustic wave speed is also important. Here, suspensions of sterically stabilized fine ceramic powders in solidifying hydrocarbon systems exhibiting suitable rheology for ink‐jet printing have been formulated and their acoustic behavior has been characterized. For the particle sizes and frequencies used in this study, acoustic wave speed as a function of solids content is accurately predicted by effective medium theory. Suspensions containing up to 45% particulate by volume can be successfully passed through conventional printing heads.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Viscosity and Acoustic Behavior of Ceramic Suspensions Optimized for Phase‐Change Ink‐Jet Printing

Reis

Ainsley

Derby

2005

Journal of the American Ceramic Society

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“…For n-C 12 H 26 , the densities of the liquid and vapor phases have been adopted from the equation of state of Lemmon and Huber. 31 Data for the dynamic viscosity of the vapor phase are calculated from a pure fluid model according to Huber et al 32 For n-C 28 H 58 , the liquid density was employed from a correlation of Dutour et al 33 based on their experimental data measured between 353.15 and 403.15 K at atmospheric pressure with a U-tube densimeter. The uncertainty of the measurement results is not specified but can be estimated to be 0.1%.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Liquid Viscosity and Surface Tension of n-Dodecane, n-Octacosane, Their Mixtures, and a Wax between 323 and 573 K by Surface Light Scattering

et al. 2017

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The present contribution provides experimental data for the liquid viscosity and surface tension of n-alkane based model systems at temperatures up to 573 K. The fundamental advantage of the used surface light scattering (SLS) method lies in its application in thermodynamic equilibrium without calibration in a contactless way. The investigated systems comprise the pure fluids n-dodecane (n-C 12 H 26 ) and n-octacosane (n-C 28 H 58 ), their binary mixture at a n-C 12 H 26 mole fraction of about 0.3, and the commercially available hydrocarbon wax SX-70 representing a multicomponent mixture of n-alkanes with a broad chain length distribution. For the first time, it could be demonstrated that the SLS method can simultaneously access the liquid viscosity and surface tension of such medium-to long-chained n-alkane systems close to saturation conditions over a broad temperature range from 323 to 573 K. Typical measurement uncertainties of 2% based on a coverage factor k = 2, i.e., a level of confidence of more than 95%, were obtained. Over the entire temperature range, a simple polynomial equation for the dynamic viscosity and a modified van der Waals equation for the surface tension represent the measured data of the pure and binary systems well. The present investigations improve the data situation for hydrocarbon systems in the high-temperature range where no measurement results exist in literature.

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“…16,59 The vapor pressure and saturated liquid density data is taken from the DIPPR correlations 50 in the reduced temperature range [0.45, 0.9] for consistency and easy comparison with other models, while the speed of sound data of methane to n-decane is taken from the NIST database, 51 and those of other long chain molecules are taken from the literature. [52][53][54][55][56][57][58]60,61 The typical shapes of the constant temperature speed of sound curves from the three models are shown in Figures 1−3, from which it can be seen that sPC-SAFT performs better on capturing the curvature, although SRK or CPA have a better % AAD in narrow low pressure ranges for some cases, such as hexane at 300 K in Figure 2. This is because the cancellation of the errors from the underpredicted to overpredicted regions.…”

Section: Modelsmentioning

confidence: 99%

Approach to Improve Speed of Sound Calculation within PC-SAFT Framework

Liang

Maribo-Mogensen

Thomsen

et al. 2012

Ind. Eng. Chem. Res.

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An extensive comparison of SRK, CPA, and PC-SAFT for the speed of sound in normal alkanes has been performed. The results reveal that PC-SAFT captures the curvature of the speed of sound better than cubic EoS, but the accuracy is not satisfactory. Two approaches have been proposed to improve PC-SAFT's accuracy for speed of sound: (i) putting speed of sound data into parameter estimation; (ii) putting speed of sound data into both universal constants regression and parameter estimation. The results have shown that the second approach can significantly improve the speed of sound (3.2%) prediction while keeping acceptable accuracy for the primary properties, i.e. vapor pressure (2.1%) and liquid density (1.5%). The two approaches have also been applied to methanol, and both give very good results.

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High-pressure speed of sound, density and compressibility of heavy normal paraffins: C 28H58 and C 36H 74

Cited by 40 publications

References 18 publications

Viscosity and Acoustic Behavior of Ceramic Suspensions Optimized for Phase‐Change Ink‐Jet Printing

Viscosity and Acoustic Behavior of Ceramic Suspensions Optimized for Phase‐Change Ink‐Jet Printing

Liquid Viscosity and Surface Tension of n-Dodecane, n-Octacosane, Their Mixtures, and a Wax between 323 and 573 K by Surface Light Scattering

Approach to Improve Speed of Sound Calculation within PC-SAFT Framework

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