Dr hab. inż. Jan Kempiński

Dr inz. Zbigniew Smilgin

Sewage tubular transportation

The knowledge of the physical, rheological and hydraulic parameters of sewage is required for proper dimensioning of the technological lines of tubular transportation at sewage plants. The authors investigated sewage sediments that originated at the Varsovian sewage treatment plants. Flow tests of sediments were performed with the tubular system of diameter D=0,0207 m and allowed the determination of rheological and hydraulic profile of the tested medium. The description of rheological behavior of the sediments was based on the three-parameter Herschel-Bulkley's model as a function of mass concentration cs. The authors suggested usage of the dimensionless criterion λ(Regen) as a base for pipelines design. ...

Dr inż. Robert Głowski

Prof. dr hab. inż. Włodzimierz Parzonka

Dr hab. inż. Jan Kempiński

Prof. dr hab. Hartmut Eckstädt

Reological characteristics of sedimentation process and erosion of river sediments

The authors performed an estimation of the dynamic of the river bed changes caused by sedimentation and erosion processes. The physical and rheological parameters for chosen cohesive and semi-cohesive sediments were investigated. Mud samples were taken from 3 different localisation on Middle Odra (Poland) and from 2 localisations on Warnow river (Germany). Rheological characteristics were studied with use of the rotative viscometer. Erosion characteristics of the mud’s were studied accordingly to methodology of Migniot [1968]. Results for Middle Odra were verified in the natural scale during the passage of the catastrophic flood through barrage Brzeg Dolny in 1997. This flood caused partly erosion of mud’s from the upstream part of this barrage. ...