Gas hydrate growth morphology outside of horizontal heat transfer tube

Xie, Yongqi; Guo, Kaihua; Liang, Deqing; Fan, Shuanshi; Gu, Junjie

doi:10.1016/j.jcrysgro.2004.11.346

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…This is called the memory effect. Xie et al 29 reported the continuous nucleation and formation of an agglomerate of polycrystalline hydrates of HCFC-141b without formation of a hydrate film, using meltwater containing a promoter (sodium dodecyl sulfate). Zeng et al 22 reported that the memory effect works for nucleation of THF hydrates.…”

Section: Mechanism Of Growth Mode Transitionmentioning

confidence: 99%

Growth Mode Transition of Tetrahydrofuran Clathrate Hydrates in the Guest/Host Concentration Boundary Layer

Sabase

Nagashima

2009

J. Phys. Chem. B

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Clathrate hydrates are known to form a thin film along a guest/host boundary. We present here the first report of tetrahydrofuran (THF) clathrate hydrate formation in a THF/water concentration boundary layer. We found that the THF-water system also forms a hydrate film separating the guest/host phases. The lateral growth rate of the film increases as supercooling increases. The thickness of the film at the growth tip decreases as supercooling and the lateral growth rate increase. These tendencies are consistent with reports of experiments for other hydrates and predictions of heat-transfer models. After film formation and slight melting, two types of growth modes are observed, depending on temperature T. At T ) 3.0 °C, the film slowly thickens. The thickening rate is much lower than the lateral growth rate, as reported for other hydrates. At T e 2.0 °C, however, the growth mode transitions spontaneously from film growth to continuous nucleation, and an agglomerate of small polycrystalline hydrates forms in each phase. Grain boundaries in the film and pore spaces in the agglomerate act as paths for permeation of each liquid. Timing when continuous nucleation starts is dominantly controlled by the time of initiation of liquid permeation through the film. Digital particle image velocimetry analysis of the agglomerate shows that it expands not by growth at the advancing front but rather by continuous nucleation in the interior. Expansion rates of the agglomerate tend to be higher for the cases of multipermeation paths in the film and the thinner film. We suppose that the growth mode transition to continuous nucleation is caused by the memory effect due to slight melting of the hydrate film.

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Section: Mechanism Of Growth Mode Transitionmentioning

confidence: 99%

Growth Mode Transition of Tetrahydrofuran Clathrate Hydrates in the Guest/Host Concentration Boundary Layer

Sabase

Nagashima

2009

J. Phys. Chem. B

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“…), mixing speed, and the degree of subcooling (i.e., the difference between the equilibrium and process temperatures) can significantly affect the onset of nucleation and the magnitude of hydrate growth. For example, Boysen et al [ 35 ] and Xie et al [ 36 ] investigated the effect of nucleating agents to reduce the onset of nucleation. The use of a nucleating agent (Snowmax R ) in a preceding study drastically reduced the final salinity of the seawater solution (salt removal efficiency with a nucleating agent: 90%, and without nucleating agent: 74.2%).…”

Section: Recent Developments In Hydrate‐based Desalination Processesmentioning

confidence: 99%

Current challenges in hydrate‐based desalination: Kinetic and thermodynamic perspective

Khan

Peters

et al. 2022

Can J Chem Eng

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Water scarcity is becoming a severe problem worldwide due to inadequate freshwater resources and swift population growth. Seawater desalination is one of the vital approaches to meet the demand for freshwater. However, energy and associated costs with conventional seawater desalination techniques are incentivizing non-conventional water desalination processes. Water desalination using gas hydrates formation is one of the emerging nonconventional processes. In this perspective article, recent advances in hydratebased seawater desalination (HBSD) have been critically analyzed to outline a future path towards a clean and efficient hydrate-based desalination process. It provides a detailed comparison of various processes developed over decades, and measured desalination efficiencies with their process details. Moreover, the current challenges, limitations, and future perspectives of hydrate-based desalination are also discussed. The study also recapitulates the thermodynamics and kinetics aspects of the hydrate-based desalination process. In addition,

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“…Yutaka [18] found that CO 2 gas hydrate can grow along the solid surface of high polar surface free energy without stirring. Xie [19,20] constructed a set of visual gas hydrate reaction apparatus and researched the gas hydrate formation process outside a single heat transfer tube in a quiescent reactor. It was found that gas hydrates can grow continuously along the heat transfer tube without stirring, from which a novel way for gas hydrate steady formation was presented-gas hydrate fast nucleation from melting ice and quiescent growth along heat transfer tube [21].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on a small scale of gas hydrate cold storage apparatus

Xie

Liu

et al. 2010

Applied Energy

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To have an overall investigation of cold storage characteristics to help to promote the application, a novel small scale of gas hydrate cold storage apparatus was designed. The amount of cold energy, growth rate, Hydrate Packed Factor (HPF) and overall heat transfer coefficient during the cold storage process were calculated and analyzed under different heat exchangers, sodium dodecyl benzene sulfonate (SDS) concentrations, hydration enhancement ways, inlet coolant temperatures and flow rates, etc. Results show that the cold storage performance could be improved greatly by adding a heat exchanger with vertical metal fins; SDS with concentration of 0.04 wt.% could help to improve the cold storage performance effectively. In addition, decreasing of the coolant temperature or increasing of the coolant flow rate could also make the amount of cold storage increased; it was found that mechanical blending for 5 min was the better hydration enhancement way than others, which presents the perspective for practical application.

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Gas hydrate growth morphology outside of horizontal heat transfer tube

Cited by 9 publications

References 8 publications

Growth Mode Transition of Tetrahydrofuran Clathrate Hydrates in the Guest/Host Concentration Boundary Layer

Growth Mode Transition of Tetrahydrofuran Clathrate Hydrates in the Guest/Host Concentration Boundary Layer

Current challenges in hydrate‐based desalination: Kinetic and thermodynamic perspective

Experimental study on a small scale of gas hydrate cold storage apparatus

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