A novel experimental technique for the investigation of gas-solids flow inpipes

An experimental rig was designed and commissioned to simulate the flow of g as-solid mixtures in pneumatic-conveying systems at industrial scales. In t he rig, the flow rates and pressures of the gas and solid can be closely co ntrolled by predefined control variables or by feedback, from a measured sy stem parameter. This technique overcomes the problems of scale experienced in most research laboratories and vendor test centres. It also permits a wi de range of operating conditions to be simulated in a short period of time using a small volume of the bulk material and hence reducing costs. Experim ents with different modes of flow were compared with each other and with th e works of other researchers. The advantages and current limitations of thi s approach are discussed. (C) 2000 Elsevier Science S.A. All rights reserve d.