Diffusion in Beds of Porous Solids. Measurement by Frequency Response Techniques.

Deisler, Paul F.; Wilhelm, Richard

doi:10.1021/ie50522a026

Cited by 100 publications

(42 citation statements)

References 4 publications

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“…Near the region of the pipe vall, the total diffusion coefficient vas fotind to approach a value corresponding tci the molecular diffusivity~ Measurements on mixing of binary gas mixtures flowing in beds of porous solids. were reported by Deis_l~r and Wilhelm ( 6). A frequency response technique was employed to measure interparticle and intraparticle diffusion effects simultaneously.…”

Section: ··mentioning

confidence: 99%

Gaseous Diffusion at Moderate Flow Rates in Circular Conduits

Roley¹,

Fahien²

1960

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Section: ··mentioning

confidence: 99%

Gaseous Diffusion at Moderate Flow Rates in Circular Conduits

Roley¹,

Fahien²

1960

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“…3 experimental data. Other methods ( 4 , 6,7,14,15,17,20) require considerably more extensive calculations.…”

Section: Theorymentioning

confidence: 99%

Longitudinal mixing in fluidization

Cairns

Prausnitz

1960

AIChE Journal

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Longitudinal mixing properties in liquid-solid fluidized beds were investigated by means of a salt-solution tracer technique. The electrical conductance breakthrough curves were measured with very Small electrical conductivity probes for a step-function input of salt-solution tracer. Longitudinal eddy diffusivities were determined for 1.3and 3.0-mm. lead spheres ond 3.2-mm. glass spheres in 2-and 4-in.4iameter beds at a distance of 5 bed diam. from the injector and for various radial positions.The longihdinol mixing properties are strongly affected by particle concentration; maximum mixing occurs at a fraction voids of 0.7. Longitudinal eddy diffusivity increases with particle density and with decreasing d,/D ratio. Velocitv Drofiles markedlv influence the eddy-diffu-E. J. Cairns is with General Electric Company, Schenectady, New York.

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“…The space-time yield is related to the degree of conversion by (4) for the reaction being considered. Thus the rate can be calculated from data on the space-time yield by the equation…”

Section: Resultsmentioning

confidence: 99%

Reaction rates in the synthesis of ammonia

Mills

Bennett

1959

AIChE Journal

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results as well as an extension into the area of the gas-in-liquid spray tower. ACKNOWLEDGMENTThe financial support of the Monsanto Chemical Company in the form of a fellowship to R. E. C. Weaver during a part of the period covered by this investigation and of the California Research Corporation for a grant-in-aid is gratefully acknowledged. The present work was made possible through this support. NOTATION 1 -B = volumetric holdup V s = slip velocity, ft./sec. = vectorial difference between the average discontinuous fluid velocity and the average continuous velocity. = droplet terminal velocity, ft./ sec . VT Re = Reynolds number CD = drag coefficient

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Diffusion in Beds of Porous Solids. Measurement by Frequency Response Techniques.

Cited by 100 publications

References 4 publications

Gaseous Diffusion at Moderate Flow Rates in Circular Conduits

Gaseous Diffusion at Moderate Flow Rates in Circular Conduits

Longitudinal mixing in fluidization

Reaction rates in the synthesis of ammonia

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