ISSN 2756-3685
International Journal of Enology and Viticulture Vol. 6 (8), pp. 001-008, August, 2019. © International Scholars Journals
Full Length Research Paper
Moisture-dependent physical properties of black grape (Vitis vinifera L.) seed
Ahmet Kiliçkan*, Necmiye Üçer and Ibrahim Yalçin
Department of Agricultural Machinery, Faculty of Agriculture, Adnan Menderes University, Aydin, Turkey.
Accepted 15 July, 2019
Abstract
The physical properties of black grape seed were evaluated as a function of moisture content. The average length, width and thickness were 5.66, 3.46 and 2.61 mm, respectively, at 8.26% d.b. moisture content. In the moisture range from 8.26 - 26.14% dry basis (d.b.), studies on rewetted black grape seed showed that the thousand seed mass increased from 23.39 - 24.82 g, the projected area was 13.58 - 18.07 mm2, the sphericity 0.656 - 0.692 and terminal velocity was 7.33 - 7.68 m s-1. The static coefficient of friction of black grape seed increased linearly against surfaces of four structural materials, namely, rubber (0.340 - 0.393), aluminium (0.196 - 0.270), stainless steel (0.247 - 0.337) and galvanised iron (0.322 - 0.397) as the moisture content increased from 8.26 - 26.14% d.b. The bulk density decreased from 626.1 - 613.1 kg m-3, true density from 1104.9 - 1052.6 kg m-3 and porosity from 43.34 - 41.76%, respectively, with an increase in moisture content from 8.26 - 26.14% d.b.
Key words: Black grape seed, physical properties, moisture content, terminal velocity.