The effect of moisture content on physical and mechanical

Kibar, Hakan; Öztürk, Turgut; Esen, Bilge

doi:10.5424/sjar/2010083-1273

Cited by 38 publications

(34 citation statements)

References 25 publications

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“…where μ is the Poisson's ratio, which can be calculated by the equation of Kibar et al [29] as expressed in Table 1, and E is the Young modulus, which is related to the moisture content by the following equation [30] :…”

Section: Stress-strain Analysismentioning

confidence: 99%

Modeling heat and mass transfer–induced stresses in germinated brown rice kernels during fluidized bed drying

et al. 2015

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A study of stress distribution inside a germinated brown rice (GBR) kernel during drying is important to understand the fissure formation of GBR and hence control the drying process in order to improve the quality of GBR. In this study, a finite element method performed in three dimensions in conjunction with the heat and mass balance of the drying system was developed to describe moisture, temperature and stress distributions inside GBR kernels during fluidized bed drying. The modelling was carried out using the couple of heat and mass transfer and validated with the experimental data at 90-150C.The results of moisture and temperature predictions agreed well with the experiments.During drying, tensile stress occurred at the layers close to surface while compressive stress occurred at the inner portion of a kernel. The tensile and compressive stresses increased to the highest value at about 30 s of drying, corresponding to the highest moisture gradient, and then decreased afterwards. The tensile and compressive stresses were higher at a higher drying temperature. These stress prediction results corresponded Downloaded by [New York University] at 01:36 31 July 2015 2 to the experiments which show more severity of GBR fissuring at higher drying temperatures.

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Section: Stress-strain Analysismentioning

confidence: 99%

Modeling heat and mass transfer–induced stresses in germinated brown rice kernels during fluidized bed drying

et al. 2015

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“…To evaluate thousand grain weight (M1,000), randomly selected grains from the bulk were averaged and measured using an electronic balance to an accuracy of 0.01 g (Markowski et al 2013). The grains were then allowed to settle into the container, and the excess was removed before determining the bulk density using the following equation (Kibar et al 2010): The bulk density container was filled to 5 cm above the top.…”

Section: Functional Propertiesmentioning

confidence: 99%

“…The static coefficient of friction was calculated from the constant friction strength through the digital dynamometer after movement (Kibar et al 2010), with three replications performed. During the experiment, the test surface moved at low velocity (2.2 cm/s).…”

Section: Functional Propertiesmentioning

confidence: 99%

Determining the Functional Characteristics of Wheat and Corn Grains Depending on Storage Time and Temperature

Kibar

2015

Journal of Food Processing and Preservation

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The purpose of this study was to determine how storage time (0–90 days) and temperature (10, 12 and 14C) affect the functional properties of wheat and corn grains. Functional properties such as grain moisture content, grain geometry, dry matter, crude protein and fiber, thousand grain weight, bulk density, angles of internal friction and repose, and static coefficient of friction were determined for stored wheat and corn after different storage times and temperatures. The wheat and corn were stored under typical storage conditions and were observed for changes in their functional properties during the 90 days of storage. The results showed that the examined functional properties differed significantly between the storage conditions depending on the storage times and temperatures. For the storage conditions, the optimum temperature was 10C because the minimum losses were observed at this temperature. Practical Applications Little is known about the functional properties of the stored wheat and corn relative to their storage conditions. Recently, there has been an increasing interest by food industry and producers to assure consumers on the presevation of their wheat and corn foods. These research results demonstrated that the internal climatic conditions should be kept under constant control to provide the requirements of the stored grains, whichever storage type is used.

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“…Carman (1996), Gupta and Das (1997), Kibar et al (2010), Visvanathan et al (1996) and Aviara et al (2014a) found the bulk density of lentil (Lens culinaris) seeds, sunflower seeds, Mucuna flagellipes nuts, rice (Oryza sp.) seeds, neem (Azadirachta indica) nuts, and Brachystegia eurycoma seeds, respectively, decreased as the seed moisture content increased.…”

Section: Bulk Densitymentioning

confidence: 99%

Moisture-dependent Physical Properties of Detarium microcarpum Seeds

Aviara¹,

Onaji²,

Lawal³

2015

Journal of Biosystems Engineering

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Purpose: Physical properties of Detarium microcarpum seeds were investigated as a function of moisture content to explore the possibility of developing bulk handling and processing equipment. Methods: Seed size, surface area, and 1,000-seed weight were determined by measuring the three principal axes, measuring area on a graph paper, and counting and weighing seeds. Particle and bulk densities were determined using liquid displacement and weight in a measuring cylinder, respectively. Porosity was computed from particle and bulk densities. Roundness and sphericity were measured using shadowgraphs. Angle of repose and static and kinetic coefficients of friction were determined using the vertical cylindrical pipe method, an inclined plane, and a kinetic coefficient of friction apparatus. Results: In the moisture range of 8.2%-28.5% (db), the major, intermediate, and the minor axes increased from 2.95 to 3.21 cm, 1.85 to 2.61 cm, and 0.40 to 1.21 cm, respectively. Surface area, 1,000-seed weight, particle density, porosity, and angle of repose increased from 354.62 to 433.19 cm 2 , 3.184 to 3.737 kg, 1060 to1316 kg/m 3 , and 30.0% to 53.1%, respectively, whereas bulk density decreased from 647.6 to 617.2 kg/m 3 . Angle of repose increased from 13.9° to 28.4°. Static and kinetic coefficients of friction varied between 0.096 and 0.638 on different structural surfaces. Conclusions: Arithmetic mean, geometric mean, and equivalent sphere effective diameters determined at the same moisture level were significantly different from each other, with the arithmetic mean diameter being greatest. Surface area, 1,000-seed weight, particle density, porosity, and angle of repose all increased linearly with moisture content. Bulk density decreased linearly with moisture content. The coefficients of friction had linear relationships with moisture content. The highest values of static and kinetic coefficients of friction were observed on galvanized steel and hessian fabric, respectively, whereas the lowest values were observed on fiberglass.

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The effect of moisture content on physical and mechanical

Cited by 38 publications

References 25 publications

Modeling heat and mass transfer–induced stresses in germinated brown rice kernels during fluidized bed drying

Modeling heat and mass transfer–induced stresses in germinated brown rice kernels during fluidized bed drying

Determining the Functional Characteristics of Wheat and Corn Grains Depending on Storage Time and Temperature

Moisture-dependent Physical Properties of Detarium microcarpum Seeds

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