Limits...
New observations and insights into the morphology and growth kinetics of hydrate films.

Li SL, Sun CY, Liu B, Li ZY, Chen GJ, Sum AK - Sci Rep (2014)

Bottom Line: The kinetics of two-dimensional film growth was inferred from the lateral growth rate and initial thickness of the hydrate film.A clear relationship between the morphology and film growth kinetics was observed.The quantitative results on the kinetics of film growth showed that for a given degree of subcooling, the initial film thicknesses of the double hydrates were larger than that of pure methane or ethane hydrate, whereas the thickest hydrate film and the lowest lateral growth rate occurred when the methane mole fraction was approximately 0.6.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China.

ABSTRACT
The kinetics of film growth of hydrates of methane, ethane, and methane-ethane mixtures were studied by exposing a single gas bubble to water. The morphologies, lateral growth rates, and thicknesses of the hydrate films were measured for various gas compositions and degrees of subcooling. A variety of hydrate film textures was revealed. The kinetics of two-dimensional film growth was inferred from the lateral growth rate and initial thickness of the hydrate film. A clear relationship between the morphology and film growth kinetics was observed. The shape of the hydrate crystals was found to favour heat or mass transfer and favour further growth of the hydrate film. The quantitative results on the kinetics of film growth showed that for a given degree of subcooling, the initial film thicknesses of the double hydrates were larger than that of pure methane or ethane hydrate, whereas the thickest hydrate film and the lowest lateral growth rate occurred when the methane mole fraction was approximately 0.6.

No MeSH data available.


Related in: MedlinePlus

Initial hydrate film thickness measured for different degrees of subcooling and hydrate forming gases.Solid lines denote the results calculated from the correlation δ = k/ΔT.
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f4: Initial hydrate film thickness measured for different degrees of subcooling and hydrate forming gases.Solid lines denote the results calculated from the correlation δ = k/ΔT.

Mentions: The lateral growth rate (vf) and initial thickness (δ) of the hydrate film measured at 278.0 K are shown in Tables S1 and S2 (see the Supporting Material) and are plotted in Figures 3 and 4. The lateral growth rate and initial thickness are calculated from the correlations proposed by Peng et al.19 The lateral growth rate is correlated with , where ψ is a lateral growth rate parameter and ΔT is the degree of subcooling. For the initial hydrate film thickness, the correlation is δ = k/ΔT, where k is the inversely proportional coefficient. As shown in Figures 3 and 4, there is very good agreement between the experimental data and correlations.


New observations and insights into the morphology and growth kinetics of hydrate films.

Li SL, Sun CY, Liu B, Li ZY, Chen GJ, Sum AK - Sci Rep (2014)

Initial hydrate film thickness measured for different degrees of subcooling and hydrate forming gases.Solid lines denote the results calculated from the correlation δ = k/ΔT.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3928615&req=5

f4: Initial hydrate film thickness measured for different degrees of subcooling and hydrate forming gases.Solid lines denote the results calculated from the correlation δ = k/ΔT.
Mentions: The lateral growth rate (vf) and initial thickness (δ) of the hydrate film measured at 278.0 K are shown in Tables S1 and S2 (see the Supporting Material) and are plotted in Figures 3 and 4. The lateral growth rate and initial thickness are calculated from the correlations proposed by Peng et al.19 The lateral growth rate is correlated with , where ψ is a lateral growth rate parameter and ΔT is the degree of subcooling. For the initial hydrate film thickness, the correlation is δ = k/ΔT, where k is the inversely proportional coefficient. As shown in Figures 3 and 4, there is very good agreement between the experimental data and correlations.

Bottom Line: The kinetics of two-dimensional film growth was inferred from the lateral growth rate and initial thickness of the hydrate film.A clear relationship between the morphology and film growth kinetics was observed.The quantitative results on the kinetics of film growth showed that for a given degree of subcooling, the initial film thicknesses of the double hydrates were larger than that of pure methane or ethane hydrate, whereas the thickest hydrate film and the lowest lateral growth rate occurred when the methane mole fraction was approximately 0.6.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China.

ABSTRACT
The kinetics of film growth of hydrates of methane, ethane, and methane-ethane mixtures were studied by exposing a single gas bubble to water. The morphologies, lateral growth rates, and thicknesses of the hydrate films were measured for various gas compositions and degrees of subcooling. A variety of hydrate film textures was revealed. The kinetics of two-dimensional film growth was inferred from the lateral growth rate and initial thickness of the hydrate film. A clear relationship between the morphology and film growth kinetics was observed. The shape of the hydrate crystals was found to favour heat or mass transfer and favour further growth of the hydrate film. The quantitative results on the kinetics of film growth showed that for a given degree of subcooling, the initial film thicknesses of the double hydrates were larger than that of pure methane or ethane hydrate, whereas the thickest hydrate film and the lowest lateral growth rate occurred when the methane mole fraction was approximately 0.6.

No MeSH data available.


Related in: MedlinePlus