Surface tension of ethane–methane solutions: 1. Experiment and thermodynamic analysis of the results

Байдаков, В. Г.; Kaverin, A. M.; Khotienkova, Maria N.

doi:10.1016/j.fluid.2013.07.008

Cited by 31 publications

(13 citation statements)

References 14 publications

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“…The measured surface tension of liquid methane is ∼20 mN/m at Titan's surface temperature (Baidakov et al, 2013). We used this value to make theoretical predictions of capillary forces for liquid methane (equation (15)).…”

Section: 1002/2017je005437mentioning

confidence: 99%

Direct Measurement of Interparticle Forces of Titan Aerosol Analogs (“Tholin”) Using Atomic Force Microscopy

Hörst

et al. 2017

JGR Planets

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To understand the origin of the dunes on Titan, it is important to investigate the material properties of Titan's organic sand particles on Titan. The organic sand may behave distinctively compared to the quartz/basaltic sand on terrestrial planets (Earth, Venus, and Mars) due to differences in interparticle forces. We measured the surface energy (through contact angle measurements) and elastic modulus (through Atomic Force Microscopy) of the Titan aerosol analog (tholin). We find that the surface energy of a tholin thin film is about 70.9 mN/m, and its elastic modulus is about 3.0 GPa (similar to hard polymers like PMMA and polystyrene). For two 20 μm diameter particles, the theoretical cohesion force is therefore 3.3 μN. We directly measured interparticle forces for relevant materials: tholin particles are 0.8 ± 0.6 μN, while the interparticle cohesion between walnut shell particles (a typical model materials for the Titan Wind Tunnel, TWT) is only 0.4 ± 0.1 μN. The interparticle cohesion forces are much larger for tholins and presumably Titan sand particles than materials used in the TWT. This suggests that we should increase the interparticle force in both analog experiments (TWT) and threshold models to correctly translate the results to real Titan conditions. The strong cohesion of tholins may also inform us how the small aerosol particles (∼1 μm) in Titan's atmosphere are transformed into large sand particles (∼200 μm). It may also support the cohesive sand formation mechanism suggested by Rubin and Hesp (2009), where only unidirectional wind is needed to form linear dunes on Titan.

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Section: 1002/2017je005437mentioning

confidence: 99%

Direct Measurement of Interparticle Forces of Titan Aerosol Analogs (“Tholin”) Using Atomic Force Microscopy

Hörst

et al. 2017

JGR Planets

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“…The bulk STs of four binary mixtures of the CO 2 – n C 4 , N 2 –C 1 , N 2 –O 2 , C 1 –C 2 , and one ternary mixture of the N 2 –O 2 –Ar are calculated from the new correlation at different temperatures and feed ratios, which are compared with the experimental results in Figure and Tables S2–S5 in the Supporting Information. In Figure , the measured and calculated bulk STs of the CO 2 – n C 4 mixture at three temperatures of T = 319.3, 344.3, and 377.6 K and different feed CO 2 mole fractions are shown.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, O 2 , Ar, CO 2 , N 2 , and alkanes of C 1 –C 10 are used, whose critical temperature, pressure, and volume, Lennard‐Jones potential parameters, and modified van der Waals equation of state (EOS) constants are summarized in Table . The STs of the 15 pure components of the O 2 , Ar, CO 2 , N 2 , C 1 –C 10 , four binary mixtures of the CO 2 – n C 4 , N 2 –C 1 , N 2 –O 2 , C 1 –C 2 , and one ternary mixture of the N 2 –O 2 –Ar at different temperatures in bulk phase were experimentally measured in the previous studies and referred in this study. Moreover, the measured STs of the pure components of the C 1 , C 2 , C 3 , nC 4 , and C 8 at different temperatures and r p = 1.5 nm are also summarized .…”

Section: Methodsmentioning

confidence: 99%

Semi‐analytical nanoscale‐extended surface tension correlation

2019

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Surface tensions (STs) are of critical importance to numerous natural phenomena and practical applications while most existing ST correlations are in the empirical formulations and limited to the bulk phase. In this study, a new semi-analytical correlation based on the perturbation theory from the statistical thermodynamics is initially developed to calculate the STs of the various components in bulk and nanoconfined pores. The newly developed ST correlation is validated to be accurate and generalized in bulk and nanoconfined pores in comparison with the experimentally measured results at a wide range of temperatures. Furthermore, three important patterns with respect to the STs are determined: first, the STs are found to be reduced with the temperature increase but increase when the components become heavier in both bulk and nanoconfined pores; second, the STs of the mixtures tend to be more sensitive to the feed ratios at higher temperatures; last but not least, the nanoscale STs of the pure components are slightly lower than the bulk results at the same conditions.

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“…Additionally, Carey et al [20] firstly combined the density gradient theory with the cubic equation of state to determine the surface tension of pure fluid, which expanded the application scope of density gradient theory [21,22]. In terms of the measurement of the surface tension, recently, Wang [23] studied the surface tension of the organosilicone surfactant as foam extinguishing agent by orthogonal experiments, while Baidakov et al [24][25][26] tested the surface tension of the mixed solutions of nitrogen-methane, nitrogen-ethane and methane-ethane in the temperature ranging from 95 K to 170 K, 93 K to 283 K and 93 K to 283 K, respectively. Dinenno et al [27] and Yang et al [3,28] proposed mathematical models to analyze the release process of the fire extinguishing agent in bottles.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the release process of the nitrogen-extinguishant binary mixture considering surface tension

Liu

Xie

Chen

et al. 2020

J Therm Anal Calorim

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Nitrogen used for pressurization in the extinguisher can be partially dissolved in the fire extinguishing agent. Consequently, the evolution of the dissolved nitrogen has a significant effect on the release behavior of the fire extinguishing agent in a rapid process. In this article, a new model was developed to predict the critical pressure of the nitrogen evolution and the release process of the fire extinguishing agent was described in detail. According to the Peng-Robinson (PR) equation of state and van der Waals mixing rule, the effect of the dissolved nitrogen on the surface tension of the fire extinguishant was analyzed by considering surface phase and fugacity coefficient. A method to calculate the surface tension of the liquid agent dissolved with nitrogen was proposed. The results showed that the proposed model can determine the accurate critical pressure of the evolution of the dissolved nitrogen and further evaluated whether nitrogen escapes. At different initial filling pressure, in addition, the release process of the nitrogen-extinguishant such as CF3I, FC218 (C3F8), HFC125 (C2HF5), and Halon1301 (CF3Br) was well predicted by the fluid release model when taking the surface tension and adiabatic index of the mixture into account. Compared with the previously obtained experimental data, the predictions obtained indicated that the present model can adequately describe the liquid and the gas mixture release stage in the release process of the nitrogenextinguishant.

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Surface tension of ethane–methane solutions: 1. Experiment and thermodynamic analysis of the results

Cited by 31 publications

References 14 publications

Direct Measurement of Interparticle Forces of Titan Aerosol Analogs (“Tholin”) Using Atomic Force Microscopy

Direct Measurement of Interparticle Forces of Titan Aerosol Analogs (“Tholin”) Using Atomic Force Microscopy

Semi‐analytical nanoscale‐extended surface tension correlation

Prediction of the release process of the nitrogen-extinguishant binary mixture considering surface tension

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