Abstract:
The dynamic of a sessile droplet spread of a wetting
Newtonian fluid into a porous substrate in the presence of
evaporation and chemical reaction is considered. The function
for capillary pressure is found to be different from the classic
Leverett-udell function. The evaporation and chemical reaction
are fully coupled with the porous media flow with impact on
the continuity, momentum, and energy equations. The multiphase
and multi-component Navier-Stokes equations for sessile
droplets in a porous medium going through phase change and
chemical reaction are solved explicitly on a finite difference
mesh and the results are validated with laboratory and open air
experimental data. The Runge-Kutta fourth order method is
used to integrate the governing equations in time. In the model,
chemical reactions are allowed among all phases; solid, liquid,
and vapor. The local properties are functions of the species or
phases that are present therefore, varying in time. Pesticides
and any chemical that is released into the environment can
evaporate and may also enter a chemical reaction with other
pre-existing chemicals or simply moisture in the environmental
substrates. The technique is proven to be very accurate and
robust with widespread applications in defense, environmental
safety, pharmaceuticals, and medical fields.
Description:
Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .
