1022 THE EFFECT OF DROPLETS ON A FLOW PATTERNS, TURBULENCE AND HEAT TRANSFER IN A TWO-PHASE ROUND JET

抄録

This paper deals with the computational study of water droplets evaporation in the turbulent round gas jet. The Eulerian two-fluid and tracking Lagrangian models are employed for spray computation wherein the gas turbulence models using the second moment closure model. In the present study it is examined the influence of main parameters of two-phase flow, such as droplet diameter and droplet mass fraction, on the droplet evaporation process and flow structure in the gas-droplet jet. The axial gas velocity declines more slowly with a growth of droplets mass concentration in comparison with a one-phase jet. The increase in mass fraction of droplets results in contraction of two-phase gas-droplet jet. The dispersed phase acts to decrease the gas turbulence level, this influence becoming more pronounced with increase in the droplet mass concentration and initial size.