Dimensionless criterion lambda (Re sub (gen)) for plastic and viscous mixture flows in laminar flow zone
2000
Kempinski, J. (Agricultural University, Wroclaw (Poland). Inst. of Environmental Engineering)
The knowledge of the rheological characteristics of a mixture allows defining the hydraulic losses in horizontal pipelines on the basis of dimensionless criterion type lambda (Re sub (gen)), where lambda is the pipe resistance dimensionless coefficient from Darcy-Weisbach formula and Re sub (gen) is the generalized Reynolds number for the adopted rheological model. In order to describe the rheological character of plastic and viscous mixtures, the 3-parameter generalized Vocadlo model was applied. The complete generalized Reynolds number Re sub (v) for Vocadlo model was formulated. The estimation of relative error Re sub (v) value determination for laminar flow was conducted for 2 cases: when the yield point tau sub (o) is taken into account and when it is not considered
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