Flow of granular materials: Determination and interpretation of flow patterns

Novosád, Jan; Surapati, K.

doi:10.1016/0032-5910(68)80042-7

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…The effect of spatially nonuniform gas flows on the performance of moving packed-bed reactors has been studied very recently by Yagi and Szekely (1977u, b) and also by Kuwabara and Muchi (1976) who have shown that the overall conversion may indeed be affected quite markedly by the gas flow maldistribution. While these authors assumed a flat velocity profile for the solid stream, there are strong indications in the literature, notably due to the work of Chatlynne and Resniclc (1973), Novosad and Surapati (1968), and Takahashi and Yanai (1973), that, in general, solids flow also tends to be maldistributed. In particular, for moving beds, the central portion of the solids would tend to move faster than the region close to the wall.…”

Section: Scopementioning

confidence: 99%

“…The flow pattern of solids in moving beds has been studied by a number of investigators, notably by Chatlynne and Resnick ( 1973), Novosad and Surapati (1968), and Takahashi and Yanai ( 1973). These authors have generally found that the postulate of a flat velocity profile would not be valid because in a moving bed the solids would tend to move faster in the central part of the column, while the region in the vicinity of the walls would tend to be retarded.…”

Section: B )mentioning

confidence: 99%

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The effect of gas and solids maldistribution on the performance of moving‐bed reactors: The reduction of iron oxide pellets with hydrogen

Yagi

Szekely

1979

AIChE Journal

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A mathematical formulation is presented describing the reduction of iron oxide pellets with hydrogen in a counterflow moving‐bed arrangement under conditions such that both the gaseous and the solids streams may be maldistributed. This maldistribution is imposed on the system by prescribing a radial variation in the void fraction and the particle size, together with a radial variation in the axial velocity of the solid stream. In the formulation, allowance has been made for realistic chemical kinetics and nonisothermal behavior. Computer results are presented for both the maldistributed system and for base line cases where uniform gas and solids flow have been postulated. It was found that maldistribution may play a very marked role in affecting the performance of the system, in particular, when the gas and the solid streams are mismatched, for example, preferential flow of gas near the walls and preferential flow of solids in the central core.

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Section: Scopementioning

confidence: 99%

Section: B )mentioning

confidence: 99%

The effect of gas and solids maldistribution on the performance of moving‐bed reactors: The reduction of iron oxide pellets with hydrogen

Yagi

Szekely

1979

AIChE Journal

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“…Concern has been raised on the operational adequacy during silo discharge in the following procedures. In general, silos with steep hoppers and smooth walls lead to mass flows, securing a reliable flow where all the solids are moving once discharge starts, whereas silos with less inclined hoppers or rough walls develop funnel flows, causing interrupted, unreliable, and even impeded discharges (Campbell, 2006;Drescher, 1992Drescher, , 1998Jenike, 1964Jenike, , 1987Michalowski, 1987;Novosad & Surapati, 1968;Perry, Rothwell, & Woodfin, 1976;Rao & Venkateswarlu, 1973;Rotter, 1998, chap. 36;Rotter, 2001).…”

Section: Introductionmentioning

confidence: 99%