Temperature fluctuations in particle-laden homogeneous turbulent flows

• Published in: International journal of heat and mass transfer 1998-12, Vol.41 (24), p.4081-4093
• Main Author: JABERI, F. A
• Format: Article
• Language: English
• Subjects: Computer simulation; Convection and heat transfer; Diffusion; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Isotropic turbulence; homogeneous turbulence; Multiphase and particle-laden flows; Nonhomogeneous flows; Nusselt number; Physics; Prandtl number; Pressure; Probability density function; Reynolds number; Specific heat; Turbulent flow; Turbulent flows, convection, and heat transfer; Two phase flow
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/S0017-9310(98)00162-8

The statistical behavior of the fluid and particle temperatures in homogeneous two-phase turbulent flows are investigated via direct numerical simulations. The effects of the flow Reynolds number Re sub( lambda )), the Prandtl number (Pr), the particle response time ( tau sub(p)), the ratio of specific heats ( alpha ), and the mass loading ratio ( phi sub(m)) on the fluid and particle temperature statistics are studied. The results show that the particle temperature intensity decreases as the magnitudes of tau sub(p), Pr, alpha , and Re sub( lambda ) increase. Also, by decreasing the magnitudes of alpha and/or Pr, the difference between the particle velocity and temperature diffusivity coefficients increases. The ratio of particle to fluid temperature intensities and the dissipation rate of the fluid temperature are affected by two-way coupling effects and decrease as the mass loading ratio increases. Additionally, with increased mass loading, the probability density function of the fluid temperature deviate more from the Gaussian distribution.