In this work, a computational method was used for the prediction of water transmission failure. The proposed method allowed for any arbitrary combination of devices in the water pipeline system. The method used was by a scale model and a prototype (real) system for a city main water pipeline where transient flow was caused by the failure of a transmission system.
AbbreviationsTime (s) λ 0 Unit of length p Pressure (N/m 2 ) α Pipe cross section area (m 2 ) V Velocity (m/s) s Length (m) f Friction factor τ Shear stress (Pa) H 2 -H 1 Pressure difference (m-H 2 O) C Surge wave velocity (m/s) V Volume (m 3 ) F Fluid force (N) W Frequency q Flow rate (m 3 /s) D Diameter of each pipe (m) μ Fluid dynamic viscosity (kg/m s) R Pipe radius (m) γ Specific weight (N/m 3 ) ν Fluid dynamic viscosity (kg/m s) J Junction point (m) y Surge tank and reservoir elevation difference (m) K Volumetric coefficient (GN/m 2 ) T Period of motion A Pipe cross-sectional area (m 2 ) 678 K.H. Asli et al. dp Is subjected to a static pressure rise (m) h p Head gain from a pump (m) h L Combined head loss (m) E ν
This article investigates the pulsating flow of a compressible two-phase bubble of viscous fluid contained in an elastic orthotropicle direct axis tube. In this work, one-dimensional linear equations have been used. It is assumed that the tube is rigidly attached to the certain environment. In the case of finite length the pressure is applied at the end of its faces. In the limited process, relations obtained for a very long tube. Such a description, in a sense generalizes and strengthens the work of this type. In the numerical experiment a semi-infinite tube with flowing water containing small amount of air bubbles is considered. The influence of volume fraction of bubbles on wave characteristics is determined.
In this paper, the structure of a liquid and character of its flow in carbon nanotube is investigated. A review of the literature and the results of experiments show that the simulation of fluid flow for nanoscale systems should be based on the continuum hypothesis taking into account the quantized character of the liquid in the length scale of intermolecular distances. Consideration of the flow characteristics allowed construction of the analogy of behavior of the liquid in a nanotube with a flow of a viscoplastic Bingham fluid. A model of mass transfer of liquid in a nanotube, based on the possibility of forming an empty interlayer between the moving fluid particles and the particles of the wall of the nanotube, is presented.
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