The transient cooling of an evaporating water droplet, supsended in a jet of dry air, has been studied experimentally, using thermochromic liquid crystal thermography. Microencapsulated beads of thermochromic liquid crystals, suspended in the water droplets, enabled the visualization of the transient temperature fields within the droplets. Digital movies of the convectively cooled droplets reveal spatial and temporal temperperature gradients resolved down to length scales of approx 100 mu m and time scales of approx 0.03 seconds. The transient temperature measurements were analyzed to yield total droplet covective heat transfer rates. Droplet heat transfer rates convective heat transfer rates. Droplets compare favorably to previously published measurements.
展开▼
