Moisture-dependent physical properties of grape (Vitis vinifera L.) seed

Issue Date

6-2002

Abstract

Some physical properties of grape (Vitis vinifera L.) seeds were determined as a function of seed moisture content varying from 16.55-5.21% (dry basis). The average values of seed length, width, thickness, geometric mean diameter, surface area filling angle of repose and terminal velocity decreased linearly with a decrease in the moisture content from 8.28-7.74 mm, 4.5-4.26 mm, 3.32-3.12 mm, 4.97-4.68 mm, 77.86-68.98 mm2, 27.53-23.78° and 6.8-6.3 m s -1, respectively. The unit mass decreased nonlinearly from 0.056-0.049 g whereas the variation of sphericity was not statistically significant with a decrease in moisture content. The bulk density increased nonlinearly from 577.3-586.6 kg m -3, while the true density and porosity decreased nonlinearly from 886.2-873.7 kg m -3, and 34.85-32.86%, respectively, when the moisture content decreased from 16.55-5.21%. The static coefficient of friction decreased linearly from 0.38-0.18, 0.37-0.22, 0.5-0.41, 0.38-0.2 and 0.48-0.4 for glass, fiberglass, plywood, galvanized iron sheet and rubber, respectively. The static coefficient of friction of plywood surface was highest at all moisture contents investigated.

Source or Periodical Title

Philippine Agricultural Scientist, The (Formerly: The Philippine Agriculturist)

ISSN

0031-7454

Volume

92

Issue

2

Page

201-212

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Frequency

quarterly

Physical Description

illustrations; graphs; references

Language

English

Subject

frictional properties, geometrical properties, grape seed, gravimetrical properties

En – AGROVOC descriptors

VITIS VINIFERA; GRAPE SEEDS; SEED MOISTURE CONTENT; CHEMICOPHYSICAL PROPERTIES; GRAVIMETRY

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