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The impact of the size and shape of a selected group of herbs (dried juniper berries  Juniperus communis, dry blueberries  Vaccinium myrtillus, petals of cornflower  Centaurea cyanus) on the value of the volatility coefficient, the coefficient of sphericity and the critical speed was analysed in the presented research. A laboratory anemometer to measure the speed of air was used. The determination of the volatility coefficient of particular size fractions was conducted on the basis of critical speed values, calculated as an average established after five measurements. The established aerodynamic properties of particular mixtures allow the determination and the assessment of differences among fractions of valuable resources and different impurities. The presented data might constitute a basis to determine the scope of differences among them and establish interrelations which allow the application of proper parameters for the pneumatic separation process in practice

The impact of size and shape of particles of undergrowth and herbs mixtures on aerodynamic properties