Thermal Diffusion in Methane-n-Butane Mixtures in the Critical Region

“…At higher pressures, however, the Haase and Kempers model expressions work fairly well. Figure 2 shows the experimental data (Rutherford and Roof, 1959) and the prediction of the Haase expression, Eq. (5), for the thermodiffusion factor α of methane-n-butane mixture versus pressure (Eslamian and Saghir, 2009a).…”

Section: Theoretical Studies On Hydrocarbon Mixturesmentioning

confidence: 99%

Advances in Thermodiffusion and Thermophoresis (Soret Effect) in Liquid Mixtures

Eslamian¹

2012

Frontiers in Heat and Mass Transfer

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Recent advances in thermodiffusion (Soret effect) in binary and higher multicomponent liquid mixtures are reviewed. The mixtures studied include the hydrocarbon, associating, molten metal and semiconductor, polymer, and DNA mixtures. The emphasis is placed on the theoretical works, particularly models based on the nonequilibrium thermodynamics, although other approaches such as the statistical, kinetic and hydrodynamic approaches are discussed as well. For each mixture, the major theoretical and experimental works are discussed and the research trends and challenges are addressed. Some of the challenges include a need for combining various methods to develop a comprehensive theoretical model or at least to try to understand the differences and pros and cons of each approach. Thermodiffusion and ordinary diffusion coefficients are scarce in some mixtures such as binary DNA, molten metal and metal-semiconductor mixtures and all ternary mixtures. Understanding of the molecular structure of associating mixtures, and modeling of thermodiffusion in such mixtures are also very challenging.

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“…Thus, the gas separation by the Soret effect inside a mini tube can be completed almost instantaneously. In an earlier study (10) , it was reported that the Soret effect generally required a long time to separating gas components. However, we believe that it would be possible to shorten the separation time using a mini-scale system.…”

Section: Separation Distance In the Mini-tube Systemmentioning

confidence: 99%

Study and Development of a Mini-Tube Gas Separator Utilizing the Soret Effect

Kuwatani

Watanabe

2012

JTST

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The Soret effect is a phenomenon in which a temperature gradient gives rise to a concentration gradient. In this study, we attempted a simple technique for the separation of hydrogen from a gas mixture by utilizing the Soret effect. A gas mixture of hydrogen and carbon dioxide was introduced into a metal mini tube in which a temperature gradient was established in the direction normal to the flow. The experiment demonstrated that hydrogen was actually separated from the gas mixture, although the separation was very small with the present apparatus. From results of the experiments and computational fluid dynamics (CFD) analysis, we believe that the layer of high hydrogen concentration that moved toward the heating wall was very thin. It would be necessary to extract the high concentration of hydrogen flowing near the wall to increase the separation efficiency.

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Thermal Diffusion in Methane-n-Butane Mixtures in the Critical Region

Cited by 50 publications

References 1 publication

Compositional variation in hydrocarbon reservoirs with natural convection and diffusion

Compositional variation in hydrocarbon reservoirs with natural convection and diffusion

Advances in Thermodiffusion and Thermophoresis (Soret Effect) in Liquid Mixtures

Study and Development of a Mini-Tube Gas Separator Utilizing the Soret Effect

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