scholarly journals Determination of Physical Properties, Moisture Absorption Process and Aerodynamic Properties of Grain and Cluster Straw of Two Wheat Cultivars

2020 ◽  
Vol 68 (5) ◽  
pp. 831-840
Author(s):  
Mohammad Jafari ◽  
Gholam Reza Chegini ◽  
Javad Khazaei
Keyword(s):  
Physical Properties ◽  
Drag Coefficient ◽  
Moisture Absorption ◽  
Mass Density ◽  
Terminal Velocity ◽  
Wheat Cultivars ◽  
Projected Area ◽  
Drag Forces ◽  
Aerodynamic Properties

In this study, physical properties of grain and cluster straw including geometric dimensions, moisture absorption and aerodynamic properties of two wheat cultivars were investigated. The effect of cultivar on width, thickness, geometric diameter, spheroid coefficient and mass density was significant at 1% probability level whilst there were no significant effect on grain projected area, length and weight. Moisture absorption of the grains was rapid during the first 30–40 min and then turned to zero. The terminal velocity of wheat grain and straw in three shapes was measured by calculating the projected area in horizontal, lateral and perpendicular directions and then, the drag coefficient was obtained by the equilibrium of the gravity and drag forces at the terminal velocity. Results also showed that increasing moisture content resulted in an increase in the terminal velocity and a decrease in the drag coefficient. Results obtained in this study can be used in designing wheat- cluster straw separation and processing.

Aerodynamic properties of Faba bean (Vicia faba L.) Seeds

2016 ◽  
Vol 39 (3) ◽  
Author(s):  
Mesut Dilmac ◽  
Sefa Tarhan ◽  
Hakan Polatci
Keyword(s):  
Moisture Content ◽  
Physical Properties ◽  
Drag Coefficient ◽  
Vicia Faba ◽  
Faba Bean ◽  
Terminal Velocity ◽  
Moisture Contents ◽  
Aerodynamic Properties ◽  
Agricultural Materials ◽  
Agricultural Material

Aerodynamic properties of agricultural materials are the physical properties considering the reaction of agricultural material piles or seeds against airflow. The airflow resistance of faba bean (<italic>Vicia faba</italic> L.) seed piles was experimentally determined and mathematically modeled for two different moisture contents (11.4 % and 25.8% w.b.) for the superficial air velocities ranging from 0.0225 to 1.395 m<sup>3</sup>·m<sup>−2</sup>·s<sup>−1</sup>. Modified Shedd’s equation and Hukill-Ives equation can be interchangeably used to design aeration systems for the storage and drying bins of faba bean seeds. The terminal velocity values are 11.68 and 12.87 m·s<sup>−1</sup> for the moisture contents of 11.4% and 25.8% (w.b.), respectively. The drag coefficient values are 1.02 and 0.88 for the moisture contents of 11.4% and 25.8% (w.b.), respectively. Moisture content increased terminal velocity but decreased drag coefficient.

scholarly journals Aerodynamic Properties of Makhobeli, Triticale and Wheat Seeds

2014 ◽  
Vol 28 (3) ◽  
pp. 389-394 ◽  
Author(s):  
Feizollah Shahbazi ◽  
Saman Valizadeh ◽  
Ali Dowlatshah
Keyword(s):  
Moisture Content ◽  
Drag Coefficient ◽  
Terminal Velocity ◽  
Mean Value ◽  
Probability Level ◽  
Mean Values ◽  
Aerodynamic Properties ◽  
The Mean ◽  
Content Range ◽  
Wheat Seeds

Abstract The objective of this study was the evaluation of the aerodynamic properties of Makhobeli, triticale and wheat seeds as a function of moisture content from 7 to 27% (w.b). The results showed that the terminal velocity of triticale and wheat seeds increased linearly from 5.37 to 6.42 and from 6.31 to 8.02 m s-1, respectively, as the moisture content increased from 7 to 27%. Over this same moisture content range, the terminal velocity of Makhobeli seeds varied following a polynomial relationship from 4.52 to 5.07 m s-1. Makhobeli seeds had terminal velocities with a mean value of 4.73 m s-1, at different moisture contents, compared to the mean values of 5.89 and 7.13 m s-1 for triticale and wheat seeds, respectively. The mean value of drag coefficient was 1.12 for Makhobeli compared to the values of 0.92 and 0.85 for triticale and wheat, respectively. The analysis of variance showed that there were significant differences between the terminal velocity (at 1 % probability level) and drag coefficient (at 5% probability level) of Mak-hobeli with triticale and wheat seeds, which suggests that aerodynamic separation of Makhobeli from triticale and wheat is possible.

scholarly journals Aerodynamic properties of lentil seeds

2015 ◽  
Vol 29 (3) ◽  
pp. 391-396 ◽  
Author(s):  
Feizollah Shahbazi ◽  
Saman Valizadeh ◽  
Ali Dowlatshah ◽  
Ezatollah Hassanzadeh
Keyword(s):  
Reynolds Number ◽  
Moisture Content ◽  
Drag Coefficient ◽  
Terminal Velocity ◽  
Mean Value ◽  
Probability Level ◽  
Solid Materials ◽  
Aerodynamic Properties ◽  
Red Variety ◽  
Mathematical Relationships

Abstract Aerodynamic properties of solid materials have long been used to convey and separate seeds and grains during post-harvest operations. The objective of this study was evaluation of the aerodynamic properties of green and red lentil seeds as a function of moisture content from 10 to 25% (w.b.). The results showed that as the moisture content increased from 10 to 25%, the terminal velocity of seeds increased, following a linear relationship, from 6.90 to 9.14 and from 6.37 to 7.67 m s−1 for green and red lentil seeds, respectively. Seeds of the green variety had terminal velocities with a mean value of 7.89 m s−1, while the red variety had a mean value of 7.02 m s−1, for moisture content from 10 to 25%. The Reynolds number increased linearly from 2 310.90 to 3 269.23 and from 1 215.02 to 1 535.09 for green and red lentil seeds, respectively, with the increase of seeds moisture content from 10 to 25%. While, drag coefficient decreased from 0.69 to 0.40 and from 0.84 to 0.69 for green and red lentil seeds, respectively, with the increase of moisture content. Mathematical relationships were developed to relate the change in seeds moisture content with the values of aerodynamic properties obtained. The analysis of variance showed that the effect of moisture content on all aerodynamic properties of lentil beans was significant at the 1% probability level.

scholarly journals Evaluation and modeling of aerodynamic properties of mung bean seeds

2015 ◽  
Vol 29 (1) ◽  
pp. 121-126 ◽  
Author(s):  
Feizollah Shahbazi
Keyword(s):  
Reynolds Number ◽  
Moisture Content ◽  
Drag Coefficient ◽  
Mung Bean ◽  
Terminal Velocity ◽  
Mean Value ◽  
Probability Level ◽  
Solid Materials ◽  
Aerodynamic Properties ◽  
Mathematical Relationships

Abstract Aerodynamic properties of solid materials have long been used to convey and separate seeds and grains during post harvest operations. The objective of this study was the evaluation of the aerodynamic properties of mung bean seeds as a function of moisture content and two grades referred to above and below a cut point of 4.8 mm in length. The results showed that as the moisture content increased from 7.8 to 25% (w.b.), the terminal velocity of seeds increased following a polynomial relationship, from 7.28 to 8.79 and 6.02 to 7.12 m s-1, for grades A and B, respectively. Seeds at grade A had terminal velocities with a mean value of 8.05 m s-1, while at grade B had a mean value of 6.46 m s-1. The Reynolds number of both grades increased linearly with the increase of seeds moisture content, while the drag coefficient decreased with the increase of moisture content. Mathematical relationships were developed to relate the change in seeds moisture content with the obtained values of aerodynamic properties. The analysis of variance showed that moisture content had a significant effect, at 1% probability level, on all the aerodynamics properties of mung beans.

scholarly journals Mass modelling of pepper berries (Piper nigrum L.) with some physical properties

Food Research ◽  
2021 ◽  
Vol 5 (S1) ◽  
pp. 80-84
Author(s):  
P.N.M.A. Azman ◽  
R. Shamsudin ◽  
H. Che Man ◽  
M.E. Ya'acob
Keyword(s):  
Physical Properties ◽  
Piper Nigrum ◽  
Probability Level ◽  
Linear Quadratic ◽  
Projected Area ◽  
Packaging System ◽  
Actual Volume ◽  
S Curve ◽  
Economic Standpoint

The determination of correlations between mass with its physical properties such as dimensions, volume and projected area is crucial in the design and development of some post-harvest processing. In this study, the physical properties were measured, and the mass of Kuching pepper berries variety was predicted in four models including Linear, Quadratic, S-curve and Power. Thus, the study was aimed to determine the most applicable model for predicting pepper berry mass with their physical properties and determine some physical properties of pepper berries to form essential and useful information. The results showed that mass modelling based on the actual volume of pepper berries was more applicable compared to other properties with the highest determination coefficient, 0.995 at 1% probability level. From the economic standpoint, predicting mass based on actual volume as Quadratic form: M = 0.828 - 0.015X + 7.376 x 10-5X 2 is recommended. This study can be applied for improvement in handling and packaging system in future.

Experimental Determination of the Terminal Velocity and the Drag Coefficient of Peat Dust Particles

2020 ◽  
Vol 54 (5) ◽  
pp. 299-304
Author(s):  
O. A. Evdokimov ◽  
A. S. Mikhailov ◽  
S. V. Veretennikov ◽  
R. A. Serov
Keyword(s):  
Drag Coefficient ◽  
Experimental Determination ◽  
Terminal Velocity ◽  
Dust Particles

Theory for the Determination of Flutter Speed of a Class of Hydrofoils

1972 ◽  
Vol 94 (1) ◽  
pp. 76-80 ◽  
Author(s):  
J. Mahig
Keyword(s):  
Experimental Study ◽  
Drag Coefficient ◽  
Constant Speed ◽  
Flutter Speed ◽  
Drag Forces ◽  
Lift Curve ◽  
Theoretical Results

A theory is given for the determination of the flutter frequency and speed of a hydrofoil traveling at a constant speed. This work used the work of Sears to determine the fluctuating lift and combined it with the chordwise and transverse drag forces to determine flutter speeds. It is shown that flutter speed is sensitive to the drag coefficient as well as lift curve slopes. The theoretical results obtained are shown compared with an experimental study conducted by Huang.

scholarly journals Physical properties of shelled and kernel walnuts as affected by the moisture content

2010 ◽  
Vol 28 (No. 6) ◽  
pp. 547-556 ◽  
Author(s):  
E. Altuntas ◽  
M. Erkol
Keyword(s):  
Moisture Content ◽  
Physical Properties ◽  
Bulk Density ◽  
Coefficient Of Friction ◽  
Terminal Velocity ◽  
Unit Mass ◽  
True Density ◽  
Projected Area ◽  
Dynamic Coefficients ◽  
Volume Coefficient

The variations in physical properties such as the size dimensions, unit mass, sphericity, projected area, bulk density, true density, volume, coefficient of friction on various surfaces, and terminal velocity of shelled and kernel walnuts as a function of the moisture content were determined. With an increase in the moisture content, the sphericity, projected area, bulk density, volume, and porosity of shelled and kernel walnuts increased, whereas the true density linearly decreased. Studies on rewetted walnuts showed that the terminal velocity increased from 14.17 m/s to 15.50 m/s, and from 12.60 m/s to 14.35 m/s, for shelled and kernel walnuts, respectively. The static and dynamic coefficients of friction of shelled and kernel walnuts on chipboard and plywood surfaces also increased linearly with an increase in the moisture content.

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