Comparison of three rotational shear cell testers: Powder flowability and bulk density

2015 ◽  
Vol 283 ◽  
pp. 103-112 ◽  
Author(s):  
Sara Koynov ◽  
Benjamin Glasser ◽  
Fernando Muzzio
Foods ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2622
Author(s):  
Laura E. C. Noordraven ◽  
Hyun-Jung Kim ◽  
Hans Hoogland ◽  
Tara Grauwet ◽  
Ann M. Van Loey

Chickpea flours are an interesting multifunctional ingredient for different food products. This study investigated the potential of differently processed chickpea flours as alternative thickening agents in an instant soup recipe, replacing potato starch. Dry instant soup powders were compared on bulk density and powder flowability, whereas prepared liquid instant soups were studied in terms of rheological behaviour (as influenced by microstructure) and volatile composition. The chickpea-flour-containing soup powders possessed similar powder flowability to a reference powder but were easier to mix and will potentially result in reduced blockages during filling. For prepared liquid instant soups, similar viscosities were reached compared to the potato starch reference soup. Nevertheless, the chickpea-flour-containing soups showed higher shear thinning behaviour due to the presence of larger particles and the shear induced breakdown of particle clusters. Flavour compounds from the soup mix interacted with chickpea flour constituents, changing their headspace concentrations. Additionally, chickpea flours introduced new volatile compounds to the soups, such as ketones, aldehydes, alcohols, and sulphur compounds, which can possibly alter the aroma and flavour. It was concluded that chickpea flours showed excellent potential as alternative thickening ingredient in instant soups, improving the protein, mineral and vitamin content, and the powder flowability of the soups, although the flavour of the soups might be affected by the changes in volatile profiles between the soups.


Author(s):  
Ertan Ermiş ◽  
Rabia Güneş ◽  
İnci Zent

Determination of powder flow behaviour is very important due to the importance of their technological applications. Use of powder flowability data in the design of hoppers is one example. Investigation of the parameters such as particle size, particle size distribution, particle shape, chemical composition, water content and temperature which affect flowability is necessary. Within this work a powder flow tester (PFT) from Brookfield Engineering Laboratories Inc. was employed to assess the flow behaviour of table sugar and rock salt powders having varied size fractions. Flow function, bulk density as well as compressibility of powder samples were tested. The rock salt and table sugar powders were grinded, screened and fractioned into 5 fractions of rock salt and 7 fractions of table sugar powder. The results indicated that increasing particle size led to increasing flowability and bulk density while decreasing compressibility. The threshold particle size range which changes these parameters significantly was notes as 100-200 µm.


2018 ◽  
Vol 4 (1) ◽  
pp. 0117-0126
Author(s):  
Denise Baiao ◽  
Camila dos Santos Machado ◽  
Rodrigo Condotta

Este trabalho teve como o objetivo avaliar o efeito da granulometria (tamanho das partículas e faixa de distribuição granulométrica) nas principais propriedades físicas de leitos bi dispersos, tais como densidade aparente, porosidade, coesão, compressibilidade e energia básica de fluxo. Para tanto foram confeccionados dois grupos de misturas envolvendo areias comerciais com diferentes granulometrias. O primeiro grupo (G1) consistiu na incorporação de dois tipos de areias de quartzo (partículas menores que mesh 200 e mesh 600) em um de tipo de areia de sílica comercial 50/60 (grosso). O segundo grupo (G2) constituiu em misturas de areias de sílica 40/50 (grosso) mediante adição de partículas de menor granulometria de areia de sílica 50/60 e 80/100. Todas as misturas foram analisadas em condições estáticas, dinâmicas e na iminência do movimento (cisalhamento). Como resultado observou-se uma maior tendência por parte das partículas de tamanho reduzido em formar aglomerados, aumentando a porosidade e diminuindo densidade aparente quando não consolidadas. A presença de partículas de tamanho reduzido nas misturas do grupo 1 também melhorou a fluidização das misturas deste grupo, mas prejudicou a fluidez aumentando a coesão do meio. Os resultados obtidos para o grupo 2 de misturas não apresentaram diferenças significativas em suas características com a incorporações de finos. Isto se deve a baixa relação entre o tamanho das partículas, de maneira que as partículas menores não cabem nos interstícios das partículas maiores.The present work aims to evaluate the effect of granulometry (particle size and particle size distribution) on the manly physical properties of bidisperse bulk solids, such as bulk density, porosity, cohesion, compressibility and basic flow energy. Therefore, two groups of mixtures comprising commercial sands with different sizes were prepared. The first group (G1) consisted on adding two sort of fine quartz powder (particle undersize of 200 and 600 mesh) into commercial sand 50/60 (coarse). The second group (G2) was formulated adding commercial sand (80/100 and 50/60) added into coarse one (40/50). All mixtures were tested at static and dynamic conditions and at incipient transition (shear test). As result, it was observed higher interactions for smaller quartz’s particles that lead to form agglomerates, increasing bulk porosity and reducing bulk density of non-consolidated mixtures comprising this sort of material. Fine particles at group 1 mixtures have also improved the quality of fluidization, but decrease powder flowability increasing cohesion. The results obtained for group 2 mixtures have revealed no significant changes on bulk properties as increasing fine particle into coarse one. This is could be attributed to the low ratio between fine and coarse particles, changing particle packing, once the interspaces between coarse particles could not be filled with fine one.


1993 ◽  
Vol 4 (1) ◽  
pp. 33-40 ◽  
Author(s):  
N. Stanley-Wood ◽  
M. Sarrafi ◽  
Z. Mavere ◽  
M. Schaefer

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