MEASURING GRAIN AND LEGUME SEED DENSITY USING PYCNOMETER AND ENVELOPE DENSITY ANALYZER

作者：Fasina O O^*

来源：Transactions of the ASABE, 2010, 53(4): 1223-1227.

• Density
• Grains
• Legumes
• Physical properties
• Porosity
• Seed

Seed (or particle) density is one of the most important physical properties of agricultural materials because it is needed in process design calculations and it is used in the characterization of these materials. Depending on the measurement system used, seed density can be either true seed density or envelope seed density. However, when seed density measurements are reported in the agricultural, food, and bioprocess engineering literature, the seed density type is often not specified, and it is usually assumed that the true seed density is the same as the envelope seed density. This technical note will show that this is not the case for nine grains and legumes (wheat, white rice, brown rice, corn, popcorn, lima bean, black-eyed pea, chickpea, and pinto bean). In general, the envelope seed density was up to 26% lower than the true seed density The magnitude of the difference between the two densities was significantly affected by moisture content. Results from pressure drop calculations showed that the incorrect use of seed density can affect the accurate design of processes and equipment used for handling, storing, and transporting agricultural materials.

• 出版日期2010-8