Zbigniew Matras
Technical Transactions, Mechanics Issue 1-M (6) 2015, 2015, pp. 49-58
https://doi.org/10.4467/2353737XCT.15.270.4673A comparative analysis of drag reduction efficiency through the use of surfactants and high molecular polymer additives has been performed. Results document that for polymer micellar solutions, the stable transitional zone between the laminar flow and the turbulent flow becomes extended towards higher Reynolds number values. The existence of a third extended drag reduction zone in the turbulent range of flow is also observed. It follows that the analysed polymer-micellar solutions combine and intensify positive features of their purely polymer and micellar analogues providing a more efficient drag reduction effect in wider range of flow.
Zbigniew Matras
Technical Transactions, Mechanics Issue 1-M (6) 2015, 2015, pp. 39-48
https://doi.org/10.4467/2353737XCT.15.269.4672The transformation of pseudo-Newtonian dimensionless numbers: Re and fs, describing flow of power-law non-Newtonian fluids in circularly curved tubes, has been done. It has been shown that the multi-parameter friction curves of power-law non-Newtonian fluid can be described, in new dimensionless coordinate system, with the help of single curve in the laminar as well as turbulent flow region. Moreover, the criterion of transition from laminar to turbulent region was clearly determined.
Zbigniew Matras
Technical Transactions, Mechanics Issue 2-M (3) 2016, 2016, pp. 1-1
https://doi.org/10.4467/2353737XCT.16.106.5505The paper presents polymer-micellar aggregates as efficient drag reducers of the energy losses in straight pipe flow. A small amount of high molecular polymers: Polyethylene Oxide, Cetyltrimetyl Ammonium Bromide surfactant and Sodium Salicylate salt additives, are applied to obtain polymer-micellar aggregates formation. An analysis of how polymermicellar additives influence the shape and character of flow resistance curves has been performed. It is documented that for polymer-micellar solutions the stable transitional zone between, the laminar and the turbulent flows are extended toward higher values of the Reynolds number. Occurrence of the third turbulent zone of drag reduction is also observed.