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Laminarisation effect in fine-dispersive slurry flow

100%

Bartosik A.

2008

tom Vol. 29, no. 3

69-82

Adding of solid particles or bubbles to the carrier liquid can modify the laminar-turbulent transition. Fine particles enhance the effective viscosity of the slurry and this may by expected to delay the transition to turbulence. The paper presents experimental data of slurry flow of fine particles with the mean particle diameter of 10 [mu]m in horizontal circular pipe. Rheological measurements allow assuming that the slurry can be approximated by the Bingham model. By using the different approach towards calculation of the Reynolds number, the measured and predicted velocity profiles of Bingham slurry were compared to see quantitative difference in interpretation of the laminar-turbulent transition. For the slurry flow of fine particles it was shown that the laminar-turbulent transition exists for higher Reynolds number than we expect. In case of the laminar flow the velocity profiles possess sheared and unsheared part, while in the turbulent flow the unsheared part does not exist. The results of the research are presented as figures and conclusions.

Analiza powierzchni swobodnej filmu cieczy o złożonych właściwościach reologicznych

84%

Broniarz-Press L. , Dulska D.

2006

tom Nr 6s

22-24

The studies presented were focused on the effect of polymers and surfactants additives on changes in the free surface of liquid falling film. The suppression of surface waves and the decrease of the mean film thickness have been observed. Total decay of waves on the free surface in surfactant solutions can be explained by flow laminarization and by the formation of internal shear-induced structures.