Abstract
The evaporation of a moving liquid drop has been investigated. The drop experiences an evaporation-induced radial velocity field while undergoing slow translation. In view of the large evaporation velocity, the flow field is not in the Stokes regime. Consequently, both the viscous and the inertial terms have been retained in the governing equations. While the flow and the transport processes in the gaseous phase and the droplet internal circulation are treated as quasisteady, the droplet heating is regarded as a transient process. The transport properties of the gaseous phase have been considered variable. The transport equations of the gaseous phase require analysis by a singular perturbation technique. The transient heating of the droplet interior is solved by a series truncation method. The solution of the total problem is obtained by coupling the results for the gaseous and liquid phases. The enhancement in the evaporation rate due to convective motion has been predicted. The friction, the pressure, and the evaporation drag coefficients have been individually predicted, and the total drag coefficient behavior has been discussed.
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