Notice of RetractionCFD simulation of air removal from gas-existed water supply pipe-bridge

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

In water supply system, pipe-bridge is prevalent used for distributing water. The presence of air in water supply system causes a lot of harm. The object of this paper is to deal with the simulation of air removal from gas-existed water supply pipe-bridge. A three dimensional model of pipe-bridge using VOF method, which including k~ε turbulence model, for predicting the air pockets forming as well as the air removing from the downward sloping pipeline was implemented in a CFD package. The results show that air tends to form large air pocket in downward sloping pipe and forms a hydraulic jump entraining air to the flow. Due to the air existence, it makes more head loss than the one without any gas. Air is pumped into water at a higher rate than the flow could handle and the excess air blew back to the air pocket. The smaller bubbles could move more easily than the larger ones, while the smaller ones would gradually coalesce into large bubbles and travel up the pipe then pass back to the air pocket again.