CONTROL VORTEX POSITION IN A VERTICAL TUBE TO REDUCE SPRAY DEFECTS AND REVAMPING SIX-SIGMA IMAGE VERIFICATION TOOL

Ahmed M. Abed, Samir E. Farag

Abstract


Ideal-Standard factory sever from disturbance in covering Bathtubs with chemical painting liquid, this liquid must cover all surfaces by the same thickness, but the vortex appeared in the liquid make a bubbles cause a defect in the painting process. The repairing of this defect consumes more than 60% of spraying process time. The vortex must be controlled by determine vortex position to guarantee equal liquid distribution on bathtubs surfaces. Vortex flows are subject to a number of major structural changes involving very large disturbances when a characteristic ratio of azimuthally to axial velocity components is varied. This problem led to push liquid in the painting gun with different pressures, this difference is generate unbalance covers of chemical liquid on a Bathtubs. This phenomenon is one of the hydrodynamic instability problems led to spot burn bathtubs and reduce bathtubs resists against heating circumstances.

The results revealed that there are a total of three distinct modes of the disruption of the vortex core as Reynolds number (Re) and circulation number () of the flow were varied. The position was found to be dependent on both Re and of the flow. Whereas, for all Re values an increase in always results in moving the vortex position upstream for all Re values. The vortex position values are smaller for anti-clockwise flow direction than that, when vanes were set at clockwise flow direction for long and short tube

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