Prediction of sessile drop evaporation considering surface wettability

On the lifetimes of evaporating droplets with related initial and receding contact angles

“…[6][7][8][9][10][11][12][13][14] is one in which an initial stick phase is followed by a first slide phase with constant contact angle and a second slide phase in which both the contact radius and the contact angle vary. In practice, the second slide phase can be relatively short compared to the other two phases, and so Nguyen and Nguyen, 15 Dash and Garimella, 14 and Stauber et al 16 considered a simple but effective model for an idealised SS mode in which the second slide phase is entirely neglected and initially the droplet evaporates in a CR phase in which R = R 0 and θ(t) and V (t) decrease until θ(t) reaches the receding contact angle θ * (0 ≤ θ * ≤ θ 0 ), at which the contact line depins and subsequently the droplet evaporates in a CA phase in which θ(t) = θ * and R(t) and V (t) decrease to zero at time t = t SS , where t SS (which depends on both θ 0 and θ * ) denotes the lifetime of the droplet.…”

Prediction of water droplet evaporation on zircaloy surface

“…The droplet evaporates slowly into the environment, which implies a quasi-equilibrium process. In general, the evaporation rate of a water droplet into the ambient air is modeled by Fick's law [8,9],…”

“…where Q, D, A, c, and r are the evaporation rate, vapor diffusivity in air, the surface area of the droplet undergoing diffusion, the vapor concentration, and the radial distance, respectively. From Equation (2), the droplet volume change with time can be obtained as below [8,9]:…”

“…Song et al [8] performed experiments on droplet evaporation using 10 kinds of surfaces with a wide range of contact angles. They reported that the evaporation rate of a droplet is influenced by the surface condition and material as well as the contact angle.…”

“…Using their experimental data, they proposed simple contact angle functions for all surfaces to predict the volume change of an evaporating droplet. Based on the works mentioned above, the foregoing approaches (Equations (4), (7) and 8) considering only the geometry of an evaporating droplet on a surface still have a limitation in explaining the differences in the evaporation behavior on various surfaces [8]. In addition, the surface materials and conditions having the same initial contact angle may have different contact angle functions from each other.…”