AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Development of a Special Dust Feeder for Long-Term Aerosol Generation from Poor Flow Dust Materials
STEPHAN GROSSE, Topas GmbH
Abstract Number: 711 Working Group: Instrumentation and Methods
Abstract A wide range of scientific and industrial aerosol applications requires submicron airborne dust particles due to their very special property profile. This includes filtration, pharmaceutical and polymer industry as well as surface treatment, environmental and occupational safety applications. But because of the special characteristics of submicron particles most of the common feeding and aerosol generating instrumentations do not show a reliable continuous operation anymore especially at low feeding rates. A proper material handling is strongly affected by adhesion effects which are significantly increasing at decreasing particle size. This poster will present a new patented concept of generating aerosols from submicron dust particles such as aluminium oxide, titanium dioxide and soot. As a closed cycle feeding technique is applied a continuous non-stop operation with a constant particle output rate is realised. The feeding rate is adjustable by certain instrument settings in a range between milligrams per hour up to several grams per hour. Because the material is not impacted feeding fluctuations from different levels of dust impaction are avoided a priori. The feeding behaviour of different particle materials depends only on bulk properties as there is a loose bulk feeding. Furthermore this instrument has been designed with a minimum of contact surfaces to minimise adhesion effects and attrition. The main focus of this poster will be validation of this new aerosol generating technique for testing cleanable filter media according to new ISO 11057 standard.