Mass Transfer in Oscillating Flows: Efficient Drying via Pulse Combustors. Annual Report January 1989-December 1989

摘要

The study addresses analytical and experimental methods for increasing industrial and home drying efficiency via pulse combustors. A fundamental scientific methodology is being developed (at the University of Michigan) for the momentum, heat and mass transfer in oscillating (on the mean) turbulent flows. The approach follows the intuitive ideas of Taylor and Kilmogorov on the construction of microscales of turbulence. A parallel experimental program is being carried out by the pulse combustor of the Continuous Combustion Laboratory of the Sandia-Livermore National Laboratories. A droplet sizing technique and a quasi-steady computer model have been developed. The unsteady analytical model will determine the range of the quasi-steady model and provide also a mass transfer correlation beyond this range. The scales of mass transfer in oscillating turbulent flows have been developed. A mass transfer correlation based on these scales has been proposed. The correlation agrees well with the results so far obtained in the experimental program.