科研之友
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摘要
The equation of probability distribution function for mean fiber orientation, and the equations of Reynolds averaged Navier-Stokes, turbulence kinetic energy and turbulence dissipation rate with the additional term of the fibers are derived and solved numerically. The effects of fiber concentration and fiber aspect-ratio on the mean velocity profile, turbulent kinetic energy and turbulent viscosity are analyzed. The results show that the mean axial velocity gradient increases near the centerline and decreases near the outside, respectively, as the fiber concentration increases. The mean axial velocity decreases with increasing the fiber concentration at the same radial positions. The centerline mean axial velocity decreases with axial distance, and this phenomenon is more obvious as the fiber concentration increases. The turbulent kinetic energy and turbulent viscosity increase over the jet region with an increasing fiber concentration. The variation tendency of mean axial velocity, turbulence kinetic energy and turbulence viscosity with fiber aspect-ratio is the same as that with fiber concentration. The difference is that the variation with fiber concentration is more obvious than with fiber aspect-ratio.
