Friction coefficient of maize, cowpea and groundnuts on different structural surfaces

Bart-Plange, Ato; Addo, A.; Aveyire, Joseph; Tutu, E.

doi:10.4314/just.v27i1.33033

Cited by 3 publications

(8 citation statements)

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“…2. Bart-Plange et al [8] reported similar observation for plywood, galvanized steel and rubber surfaces with cowpea, maize and groundnut. The coefficient of variation (CV) values according to Nwakuba et al [21] should be < 4% but were observed to be 2.75%.…”

mentioning

confidence: 64%

“…(1). These moisture content levels were adequate since handling and storage of the studied grain samples are mostly carried in within this moisture content range [8].…”

Section: Methodsmentioning

confidence: 94%

“…Fig. 2a -d Previous studies have shown that linear increase in μ -values with moisture content may be attributed to increase in inter-particulate properties and adhesive forces between the grain samples and the contact surfaces as the sample moisture content increases, as well as inability of wet and heavy grain samples to easily slide over the testing surfaces [7,8].…”

Section: Methodsmentioning

confidence: 99%

“…Influence of different structural surfaces and moisture levels on coefficients of friction have been reported for various food grains. A linear correlation between moisture content and coefficient of friction on different surfaces has been observed [7,8,9,10,11]. Previous studies indicated that increase in friction coefficient with increasing moisture content may be as a result of increase in forces of cohesion and adhesion acting on the surface of contact, the nature of structural material, and inter-particulate properties [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies indicated that increase in friction coefficient with increasing moisture content may be as a result of increase in forces of cohesion and adhesion acting on the surface of contact, the nature of structural material, and inter-particulate properties [11,12]. Reports on the determination of static coefficient of friction in grains and nuts on several structural surfaces like glass, jute bag, mild steel, stainless steel, galvanized steel, aluminum, polythene, etc., using either the method of tilting table test or method of inclined plane have been made by several researchers [7,8,13,14]. It is noted that these several structural materials, which are commonly used for construction of grain handling, processing and storage equipment should be selected based on their low frictional coefficients in contact with grain products.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Friction Coefficients of Local Food Grains on Different Structural Surfaces

Nwakuba

Chukwuezie

Uzoigwe

et al. 2019

JERR

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Knowledge of friction coefficient of agricultural commodities on various structural surfaces is imperative in the design and material selection for postharvest handling, transportation, processing and storage equipment. This paper presents the friction coefficients of local food grains on different structural surfaces as a function of moisture content. The experiment was conducted using a Complete Randomized Design (CRD) in a factorial treatment design to evaluate the influence of different structural surfaces (glass, mild steel, plastic, ply-board, and aluminium) and moisture content levels (6, 12, 18, and 24% wet basis) on the coefficient of friction of selected local grains (benniseed, finger millet, pearl millet, and hungry rice). Results obtained indicate that the friction coefficient (μ) of the studied grain samples increased linearly with increase in moisture level for all the tested structural surfaces. Within the range of the studied moisture content, benniseed exhibited the highest μ-value (0.526 ± 0.031 ≤ μ ≤ 0.784 ± 0.157) on ply-board, whereas hungry rice had the lowest value (0.248 ± 0.018 ≤ μ ≤ 0.527 ± 0.023) on glass material. Amongst the tested metal surfaces, aluminum had the lowest μ-value (0.236) at 6% moisture content. The effect of structural surfaces and moisture contents as well as their interactions on friction coefficient were statistically significant at P =.05 for all the studied grain samples. High values of correlation coefficient (R2) > 0.95 were obtained to indicate strong correlation between μ-values and experimental factors. A low coefficient of variation (CV) of 2.75% was obtained to show high experimental reliability.

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mentioning

confidence: 64%

“…(1). These moisture content levels were adequate since handling and storage of the studied grain samples are mostly carried in within this moisture content range [8].…”

Section: Methodsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Friction Coefficients of Local Food Grains on Different Structural Surfaces

Nwakuba

Chukwuezie

Uzoigwe

et al. 2019

JERR

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Development and performance evaluation of a Pedal Operated Seed Cleaner (POS-Cleaner)

Akatuhurira

Tumutegyereize

Oluk³

et al. 2021

SN Appl. Sci.

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Traditional grain cleaning methods are labor-intensive, time-consuming, and yet very inefficient. The use of available mechanical seed cleaners is widely limited since they are expensive to own, operate, and maintain. A Pedal Operated Seed Cleaner (PoS-Cleaner) was developed and its performance evaluated. Appropriate engineering principles and methodologies were used in the sizing and construction of the machine. The cleaner consists of a bicycle-like pedaling system, hopper, a centrifugal fan, and three cleaning sieves which include two inside interlocking sieves (one sieve fixed and the other adjustable); whose meshes can be adjusted to be larger than the size of the unclean seeds by longitudinally translating the second sieve to achieve the appropriate seed size. This allows trapping of impurities larger than the seeds. Cleaning rates of 576.5 kg/h, 375.8 kg/h, and 377.4 kg/h for maize, beans, and groundnuts were obtained respectively. Maize, beans, and groundnuts had their highest cleaning efficiencies of 95.09%, 87.61%, and 81.67% at inner sieve sizes of 13 mm, 16 mm and 10 mm respectively, pedaling speed of 60 rpm. The PoS-Cleaner presents a more viable cleaning option for smallholder farmers in rural and remote areas with no access to the national grid, therefore producing high-quality seeds. This will eventually facilitate agricultural value addition and increase individual family incomes in Uganda. Article highlights A pedal operated multi-seed cleaner was developed. Achieved 5 times higher seed cleaning rates compared to traditional cleaning technologies. Attained higher separation efficiencies of seed and externalities compared to traditional technologies.

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Determination of Selected Moisture -Dependent Physical and Frictional Properties of Shelled Egusi Melon (Citrullus lanatus Thunb.)

Satimehin¹,

Akaayar²

2017

FUOYEJET

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Physical and frictional properties were determined for shelled (i.e. hulled) seeds of egusi melon (Citrullus lanatus Thunb) at moisture content levels of 11.04, 15.7, 21.03 and 24.78 % dry basis. The physical properties investigated were true density, bulk density and the angle of repose; while the frictional properties were the coefficient of static friction and the coefficient of internal friction. Densities were determined using the volume displacement method, while the bulk porosity was calculated as a function of the true and bulk densities. The angle of repose was measured using the cylinder method. The coefficient of static friction of melon seeds on the surfaces of plywood, galvanized iron and glass was determined by sliding a cell filled with the seeds on a tilting table overlaid with the test material surfaces. The coefficient and internal angle of friction were determined by means of a shear test apparatus. Within the range of moisture investigated, the true density of shelled melon seeds decreased from 1,264 to 1,239 kg/m3 while its bulk density increased from 668 to 681 kg/m3. The porosity decreased from 47.19 to 45.36 % while the angle of repose increased from 31.0 to 34.9°. The coefficient of friction of shelled melon seeds on the surfaces of glass, galvanised iron and plywood increased from 0.329 to 0.475, 0.364 to 0.476 and 0.408 to 0.559 respectively. The coefficient and angle of internal friction increased from 0.638 to 0.668 and 32.52 to 33.74°, respectively. These findings are valuable data for efficient design of machines for processing, handling and storage of hulled seeds of egusi melon.

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Friction coefficient of maize, cowpea and groundnuts on different structural surfaces

Cited by 3 publications

References 0 publications

Friction Coefficients of Local Food Grains on Different Structural Surfaces

Friction Coefficients of Local Food Grains on Different Structural Surfaces

Development and performance evaluation of a Pedal Operated Seed Cleaner (POS-Cleaner)

Determination of Selected Moisture -Dependent Physical and Frictional Properties of Shelled Egusi Melon (Citrullus lanatus Thunb.)

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