EVAPORATION OF WATER DROPLETS MOVING THROUGH HIGH-TEMPERATURE GASES

With the use of high-speed recording and diagnostic facilities, an experimental study has been made of the evaporation of droplets (of characteristic size R_m ≈ 0.05–0.035 mm) of atomized fl ow of water-based suspensions with typical soil impurities (silt and clay) moving in a high-temperature (about 1100 K) gaseous medium (with the example of acetone combustion products). The relative mass concentration of soil components in the suspension was varied over the range of γ = 0–1%. A strong infl uence of the above impurities on the main characteristic of evaporation — the relative change in the droplet radius ΔR — has been established. The infl uence of the initial temperature (varied over the range of T_w = 278–320 K) of the atomized suspension on the evaporation rate of the latter has been determined. It has been shown that the values of integral characteristics of the process of evaporation of suspensions with soil impurities can be much (2–3 times) higher than for water without these components.
   
Author:  G. V. Kuznetsov and P. A. Strizhak
Keywords:  droplet, suspension, soil impurities, high-temperature gases, heat transfer, evaporation, high-speed video recording
Page:  97