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Bracka M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2009

z. 93

17--18

Basis on the laboratory experiments analysis behavior of two-phase gas- suspend solid tlow is presented. Solid concentration at the flow suspension and influence of gas volume is described.

Laminarisation effect in fine-dispersive slurry flow

Bartosik A.

Archives of Thermodynamics

2008

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.