An experimental study of gas-hydrate formation by measuring viscosity and infrared spectra

2003 ◽  
Vol 81 (1-2) ◽  
pp. 485-492 ◽  
Author(s):  
H Oyama ◽  
T Ebinuma ◽  
W Shimada ◽  
S Takeya ◽  
J Nagao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Infrared Spectrum ◽  
Infrared Spectra ◽  
Hydrate Formation ◽  
Wave Number ◽  
Gas Hydrate Formation ◽  
Spectrum Change ◽  
Small Wave ◽  
Before And After ◽  
Small Wave Number

We measured the viscosities and infrared (IR) spectra before and after hydrate nucleation. During the induction period, the viscosity increases and the infrared spectrum shifts to higher energy. After nucleation, the viscosity decreases abruptly, and the peak positions in the IR spectrum change to the small wave-number side. These results indicate that water acts as a precursor to hydrate nucleation. PACS Nos.: 66.20td, 78.30.30-j, 64.60Qb

Universality hypothesis for the small wave-number range of decaying turbulence

1995 ◽  
Vol 45 (6) ◽  
pp. 517-520
Author(s):  
L. Ts. Adzhemyan ◽  
M. Hnatich ◽  
M. Stehlik
Keyword(s):  
Wave Number ◽  
Number Range ◽  
Wave Number Range ◽  
Small Wave ◽  
Small Wave Number ◽  
Decaying Turbulence

Experimental study of carbon dioxide gas hydrate formation in the presence of zwitterionic compounds

2019 ◽  
Vol 137 ◽  
pp. 94-100
Author(s):  
Marek Królikowski ◽  
Marta Królikowska ◽  
Hamed Hashemi ◽  
Paramespri Naidoo ◽  
Deresh Ramjugernath ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Experimental Study ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Carbon Dioxide Gas ◽  
Gas Hydrate Formation

The scattering of acoustic waves by a spherically stratified inhomogeneous medium

1977 ◽  
Vol 76 (4) ◽  
pp. 345-350 ◽  
Author(s):  
David Colton
Keyword(s):  
Inhomogeneous Medium ◽  
Acoustic Waves ◽  
Index Of Refraction ◽  
Wave Number ◽  
Direct And Inverse Problems ◽  
Large Index ◽  
Small Wave ◽  
Small Wave Number ◽  
Limiting Case ◽  
Scattering Of Acoustic Waves

SynopsisIntegral operators are used to solve the direct and inverse problems of the scattering of acoustic waves by a spherically stratified inhomogeneous medium of compact support. The results are valid for all values of the wave number and an arbitrarily large index of refraction. In the limiting case of small wave number or small inhomogeneities the results are in agreement with those of Rorres and Born.

Experimental Study on Gas Production from Methane Hydrate Bearing Sand by Depressurization

2013 ◽  
Vol 310 ◽  
pp. 28-32
Author(s):  
Jian Ye Sun ◽  
Yu Guang Ye ◽  
Chang Ling Liu ◽  
Jian Zhang
Keyword(s):  
Experimental Study ◽  
Methane Hydrate ◽  
Hydrate Formation ◽  
Gas Production ◽  
Decomposition Kinetics ◽  
Dissociation Process ◽  
Hydrate Dissociation ◽  
Gas Hydrate Formation ◽  
Experimental Apparatus ◽  
Hydrate Saturation

The simulate experiments of gas production from methane hydrates reservoirs was proceeded with an experimental apparatus. Especially, TDR technique was applied to represent the change of hydrate saturation in real time during gas hydrate formation and dissociation. In this paper, we discussed and explained material transformation during hydrate formation and dissociation. The hydrates form and grow on the top of the sediments where the sediments and gas connect firstly. During hydrates dissociation by depressurization, the temperatures and hydrate saturation presented variously in different locations of sediments, which shows that hydrates dissociate earlier on the surface and outer layer of the sediments than those of in inner. The regulation of hydrates dissociation is consistent with the law of decomposition kinetics. Furthermore, we investigated the depressurizing range influence on hydrate dissociation process.

Pseudo-lattice vibrations in smectic phase of liquid crystals: studies on small wave number Raman spectra of 4-alkyl-4′-cyanobiphenyl

2000 ◽  
Vol 253 (2-3) ◽  
pp. 331-337 ◽  
Author(s):  
Hideyuki Nakayama ◽  
Yukiko Minagawa ◽  
Chihiro Abematsu ◽  
Sachiko Yajima ◽  
Kikujiro Ishii
Keyword(s):  
Liquid Crystals ◽  
Raman Spectra ◽  
Smectic Phase ◽  
Wave Number ◽  
Lattice Vibrations ◽  
Small Wave ◽  
Small Wave Number
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