Investigation on fluid-particle velocity double correlation in fluid- particle two-phase turbulent flows

유체에 입자가 부상된 2상난류운동에서 유체-입자속도 2차상관관계에 관한 연구

An analysis of radiative heat transfer has been conducted on axisymmetric finite cylindrical media. It is assumed that the temperature in the media is uniformly distributed and the boundaries are diffusely emitting and reflecting at a constant temperature. The scattering phase function is represented by the delta-Eddington approximation to account for highly forward scattering by particulates just as in the combustion system. Exact numerical solutions are obtained by Gaussian quadrature method and compared with P-1 and P-3 approximation solutions to verify their engineering application limit. The effects of optical thickness, scattering albedo, wall emissivity and aspect ratio are investigated. The results show that P-3 approximation is found to be in good agreement with the exact solution.

본 연구에서는 입자유동을 연속유체(continuous fluid)라 간주하는 2유체모델 을 적용하였고(Fig.2 참조), 실제 유동으로 2상난류제트유동, 관유동에 개발된 모델을 적용하여 모델의 타당성을 검토하였다.