In our field testing area we have several small-scale pneumatic transport testing set-ups with radius bends and mitered bends to study the impact of various variables on conveying by means of pneumatic transport: the number of bends, type of bend, air velocity, dense phase vs. dilute phase.
This enables to determine in an early stage of the process design and product development whether the product properties are suitable for conveying by means of pneumatic transport. The wear or break-down of particles upon pneumatic transport can also be studied by e.g. formation of fines, by changes in particle size distribution or by changes in particle morphology. In this way, the critical type of bend and number of bends can be identified as different products typically display a unique behaviour with respect to attrition and abrasion. Particle impacts by normal forces in a mitered bend can easily induce attrition whereas sliding along the wall in a radius bend would cause more abrasion-type of wear.