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Decay Length for 180° Helicoidal Flow Flocculator


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1 Department of Civil Engineering, B. N. College of Engineering, Pusad-445 215, Maharashtra, India
 

The secondary flow in a helicoidal flow flocculator does not completely decay at the exit of the bend, but continues to a reasonable distance beyond the downstream end of the bend. This distance is called decay length. The paper aims at defining decay length on the basis of asymmetry of isovels and developing a relationship among the easily known parameters of straight channel and geometry of the curve. The proposed relationship is well comparable with the experimental values. The efficiency of flocculator have been tested in the laboratory and is found to be satisfactory.
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  • Decay Length for 180° Helicoidal Flow Flocculator

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Authors

P. V. Durge
Department of Civil Engineering, B. N. College of Engineering, Pusad-445 215, Maharashtra, India
P. B. Nagarnaik
Department of Civil Engineering, B. N. College of Engineering, Pusad-445 215, Maharashtra, India

Abstract


The secondary flow in a helicoidal flow flocculator does not completely decay at the exit of the bend, but continues to a reasonable distance beyond the downstream end of the bend. This distance is called decay length. The paper aims at defining decay length on the basis of asymmetry of isovels and developing a relationship among the easily known parameters of straight channel and geometry of the curve. The proposed relationship is well comparable with the experimental values. The efficiency of flocculator have been tested in the laboratory and is found to be satisfactory.