Separation of a Gas Mixture Flowing through a Long Tube at Low Pressure

Present, R. D.; deBethune, Andre J.

doi:10.1103/physrev.75.1050

Cited by 78 publications

(27 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Of the separation theories presently available, the Present and deBethune theory [1] generally predicts separation results sdmewhat lower than those which are measured. A calculation method by Malling [2], which is based on the flow equations of Lund and Berman [3] and is called the_ general capillary separation theory, generally predicts separation results higher than those of the Present and deBethune theory.…”

Section: Discussionmentioning

confidence: 85%

“…He assumed that the total gas transport in a long capillary is given at all pressures by the addition of (1) G) • EXPERIMENTAL DATA [19].…”

Section: Transition Flowmentioning

confidence: 99%

“…A great deal of both theoretical and experimental work ensued. Present and deBethune [1] and Bosanquet [24], working independently, developed a theory for the separation of gases flowing through uniform capillaries. Bosanquet used an approach based on generalized diffusion coefficients, and Present and deBethune.used an approach based on momentum transfer.…”

Section: Binary Separationmentioning

confidence: 99%

“…In the theory developed by Present and deBethune [1] the flow rate is assumed to be the sum of two terms. One term represents the free molecule or.Knudsen flow and the other represents the viscous or Poiseuille flow.…”

Section: Mathematical Models Present and Debethune Model (Pbm)mentioning

confidence: 99%

“…a mixture can be partially separated by passing the gas mixture through a porous material if the dimensions of the openings in-the material are small in comparison to the mean free path of the gas molecules. About 25 years ago, R. D. Present and A. J. deBethune [1] developed a theory for the separation of a binary gas mixture flowing through circular capillaries. Until now, there has been no definitive data which could be used to check the theory of Present and deBethune.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Neon isotope separation by gaseous diffusion transport in the transition flow regime with regular geometries

Fain¹,

Brown²

1974

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 85%

“…He assumed that the total gas transport in a long capillary is given at all pressures by the addition of (1) G) • EXPERIMENTAL DATA [19].…”

Section: Transition Flowmentioning

confidence: 99%

Section: Binary Separationmentioning

confidence: 99%

Section: Mathematical Models Present and Debethune Model (Pbm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Neon isotope separation by gaseous diffusion transport in the transition flow regime with regular geometries

Fain¹,

Brown²

1974

View full text Add to dashboard Cite

Diffusion Separation Methods

Halle¹,

Shacter

2000

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Diffusion separation methods refer collectively to processes such as gaseous diffusion and gas centrifugation, developed specifically for difficult separations such as those involving the isotopes of uranium. These processes, used worldwide primarily for uranium enrichment, are based on the differences that exist in the rates of gaseous diffusion of the particular isotopes. These difficult separations almost always involve an aggregation of separation units known as a casade. Casade design, unit separative capacity, ideal and real casades, and various separation factors are presented. Equipment and plant design for the enrichment of uranium‐235 by gaseous diffusion, by various pressure diffusion processes, and by jet diffusion, also known as the separation nozzle process, is discussed.

show abstract

Mass transport in porous materials under combined gradients of composition and pressure

Gunn

King

1969

AIChE Journal

View full text Add to dashboard Cite

= local radius, cm. rf = reduced radius ( r / R ) , dimensionless R = Boltzman constant (cal./mole/"K.) or pipe radius S = strain rate, -du/dx (--du/dr for tube flow), T = absolute temperature, O K . Tf u w z = axial coordinate, cm. (cm.1 sec.-l = reduced temperature, ( T -T~) / ( T R -Ti), di-= local velocity, cm. sec.-l = mass flow rate, g. sec.-l mensionless Z + = N G z -l , z k/w C Greek Letters AH*/R = constant in Equation ( l ) , OK. [AH* is interpreted (11) to be the activation energy for flow] n-= 3.1416 p = density, g. ~r n . -~ 7 Y ( H ) = ( A H + / R ) (1/Ti -~/ T R ) , dimensionless Subscripts i = inlet is0 = isothermal niso = nonisothermal o = outlet R = wall = shear stress, dynes cm.+ (momentum flux) LITERATURE CITED 1. Andrade, E. N. da C., Endeauour, 13,117 (1954). 2.

show abstract

Separation of a Gas Mixture Flowing through a Long Tube at Low Pressure

Abstract: This document is reproduced as a project report and is without editorial preparation. The manuscript has

Cited by 78 publications

References 7 publications

Neon isotope separation by gaseous diffusion transport in the transition flow regime with regular geometries

Neon isotope separation by gaseous diffusion transport in the transition flow regime with regular geometries

Diffusion Separation Methods

Mass transport in porous materials under combined gradients of composition and pressure

Contact Info

Product

Resources

About