DEM modeling of wood sawdust compaction and breakage strength of pellets determined in diametral compression test

Horabik, J.; Bańda, Maciej; Vozárová, Vlasta; Kubík, Ľubomír; Stasiak, Mateusz

doi:10.31545/intagr/156086

Cited by 8 publications

(13 citation statements)

References 23 publications

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“…Figure 5 shows high oscillations of the pulling force in the potato starch. These observations corroborate results from shear tests performed for potato starch by other authors [6,[26][27][28][29]. The oscillations of forces measured in some powders are associated with the slip-stick effect.…”

Section: Resultssupporting

confidence: 91%

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Determination of the Strength of Consolidated Powder Materials with a Pull-Based Tester

et al. 2023

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In recent years, there has been increasing interest in the agglomeration of bulk materials. New methods are being sought to improve the measurement of bulkiness in food powders. This study aimed to design a new measuring device to assess the phenomenon of caking as well as the degree of strength of free-flowing powders. Wheat flour and potato starch have been used in the experiment and loaded into a perforated container. A steel or polypropylene measuring rod has been placed in the middle, and 5 kPa and 10 kPa were loaded, respectively. The new method is based on measuring the force through a sensor when pulling out measuring rods from the powder sample. It was shown that higher strength values have been obtained for powders loaded with 10 kPa and that groove depth has not been significant for wheat flour. Additionally, a significant difference in the evolution of the pulling force with time has been observed for wheat flour and starch, revealing a slip-stick phenomenon in the latter one. The pull-based tester is characterized by fast measurement and easy analysis of the results. The tests performed for potato starch and wheat flour have provided significantly different temporal evolutions of the pulling force.

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Section: Resultssupporting

confidence: 91%

“…Hence, the material has a greater ability to withstand higher shear loads. When the maximum strength is exceeded, dilatation in the shear zone occurs, and strength decreases [26].…”

Section: Resultsmentioning

confidence: 99%

Determination of the Strength of Consolidated Powder Materials with a Pull-Based Tester

et al. 2023

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“…The corn groats were used in this study in an unconsolidated state of 0 kPa (bulk density) and under consolidation pressures of 40 and 80 kPa, respectively, corresponding to pressures prevailing in industrial silos (0 kPa-upper free layer of bulk material; 40 kPa-approximately 3 m below the upper free layer of bulk material; and 80 kPaapproximately 6 m below the upper free layer of bulk material; approximate calculations for medium-slender and low silos) [21,22].…”

Section: Methodsmentioning

confidence: 99%

Application of MOX Sensors to Determine the Emission of Volatile Compounds in Corn Groats as a Function of Vertical Pressure in the Silo and Moisture Content of the Bed

Rusinek,

Żytek,

Stasiak

et al. 2024

Sensors

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This study was focused on the analysis of the emission of volatile compounds as an indicator of changes in the quality degradation of corn groats with 14% and 17% moisture content (wet basis) using an electronic nose (Agrinose) at changing vertical pressure values. The corn groats were used in this study in an unconsolidated state of 0 kPa (the upper free layer of bulk material in the silo) and under a consolidation pressure of 40 kPa (approximately 3 m from the upper layer towards the bottom of the silo) and 80 kPa (approximately 6 m from the upper layer towards the bottom of the silo). The consolidation pressures corresponded to the vertical pressures acting on the layers of the bulk material bed in medium-slender and low silos. Chromatographic determinations of volatile organic compounds were performed as reference tests. The investigations confirmed the correlation of the electronic nose response with the quality degradation of the groats as a function of storage time. An important conclusion supported by the research results is that, based on the determined levels of intensity of volatile compound emission, the electronic nose is able to distinguish the individual layers of the bulk material bed undergoing different degrees of quality degradation.

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“…They occur as a consequence of compaction and dilatation around the shear region in the material [22]. Many bulk solids of plant origin exhibit this peculiar behavior, including wheat flour, maize starch, potato starch, and milk powder [23][24][25]. It was found that the slip-stick response is affected by, among other factors, shear velocity, coefficient of interparticle friction, stiffness of the material, and its compressibility [20,[26][27][28].…”

Section: Evolution Of the Pulling Force Over Timementioning

confidence: 99%

Time of Consolidation and Humidity Influence on Properties of Food Powders

Stasiak,

Wajs,

Bańda

et al. 2024

Processes

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The effect of short-term storage at 75% and 90% ambient humidity on the mechanical properties of selected materials was determined using a new device for measuring the strength of food powders. A series of tests were conducted on wheat flour and potato starch subjected to various consolidation loads. The high accuracy and repeatability of the measurements confirmed the suitability of the pull-based tester for assessing the degree of caking in food powders. The pull-based tester allows for the measurement of strength parameters of agglomerates under various consolidation loads while simultaneously wetting the powder, introducing a novel approach to assessing the mechanical properties of powders. The analysis of force oscillation during the withdrawal of the measuring rod from the powder facilitates the identification of the slip-stick effect in these materials and the determination of parameters characterizing that phenomenon. The outcomes of this study may be of interest to farmers, manufacturers, and companies processing raw materials.

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DEM modeling of wood sawdust compaction and breakage strength of pellets determined in diametral compression test

Cited by 8 publications

References 23 publications

Determination of the Strength of Consolidated Powder Materials with a Pull-Based Tester

Determination of the Strength of Consolidated Powder Materials with a Pull-Based Tester

Application of MOX Sensors to Determine the Emission of Volatile Compounds in Corn Groats as a Function of Vertical Pressure in the Silo and Moisture Content of the Bed

Time of Consolidation and Humidity Influence on Properties of Food Powders

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