Temperature decay in two-phase turbulent flows

Direct numerical simulations of dilute two-phase flows are conducted to study the decay of the fluid and particle temperatures in isotropic turbulence. Both one-way and two-way coupling between phases are considered. The effects of the particle response time ( τ p), the Prandtl number ( Pr), the rat...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2000-03, Vol.43 (6), p.993-1005
Main Authors: Jaberi, F.A., Mashayek, F.
Format: Article
Language:English
Subjects:
Computer simulation
Convection and heat transfer
Direct numerical simulations
Exact sciences and technology
Fluid dynamics
Fluids
Fundamental areas of phenomenology (including applications)
Heat losses
Isotropic turbulence
homogeneous turbulence
Multiphase and particle-laden flows
Nonhomogeneous flows
Particles (particulate matter)
Physics
Prandtl number
Pyrolysis
Specific heat
Temperature
Thermal transport
Turbulent flow
Turbulent flows, convection, and heat transfer
Two phase flow
Two-phase turbulent flows
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Summary:Direct numerical simulations of dilute two-phase flows are conducted to study the decay of the fluid and particle temperatures in isotropic turbulence. Both one-way and two-way coupling between phases are considered. The effects of the particle response time ( τ p), the Prandtl number ( Pr), the ratio of specific heats ( α), and the mass loading ratio ( φ m ) on the carrier fluid and particle temperature statistics are studied. The results indicate that the variance of the fluid and particle temperatures, the dissipation rate of the fluid temperature and the high wavenumber values of the fluid temperature spectrum are increased as the magnitudes of φ m and/or αPr increase. The decay rate of the fluid and particle temperature variances are similar when the values of αPr are small. For large αPr values, the variance of the particle temperature is higher than that of the fluid and is strongly dependent on the initial conditions. The Lagrangian auto-correlation coefficient of the particle temperature ( R p T ) also behaves differently for different magnitudes of α and Pr. For small values of α, R p T decreases as the magnitude of particle response time increases. For large values of α, R p T increases with increasing τ p.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(99)00185-4