One of the aerodynamic characteristics of lentil is its terminal velocity. In order to determinate the terminal velocity, was designed a vertical wind tunnel. It was fabricated based on existing methods and standards. For decreasing the non-uniformity of airflow in the vertical wind column, was used a honey comb test area with 5 mesh screens. So, a wind tunnel nozzle was designed and fabricated using Morel method with the aim of increasing airflow rate and decreasing losses due to mesh screens. The height and section area of tunnel were 1.425 m and 0.1 × 0.1 m2, respectively. The pressure loss values were calculated at different parts of tunnel and then, the required power of tunnel was determined. In this study, lentil grains of Kimia and Gachsaran varieties were separated at three groups based on their size (small, medium and large). Then, the terminal velocity was measured at 5 levels of moisture content (8, 12, 16, 20 and 24% (w.b.)) for each group. The results showed that Kimia and Gachsaran variety had the highest (7.204 m·s–1) and the lowest (6.987 m·s–1) terminal velocity, respectively. The mean value of terminal velocity increased linearly from 6.751 to 7.396 m·s–1 by increasing the moisture content from 8 to 24% (w.b.). Also, by increasing the grains dimension from small to large, the terminal velocity increased from 6.345 to 7.792 m·s–1.
Bhattacharya Sila, Narasimha Hampapura V., Bhattacharya Suvendu (2005): The moisture dependent physical and mechanical properties of whole lentil pulse and split cotyledon. International Journal of Food Science and Technology, 40, 213-221 https://doi.org/10.1111/j.1365-2621.2004.00933.x
Çarman K. (1996): Some Physical Properties of Lentil Seeds. Journal of Agricultural Engineering Research, 63, 87-92 https://doi.org/10.1006/jaer.1996.0010
Gharibzahedi S.M.T., Ghasemlou M., Razavi S.H., Jafarii S.M., Faraji K. (2011): Moisture-dependent physical properties and biochemical composition of red lentil seeds. International Agrophysics, 25: 343–347.
Guner M. (2006): Pneumatic conveying characteristics of some agricultural seeds. Journal of Food Engineering, 5: 112–123.
Gupta R.K., Das S.K. (1997): Physical Properties of Sunflower Seeds. Journal of Agricultural Engineering Research, 66, 1-8 https://doi.org/10.1006/jaer.1996.0111
Gupta R.K., Arora Gopika, Sharma Rajiv (2007): Aerodynamic properties of sunflower seed (Helianthus annuus L.). Journal of Food Engineering, 79, 899-904 https://doi.org/10.1016/j.jfoodeng.2006.03.010
Gursoy S., Guzel E. (2010): Determination of physical properties of some agricultural grains. Research Journal of Applied Science, Engineering and Technology, 2: 495–498.
ISik ESref (2007): Moisture Dependent Physical and Mechanical Properties of Green Laird Lentil (Lens culinaris) grains. Pakistan Journal of Biological Sciences, 10, 474-480 https://doi.org/10.3923/pjbs.2007.474.480
Kabas Onder, Yilmaz Erdem, Ozmerzi Aziz, Akinci İbrahim (2007): Some physical and nutritional properties of cowpea seed (Vigna sinensis L.). Journal of Food Engineering, 79, 1405-1409 https://doi.org/10.1016/j.jfoodeng.2006.04.022
Khoshtaghaza M.H., Mehdizadeh R. (2006): Aerodynamic properties of wheat kernel and straw materials. Agricultural Engineering International: CIGR Journal, VIII: FP 05007.
Masoumi A.A., Rajabipour A., Tabil L., Akram A.A. (2003): Terminal Velocity and Frictional Properties of Garlic (Allium sativam L.). Paper No. 03-330. The Canadian Society for Engineering in Agricultural, Food and Biological Systems.
Mehdizadeh R. (2000): Design and development of a wind tunnel for measuring of aerodynamic properties of agricultural products. [MSc Thesis.] Tehran, Tarbiat Modares University.
Mohsenin N.N. (1978): Physical Properties of Plant and Animal Materials. New York, Gordon and Breach Science Publishers, Inc.
Morel T. (1975): Comprehensive Design of Axisymmetric Wind Tunnel Contractions. Journal of Fluids Engineering, 97, 225- https://doi.org/10.1115/1.3447255
Nalbandi H., Seiiedlou S., Ghassemzadeh H.R. (2010): Aerodynamic properties of Turgenia latifolia seeds and wheat kernels. International Agrophysics, 24: 57–61.
Pope A., Barlow J.B., Rae W.H. (1999): Low-speed Wind Tunnel Testing. New York, John Wiley & Sons, Inc.
Rabbani H. (2002): Aerodynamic properties of chick pea. [Ph.D. Thesis.] Tehran, University of Tehran.
Rajabipour A., Tabatabaeefar A., Farhadi M. (2006): Effect of moisture on terminal velocity of wheat verities. International Journal of Agricultural Engineering, 8: 10–13.
Seyed M., Razavi A., Rafe A., Akbari R. (2007): Terminal velocity of pistachio nut and its kernel as affected by moisture content and variety. Journal of Agricultural Research, 2: 663–666.
Tabak S., Wolf D. (1998): Aerodynamic Properties of Cottonseeds. Journal of Agricultural Engineering Research, 70, 257-265 https://doi.org/10.1006/jaer.1998.0268
Tabatabaeefar A. (2003): Moisture dependent physical properties of wheat. International Agrophysics, 17: 207–211.
Tang J., Sokhansanj S. (1991): Determination of the breakage susceptibility of lentil seeds. Cereal Chemistry, 68: 647–650.