Molecular dynamics simulation and measurement of contact angle of water droplet on a platinum surface
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Date
2001-11Author
Kandlikar, Satish
Maruyama, Shigeo
Steinke, Mark
Kimura, Tatsuto
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Show full item recordAbstract
A water liquid droplet in contact with a platinum surface
was simulated by the molecular dynamics method. Water
molecules were modeled by SPC/E and one layer of harmonic
molecules represented the platinum surface with the constant
temperature heat bath model using the phantom molecules.
Here, the water-platinum pair potential developed by Spohr
(1989) based on extended Hückel calculations was employed.
In the spreading process of the liquid droplet on the platinum
surface, the area of contact region between water and platinum
expanded just in proportional to the one-third power of time.
This spreading rate was clearly in contrast to the case of
Lennard-Jones droplet.
The contact angles of water on a platinum surface under
saturated conditions are measured. The measurements are made
in a vacuum container using de-ionized and degassed water on a
clean platinum surface. The equilibrium static, advancing and
receding contact angles are measured by changing the
orientation of the platinum surface. The droplets of different
masses are placed on the horizontal platinum surface. The
surface is the inclined to 20, 30 and 40 degrees. The advancing
and receding contact angles under these conditions are
measured.
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