Interparticle surface affinity and the bulk properties of conditioned powders

Hollenbach, A.M.; Peleg, Micha; Rufner, Robyn

doi:10.1016/0032-5910(83)85026-8

Cited by 51 publications

(31 citation statements)

References 7 publications

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“…With an increase in moisture, compressibility increases, causing flowability problems (Moreyra and Peleg 1981;Yan and Barbosa 1997). Moisture can also be coupled with surface properties, and it can change or influence adherence properties between particles and storage tanks (Hollenbach et al 1983). Moisture migration and liquid bridge formation could lead to such flowability problems in DDGS.…”

Section: Flowability Properties Of Commercial Distillers Dried Grainsmentioning

confidence: 99%

Flowability Properties of Commercial Distillers Dried Grains with Solubles (DDGS)

2009

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Cereal Chem. 86(2):170-180Distillers dried grains with solubles (DDGS), the major coproduct from the corn-based fuel ethanol industry, is primarily used as livestock feed. Due to high protein, fiber, and energy contents, there is a high demand for DDGS. Flowability of DDGS is often hindered due the phenomenon of caking. Shipping and handling of DDGS has thus become a major issue due to bridge formation between the DDGS particles. The objective of this investigation was to measure flowability characteristics of DDGS samples from five ethanol plants in the north central region of the United States. Carr and Jenike tests were performed and the resulting data were mathematically compared with a previously developed empirical model. The largest particles had an average geometric mean diameter (GMD) of 1.19 mm, while the lowest particle size had an average GMD of 0.5 mm. Soluble solid levels were ≈10.5-14.8% (db). The effective angle of friction (δ) was 43.00-57.00°. Additionally, a few parameters exhibited fairly high linear correlations, including aerated and packed bulk densities (r = 0.97), geometric standard deviation and Carr compressibility (r = 0.71), geometric standard deviation and Hausner ratio (r = -0.70). Overall flowability assessment indicated that the commercial DDGS samples did have the potential for flow problems, although no samples exhibited complete bridging. Quantifying DDGS flowability is a necessary step toward overcoming this logistical challenge facing the fuel ethanol industry.

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Section: Flowability Properties Of Commercial Distillers Dried Grainsmentioning

confidence: 99%

Flowability Properties of Commercial Distillers Dried Grains with Solubles (DDGS)

2009

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“…Hollenbach et al (1983) found that calcium stearate and silicon oxide had no effect on improving the flowability of soy protein powder. This was due to the poor affinity between the conditioner and the host powder.…”

Section: Flow Conditioners and Anticaking Agentsmentioning

confidence: 94%

“…It has also been found that with an increase in moisture, bulk density of granular solids decreases and the compressibility increases (Moreyra and Peleg, 1981;Yan and Barbosa, 1997). Moisture at higher levels can possibly alter the surface properties of particles to such an extent that the adherence pattern may also be modified (Hollenbach et al, 1983).…”

Section: Moisture Contentmentioning

confidence: 99%

“…The conditioner's particles must stick to the host powder particles; thereby producing a smoother and less frictional surface by filling the void spaces (Peleg and Hollenbach, 1984). Flow properties of conditioned powders are strongly influenced by the kind of surface interaction between the host powder and the conditioner particles (Hollenbach et al, 1983). For example, dolomitic limestone had an arching dimension of 3.2 ft in a mass flow bin, whereas with a fractional addition of flow additive showed a zero arching dimension.…”

Section: Flow Conditioners and Anticaking Agentsmentioning

confidence: 99%

“…If the surface affinity between the host powder and conditioner is strong, then large effects will be present in the bulk density and compressibility at inclusion concentrations of 0.1 to 0.5%. When there is a little affinity, the effects become noticeable only at 1 to 2% concentration (Hollenbach et al, 1983). Danish and Parrott (1971) investigated the effect of size and concentration of lubricants (hydrogenated castor oil, glycerol monostearate, polyethylene glycol 4000, and stearic acid) on the flow rate of sodium chloride and lactose granulations.…”

Section: Flow Conditioners and Anticaking Agentsmentioning

confidence: 99%

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