Materials science

Physics

Thermal diffusivity

Convection

Heat transfer

Buoyancy

Mechanics

Natural convection

Thermal

Thermodynamics

Financial economics

Convective heat transfer

Mass transfer

Thermal conductivity

Composite material

Economics

Evaporation

Volatility (finance)

International Journal of Heat and Mass Transfer

In this paper, a transient droplet evaporation model based on Arbitrary Lagrangian–Eulerian (ALE) frame, which tracks the liquid-gas interface evolution and fully couples heat and mass transfer in solid, liquid and gas domains, was used to study the spontaneous evaporation of water, methanol and 3MP droplet (with low to high volatility) on PTFE substrates with small thermal conductivities and Al substrates with large thermal conductivities. It was found that because of the fully coupled transportation processes in droplet evaporation, the duration of transient periods determined according to the judgment criterion based on whether droplet or substrate are very close to each other. The larger the droplet volatility and the smaller the substrate thermal diffusivity, the longer the period of transient stage (normalized) of droplet evaporation, with 33.3% of the droplet lifetime for 3MP on a PTFE substrate. The larger the volatility and the substrate thermal conductivity, the larger the contribution of convective...

Transient effects and mass convection in sessile droplet evaporation: The role of liquid and substrate thermophysical properties