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1 International Journal of Applied Mechanics and Engineering

1 2005

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Effect of elbows and sudden contraction of cross-section on drag reduction effect in surfactant solution flowing in pipe system

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Broniarz-Press L. , Różański J. , Szczecina T.

International Journal of Applied Mechanics and Engineering

2005

tom Vol. 10, no spec

69-75

The effect of the local frictions on drag reduction in a flow of surfactant solutions in the pipeline system has been studied. The experimental tests for aqueous solutions of hexadecyltrimethylammonium chloride of the concentration of 50, 100 and 150ppm, have been carried out. The flow in straight tubes as well in the pipeline system elements such as elbows and sudden contraction in cross-section has been tested. On the basis of the experimental data it was shown that the presence of the elements giving the local resistances in the pipeline system will bring about the decrease in flow drag reduction effect. The effect can be explained by existing in the systems tested the additional stresses caused by the constructional elements. The additional stresses cause the partial destruction of the shear induced structure SIS (responsible for the flow stabilization) and the decrease of the drag reduction effect.