Experimental and modeling investigation on surface tension and surface properties of (CH 4  + H 2 O), (C 2 H 6  + H 2 O), (CO 2  + H 2 O) and (C 3 H 8  + H 2 O) from 284.15 K to 312.15 K and pressures up to 60 bar

Khosharay, Shahin; Varaminian, Farshad

doi:10.1016/j.ijrefrig.2014.08.003

Cited by 61 publications

(23 citation statements)

References 37 publications

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“…When we assume  to be about 63 mN m -1 at 7 MPa (from [31]), a bubble with P g = 7 ± 5 MPa would have the diameter from 19 to 126 nm. This is smaller than the average diameter obtained in the present study.…”

Section: Measurements Of Mnb Solutions Via Raman Spectroscopymentioning

confidence: 99%

Generation of micro- and nano-bubbles in water by dissociation of gas hydrates

Uchida

Yamazaki

Gohara

2016

Korean J. Chem. Eng.

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Gas hydrate crystals have a structure in which one molecule is enclathrated in a cage of water molecules.When such a crystal dissociates in water, each enclathrated molecule, generally vapor at standard temperature and pressure, directly dissolves into the water. After the solution is supersaturated, excess gas molecules from further dissociation would start forming small bubbles called micro-and nano-bubbles (MNBs). However, it is difficult to identify such small bubbles dispersed in liquid because they are smaller than a microscope's optical resolution. To confirm the formation of MNBs after gas hydrate dissociation, we used a transmission electron microscope (TEM) to analyze freeze-fracture replicas of CH 4 -hydrate dissociation solution. The TEM images indicate the existence of MNBs in the solution, with a number concentration similar to that from a commercially supplied generator. Raman spectroscopic measurements on the CH 4 -hydrate dissociated solution were then done to confirm that the MNBs contain CH 4 vapor, and to estimate experimentally the inner pressure of the CH 4 MNBs. These results suggest that the dissociation of gas hydrate crystals in water is a simple, effective method to obtain MNB solution. We then discuss how such MNBs may play a key role in the memory effect of gas-hydrate reformation. KeywordsMicrobubble, Nanobubble, gas hydrate dissociation, freeze fracture replica, bubble pressure, memory effect 2

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Section: Measurements Of Mnb Solutions Via Raman Spectroscopymentioning

confidence: 99%

Generation of micro- and nano-bubbles in water by dissociation of gas hydrates

Uchida

Yamazaki

Gohara

2016

Korean J. Chem. Eng.

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“…The phase equilibrium calculations has been performed based on the applied flash calculations in [13,14].…”

Section: The Free Energy Density and Vtpr Eosmentioning

confidence: 99%

“…In recent years, three groups of empirical expressions have been used to determine the influence parameter of the gradient theory: (1) constant influence parameter [6][7][8]; (2) temperature dependent influence parameter [9,10]; (3) the influence parameter based on the densities of the vapor and liquid phases [11][12][13][14][15][16]. The first group makes the theory easer.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, it was concluded that the second group lead to a significant improvement, but it has some limitations, for example, the temperature dependent influence parameter used by Zuo and [9,17,18] is not possible to be applied under supercritical conditions so that the reduced temperature should be set to a single value. In recent years, the third group of influence parameter of the gradient theory [11][12][13][14][15][16] has been successfully applied to refrigerant mixtures and water/gas systems. The third group of influence parameter has shown the potential to overcome the limitations of the first and second groups.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a new correlation based on the densities of the vapor and liquid phases have been proposed. The performance of new suggested influence parameter has been also compared with the previous proposed influence parameter in [11][12][13][14][15][16]. Furthermore, the performance of suggested influence parameter has been discussed.…”

Section: Introductionmentioning

confidence: 99%

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Using a New Proposed Influence Parameter of Gradient Theory for CH4/n-alkane Binary Systems: What Advances Can Be Achieved?

Khosharay¹,

Rezakhani²

2016

Period. Polytech. Chem. Eng.

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Measurements and correlations for gas liquid surface tension at high pressure and high temperature

et al. 2018

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Experimental and modeling investigation on surface tension and surface properties of (CH 4 + H 2 O), (C 2 H 6 + H 2 O), (CO 2 + H 2 O) and (C 3 H 8 + H 2 O) from 284.15 K to 312.15 K and pressures up to 60 bar

Cited by 61 publications

References 37 publications

Generation of micro- and nano-bubbles in water by dissociation of gas hydrates

Generation of micro- and nano-bubbles in water by dissociation of gas hydrates

Using a New Proposed Influence Parameter of Gradient Theory for CH4/n-alkane Binary Systems: What Advances Can Be Achieved?

Measurements and correlations for gas liquid surface tension at high pressure and high temperature

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