Aerodynamic properties of sesame (cv.N-8) as affected by moisture content of seed

Abstract

The aerodynamic properties of crop grains influence the selection of the design and operational parameters of equipment. These properties are crop variety specific and moisture dependent. Measurement of terminal velocity is important to determine other aerodynamic properties. A terminal velocity measuring apparatus with vertical tapering rectangular air duct was developed which can measure velocity from 0 to 15 m/s. The sesame (Sesamum indicum Linn.) seeds of variety N-8 were dipped in water to obtain test samples of moisture contents 9.50, 13.46, 18.89, 24.17 and 28.99 per cent. The terminal velocity measured with the newly developed apparatus was found increased from 3.05 to 5.25 m/s with corresponding increase in moisture contents from 9.50 to 28.99 per cent (w.b.), respectively. In other aerodynamic properties, the values of drag co-efficient were found decreased from 2.9 to 0.6 and Reynolds number increased from 3939.9 to 11043.6 with corresponding increase in moisture contents from 9.50 to 28.99 per cent (w.b.), respectively. Simple linear regression equations were fitted to the obtained data to predict the aerodynamic properties of sesame seeds.

Determination of Mechanical and Aero-Dynamics Properties of some Legume Crops

“…Also, for lentil seeds, as the moisture content increased from 12.18 to 22.33 % the values of terminal velocity were increased from 6.174 to 6.919 m/sec. These results matching with those published in literatures for some seeds like Carman, (1996) for lentil seeds, Shahbazi, (2015) for mung bean seeds, Marathe, et. al., (2017) for sesame seeds.…”

“…Similar results were also reported by several researchers for other seeds like Shahbazi, (2015) for mung bean seeds, Marathe, et. al., (2017) for sesame seeds.…”

Determination and modeling of physical and aerodynamic properties of coffee beans ( Coffea arabica ) during the drying process

“…Along with physical properties, any post-harvest operation that uses airflow requires knowledge about the aerodynamic properties of agricultural products (Kara et al, 2012;Shahbazi, 2015). Information about aerodynamic properties, such as terminal velocity and drag coefficient, is widely used in the transportation and separation of undesirable products, such as impurities and inferior materials, mainly in the operations of harvesting, selection, cleaning, drying, storage, processing, and classification of agricultural products (Marathe et al, 2017;Shahbazi et al, 2014).…”

Variation of the physical and aerodynamic properties of coffee cherries during drying: Determination and modeling

“…Linear regression models are commonly used to represent terminal velocity as a function of moisture content (Khodabakhshian et al, 2012). However, nonlinear models have demonstrated better adjustments for several agricultural products, such as turgenia seeds and wheat grains (Nalbandi, Seiiedlou, & Ghassemzadeh, 2010), cephalaria seeds (Shahbazi et al, 2014), mung beans (Shahbazi, 2015), fava bean seeds (Dilmac, Tarhan, & Polatci, 2016), and sesame seeds (Marathe et al, 2017).…”

“…The aerodynamic forces that exist during the relative movement between air and materials act differently on different particles (Kara, Bastaban, Ozturk, Kalkan, & Yildiz, 2012;Shahbazi, 2015). In this sense, the aerodynamic properties have a large scope of applicability in the process of separating undesirable products, such as impurities and inferior materials, mainly in the operations of harvesting, selection, cleaning, drying, processing, and classification (Marathe, Jaybhaye, & More, 2017). In addition, information about these properties allows the separation of products with different moisture content and specific mass and can be used for the correct use of pneumatic conveyors.…”