DRAG COEFFICIENTS OF SPHERICAL LIQUID DROPLETS .1. QUIESCENT GASEOUS FIELDS

The drag coefficient of non-evaporating, spherical, liquid droplets in quiescent gaseous fields is measured using a novel experimental metho dology al Reynolds numbers from 20 to 120. The experimental uncertaint ies are typically less than 8 percent, and the results are on average within 6 percent of the drag coefficient of liquid and rigid spheres, based on an accepted relationship. The methodology described in this a rticle is therefore validated so it can be extended with confidence to measurements in turbulent gaseous fields.