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Št. zadetkov: 5
About inverse Laplace transform of a dynamic viscosity function
Kamil Urbanowicz, Anton Bergant, Rafał Grzejda, Michal Stosiak
Izvirni znanstveni članek
Oznake: inverzna Laplaceva transformacija;analitična rešitev;vodni udar;dinamična viskozna funkcija;dinamika tekočin;tok v cevi;Calogero–Ahmedove vrste;inverse Laplace transform;analytical solution;water hammer;dynamic viscosity function;fluid dynamics;pipe flow;Calogero–Ahmed sums;
A dynamic viscosity function plays an important role in water hammer modeling. It is responsible for dispersion and decay of pressure and velocity histories. In this paper, a novel method for inverse Laplace transform of this complicated function being the square root of the ratio of Bessel function ...
Leto: 2022 Vir: Fakulteta za strojništvo (UL FS)
Navier-Stokes solutions for accelerating pipe flow
Kamil Urbanowicz, Anton Bergant, Michal Stosiak, Adam Deptuła, Mykola Karpenko
Pregledni znanstveni članek
Oznake: Navier-Stoksove enačbe;analitične rešitve;pospešujoč tok;cevni tok;kanalski tok;Navier–Stokes equations;analytical solutions;accelerated flow;pipe flow;
This paper reviews analytical solutions for the accelerated flow of an incompressible Newtonian fluid in a pipeline. This problem can be solved in one of two ways according to the (1) imposed pressure gradient or (2) flow rate. Laminar accelerated flow solutions presented in a number of publications ...
Leto: 2023 Vir: Fakulteta za strojništvo (UL FS)
Progress in analytical modeling of water hammer
Kamil Urbanowicz, Haixiao Jing, Anton Bergant, Michal Stosiak, Marek Lubecki
Izvirni znanstveni članek
Oznake: reservoir-horizontal pipeline-valve system;water hammer;transient laminar flow;analytical solution;frictionless system;quasi-steady friction;unsteady skin friction;
Analytical formulas for laminar water hammer in horizontal pipes were extended and simplified into a compact mathematical form based on dimensionless parameters: dimensionless time, water hammer number, etc. Detailed treatment of turbulent water hammer analytical solutions is beyond the scope of thi ...
Leto: 2023 Vir: Fakulteta za strojništvo (UL FS)
Water hammer simulation using simplified convolution-based unsteady friction model
Kamil Urbanowicz, Anton Bergant, Michal Stosiak, Adam Deptuła, Mykola Karpenko, Michał Kubrak, Apoloniusz Kodura
Izvirni znanstveni članek
Oznake: vodni udar;neustaljeno stensko trenje;hidravlični prehodni pojavi;konvolucijski model;računske simulacije;water hammer;hydraulic transients;unsteady friction;convolution-based model;numerical simulation;
Omission of frequency-dependent hydraulic resistance (skin friction) during modelling of the water hammer phenomenon is unacceptable. This resistance plays a major role when the transient liquid flow occurs in rigid-walled pipes (steel, copper, etc.). In the literature, there are at least two differ ...
Leto: 2022 Vir: Fakulteta za strojništvo (UL FS)
Modeling transient pipe flow in plastic pipes with modified discrete bubble cavitation model
Kamil Urbanowicz, Anton Bergant, Apoloniusz Kodura, Michał Kubrak, Agnieszka Malesińska, Paweł Bury, Michal Stosiak
Izvirni znanstveni članek
Oznake: retarded strain;cavitation;water hammer;unsteady friction;method of characteristics;
Most of today's water supply systems are based on plastic pipes. They are characterized by the retarded strain (RS) that takes place in the walls of these pipes. The occurrence of RS increases energy losses and leads to a different form of the basic equations describing the transient pipe flow. In t ...
Leto: 2021 Vir: Fakulteta za strojništvo (UL FS)
Št. zadetkov: 5
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