Previous experimental results on the evaporation of single fuel droplets due to forced convection with isotropic ambient turbulence are extended. Test fuels include pentane, hexane, heptane, octane and decane with Reynolds number in the range of 72-250 based on initial droplet diameter and relative velocity between droplet and free stream. Variations of ambient turbulence properties were achieved by a low-speed vertical wind tunnel with different turbulence intensities and scales, controlled by using different sizes of disk. The free-stream turbulence intensities are varied in the range from 1% to 60% and the integral length scales are from 2.5 to 20 times of the initial droplet diameter. Results show that the time history of droplet diameter follows the d2-law in turbulent environments with generally higher evaporation rates as compared with those in quasi-laminar cases. Normalized evaporation rate (to quasi-laminar case) due to turbulence is reasonably correlated with Dav. In addition, two distinct regimes separated by Dav≈O.l are identified. For Dav<0.1, normalized droplet evaporation rate increases with decreasing Dav, while it is nearly the same as that in quasi-laminar environment for Dav>O. 1.
|State||Published - 2001|
|Event||35th AIAA Thermophysics Conference 2001 - Anaheim, CA, United States|
Duration: 11 Jun 2001 → 14 Jun 2001
|Conference||35th AIAA Thermophysics Conference 2001|
|Period||11/06/01 → 14/06/01|