Abstract
It is difficult to remove the dust burried among the grass or a long pile of the carpet by using a conventional electric vacuum cleaner. Moreover, since the exhaust air from the cleaner contains a lot of small dust particles, this sometimes comes into question from the environmental viewpoint. For these reasons the sweeper with the "twin-swirl tube" has been newly developed by the authors. The air flow from this type of sweeper is introduced into the dust removal part and is used to fluidize and transport the dust. Therefore, it is easy to remove the dust, by using this method. Furthermore, the circulation of the flow in the sweeper has no influence on the environment. In this paper, the flow in this sweeper has been investigated by the flow visualization technique.
