An experimental study has been performed to obtain the effect of relative velocity between droplet and ambient flow on the evaporation rate constant of a nheptane free droplet of 180 μm in diameter flying in a hot and normal pressure air flow. Measurements of droplet diameter and velocity were conducted in a series of time elapsed by an electrically controlled optical system. From the experimental results, an empirical equation associated with the relation between evaporation rate constant and relative velocity was obtained.
