Abstract
The large amounts of nitrogen, phosphorus, etc. to be exhausted are causing the eutrophication problem, and it is recognized as a social issue. Moreover, on the bottom of the water stream there is eutrophicated, high density accumulation mud. They cause the abnormal occurrence of algae. Although those substances were transported together with large volumes of water or seawater, the separation of the gas-liquid after the transportation was not easy. Due to the return to the sea of the water which was transportation medium, the micro soil particle contained in that water were diffused in that water area, then this kinds of the method was prohibited in concern with the pollution of the fishery. Then, it is the compressed air transportation to attract much attention. This method has the advantage to be able to transport at high speed by the intermittent flow; “slug flow”, by supplying into the conduit the compressed air and the transportation medium simultaneously. This is the hydraulics study to analyze the phenomena of flowing characteristic and the process of “slug flow”, as a basic research of the technological application of the slug flow.
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