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pro vyhledávání: '"Brkic, Dejan"'
Autor:
Praks, Pavel, Rasmussen, Atgeirr, Lye, Kjetil Olsen, Martinovič, Jan, Praksová, Renata, Watson, Francesca, Brkić, Dejan
Publikováno v:
In Heliyon 30 November 2024 10(22)
Publikováno v:
In Resources Policy August 2024 95
Autor:
Praks, Pavel, Brkic, Dejan
Publikováno v:
Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria (RIMNI), International Journal of Numerical Methods for Calculation and Design in Engineering 2020 36(3), article 41
Using only a limited number of computationally expensive functions, we show a way how to construct accurate and computationally efficient approximations of the Colebrook equation for flow friction. The presented approximations are based on the asympt
Externí odkaz:
http://arxiv.org/abs/2005.07021
Autor:
Brkić, Dejan, Praks, Pavel
Publikováno v:
Brki\'c, D.; Praks, P. Short Overview of Early Developments of the Hardy Cross Type Methods for Computation of Flow Distribution in Pipe Networks. Appl. Sci. 2019, 9, 2019. https://doi.org/10.3390/app9102019
Hardy Cross originally proposed a method for analysis of flow in networks of conduits or conductors in 1936. His method was the first really useful engineering method in the field of pipe network calculation. Only electrical analogs of hydraulic netw
Externí odkaz:
http://arxiv.org/abs/1904.08488
Autor:
Brkic, Dejan, Praks, Pavel
Publikováno v:
Brki\'c, D.; Praks, P. An Efficient Iterative Method for Looped Pipe Network Hydraulics Free of Flow-Corrections. Fluids 2019, 4, 73
Original and improved version of the Hardy Cross iterative method with related modifications are today widely used for calculation of fluid flow through conduits in loops-like distribution networks of pipes with known node fluid consumptions. Fluid i
Externí odkaz:
http://arxiv.org/abs/1903.04298
Akademický článek
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Autor:
Brkić, Dejan, Praks, Pavel
Publikováno v:
Brki\'c, D.; Praks, P. Accurate and Efficient Explicit Approximations of the Colebrook Flow Friction Equation Based on the Wright {\omega}-Function. Mathematics 2019, 7, 34., https://doi.org/10.3390/math7010034
The Colebrook equation is a popular model for estimating friction loss coefficients in water and gas pipes. The model is implicit in the unknown flow friction factor f. To date, the captured flow friction factor f can be extracted from the logarithmi
Externí odkaz:
http://arxiv.org/abs/1810.10273
Autor:
Brkic, Dejan, Praks, Pavel
Publikováno v:
Brkic, D.; Praks, P. Unified Friction Formulation from Laminar to Fully Rough Turbulent Flow. Applied Sciences 2018, 8(11), article no. 2036
This paper gives a new unified formula for the Newtonian fluids valid for all pipe flow regimes from laminar to the fully rough turbulent. It includes laminar, unstable sharp jump from laminar to turbulent, and all types of the turbulent regimes: smo
Externí odkaz:
http://arxiv.org/abs/1810.01951
Autor:
Praks, Pavel, Brkic, Dejan
Publikováno v:
Praks, P.; Brki\'c, D. Symbolic Regression-Based Genetic Approximations of the Colebrook Equation for Flow Friction. Water 2018, 10(9), 1175
Widely used in hydraulics, the Colebrook equation for flow friction relates implicitly to the input parameters; the Reynolds number, and the relative roughness of inner pipe surface, with the output unknown parameter; the flow friction factor. In thi
Externí odkaz:
http://arxiv.org/abs/1808.10394
Autor:
Praks, Pavel, Brkic, Dejan
Publikováno v:
Praks, P.; Brki\'c, D. Choosing the Optimal Multi-Point Iterative Method for the Colebrook Flow Friction Equation. Processes 2018, 6(8), 130
The Colebrook equation $\zeta$ is implicitly given in respect to the unknown flow friction factor $\lambda$; $\lambda=\zeta(Re,\epsilon^*,\lambda)$ which cannot be expressed explicitly in exact way without simplifications and use of approximate calcu
Externí odkaz:
http://arxiv.org/abs/1808.03568