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Reynolds number effects in the flow of a Bingham electrorheological fluid between fixed surfaces of revolution

Walicka A., Falicki J.

International Journal of Applied Mechanics and Engineering

2011

Vol. 16, no 1

195-210

Many electrorheological fluids (ERFs) as fluids with micro-structure demonstrate viscoplastic behaviours. Rheological measurements indicate that the flows of these fluids may be modelled as the flows of a Bingham fluid. Our concern in the paper is to examine the pressurized laminar flow of an ERF of a Bingham type in a narrow clearance between to fixed surfaces of revolution. In order to solve this problem the boundary layer equations are used. The Reynolds number effects (the effects of inertia forces) on pressure distribution are examined by using the averaged inertia method. Numerical examples of externally pressurized flows in the clearance between parallel disks and concentric spherical surfaces are presented.

Studies of hydraulic resistance in polypropylene pipe fittings

Cisowska I.

Structure and Environment

2009

Vol. 1, no. 1

53-58

The results of studies of local hydraulic resistance in polypropylene segmental elbows (R/d ≤ 1) and bends (R/d > 1) in systems of two or more pipe fittings connected in series are analyzed. Qualitative and quantitative formulas for the coefficient of local resistance in pipelines built from elbows and bends connected conformingly (forming spiral loops) or alternatinvely (forming sinusoidal waves) are presented.