hi all... Currently i have new assignment to study how to minimise or eliminate the incineration fly ash deposition inside the circular horizontal ducting. The fly ash is a product of combustion process of hazardous industrial waste in a fludised bed reactor which using a silica sand as an innert material. The fluid flow is from the vertical to horizontal direction..(90 degree bend).. I intend to use CFD Fluent for analysis of the flow pattern..Did anyone here : i) have any idea how to start with some litrature study for this case.. ii) have any material or link to webpage or journal related to this issue.. Thanks and best regards.