Structural properties of packed beds — A review

Haughey, D. P.; Beveridge, G.S.G.

doi:10.1002/cjce.5450470206

Cited by 222 publications

(88 citation statements)

References 153 publications

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“…This mean value is in good agreement with that obtained by Kato et al (6) In general, random packings are separated into three categories (10) . "Very loose random packing" is obtained when momentum is minimized and opportunities for bridging are maximized.…”

Section: Case Of No Wall/floor Effectsupporting

confidence: 91%

Effects of Cubic Container's Wall or Floor on Random Packing Structures of Spherical Particles

Taguchi

Kurashige²,

Imai³

2006

JSME Int. J., Ser. A

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By computer simulation, we examined how a wall or a floor of a container affects the random packing structure of a cubic aggregate of spherical particles. We constructed a model of the aggregate by sequential accumulation of spheres in a cubic box using (A) cyclic boundary conditions only in the y-direction together with random ups and downs of the box floor to estimate the wall effect and (B) the conditions in both of the horizontal directions to extract the floor effect. Using the obtained packing data, we estimated the "area porosities" and cumulative frequencies of the diameters of circles appearing on some cross sections created by cutting the aggregate at different levels, both as functions of distance from the wall/floor. From these results, we found that the surface effect seems to extend as deep as 2.5 particle diameters from the wall and approximately 4.5 diameters from the floor.

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Section: Case Of No Wall/floor Effectsupporting

confidence: 91%

Effects of Cubic Container's Wall or Floor on Random Packing Structures of Spherical Particles

Taguchi

Kurashige²,

Imai³

2006

JSME Int. J., Ser. A

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“…It is shown that the present packings fall in the category of random loose packing [16,17]. In addition, since this value is very close to the value (41%) obtained for the most slightly sintered glass-bead aggregates by experiments [18], the present packing method is justified even though various simplifying assumptions have been made, including negligence of the acceleration term in the motion equation.…”

Section: Porositysupporting

confidence: 77%

Microstructures and macroscopic conductivity of randomly packed and uniaxially pressed sphere compacts

Taguchi¹,

Kurashige²

2007

International Journal of Heat and Mass Transfer

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The present paper deals with simulation of microstructures and macroscopic conductivity of randomly packed, uniaxially pressed and sintered particles. Random packings of identical spheres are constructed by using a sequential deposition method and their microgeometry after the compaction in sintering is geometrically created by proportional reduction in distances between the sphere centers only in the vertical direction and by mass addition around overlapped necks. Some of microgeometrical characteristics of the created compacts are statistically examined. Using the data on the packings and geometrical models, macroscopic thermal conductivities of the compacts are estimated. It is found that the conductivities are greatly different from those of simple cubic packings, although both the packings have almost the same coordination number, and that anisotropy in the conductivity is induced by the compaction in addition to gravity. The conductivities are expressed as a function of the compaction and sintering degrees for practical purposes. Keywords

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“…Beveridge [20] and are presented in Table 3.3. Table 3.3 Four modes of particle packing as listed by Haughey and Beveridge [20].…”

Section: Effect Of the Microporous Coating Thickness On Wickabilitymentioning

confidence: 99%

Evaporative Cooling Performance of a Brazed Microporous Coating on an Aluminum Surface

King

Amaya

You

2012

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D

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The effect of an aluminum microporous coating on evaporative cooling performance of water was studied. The coating consisted of aluminum powder brazed to a flat aluminum substrate. Coatings of average thicknesses of 175 μm, 270 μm, 900 μm, and of average aluminum particle sizes of 27 μm, 70 μm and 114 μm were tested. A hot water treatment of the coating insured repeatability of thermal performance. Wickability was measured and compared to Washburn’s equation for capillary flow. Evaporative cooling tests were then performed on coated and plain surfaces. The test surfaces were uniformly heated while kept vertically dipped in an isothermal pool of water. All microporous coatings increased evaporative heat transfer relative to that of the plain surface by their ability to wick fluid to the entire heated area. With particle size increase from 27 μm to 70 μm both the wickability and heat transfer were significantly increased, but no further significant gains in either were obtained with increase to 114 μm. The maximum heat transfer coefficient was increased ∼11 times and the temperature limit (dry-out) heat flux increased ∼10 times with the two larger particle sizes (70 μm and 114 μm). The heat transfer coefficient and dry-out heat flux similarly increased with thickness increase.

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Structural properties of packed beds — A review

Cited by 222 publications

References 153 publications

Effects of Cubic Container's Wall or Floor on Random Packing Structures of Spherical Particles

Effects of Cubic Container's Wall or Floor on Random Packing Structures of Spherical Particles

Microstructures and macroscopic conductivity of randomly packed and uniaxially pressed sphere compacts

Evaporative Cooling Performance of a Brazed Microporous Coating on an Aluminum Surface

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