New explicit correlations for turbulent flow friction factor

Friction factor correlations for laminar, transition and turbulent flow in smooth pipes

In this paper we derive an accurate composite friction factor vs. Reynolds number correlation formula for laminar, transition and turbulent flow in smooth pipes. The correlation is given as a rational fraction of rational fractions of power laws which is systematically generated by smoothly connecting linear splines in log-log coordinates with a logistic dose curve algorithm. This kind of corre...

development of an explicit eulerian method for treating particle laden turbulent flow in dust collectors

Evolutionary Optimization of Colebrook’s Turbulent Flow Friction Approximations

This paper presents evolutionary optimization of explicit approximations of the empirical Colebrook’s equation that is used for the calculation of the turbulent friction factor (λ), i.e., for the calculation of turbulent hydraulic resistance in hydraulically smooth and rough pipes including the transient zone between them. The empirical Colebrook’s equation relates the unknown flow friction fac...

Dynamical turbulent flow on the Galton board with friction.

We study numerically and analytically the dynamics of charged particles on the Galton board, a regular lattice of disk scatters, in the presence of constant external force, magnetic field, and friction. It is shown that under certain conditions friction leads to the appearance of a strange chaotic attractor. In this regime the average velocity and direction of particle flow can be effectively a...

Semi-Empirical 3D Rectangular Channel Air Flow Heat Transfer and Friction Factor Correlations

This paper presents correlations for heat transfer and friction coefficients for combined entry region airflow in 3D rectangular channel as functions of channel depth, Reynolds number, hydraulic diameter, and channel aspect ratio. The correlations were designed to approach known physical limits as the channel aspect ratio and channel depth approach zero, and as the flow becomes fully developed....