Postdoc Directory

Apiano Morais UVA office

Apiano Ferreira de Morais Neto

School of Engineering and Applied Science
4342491706
Department
Aerospace and Mechanical Engineering
Mentor/Advisor
Carl Knospe
Degrees
PhD in Physics (2011)
Universidade Federal do Ceará (Federal University of Ceara), UFC, Brazil

Thesis: Escoamento de fluidos complexos e transporte de partículas em geometrias irregulares (Flow of complex fluids and particle transport in irregular geometries)
Advisor: José Soares de Andrade Junior. 

Grant: Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, Brazil. 
Masters in Physics (2006)
Universidade Federal do Ceará (Federal University of Ceara), UFC, Brazil

Thesis: Chaveamento de Pulsos Ultracurtos em Grades de Bragg Não-lineares de Fibras Ópticas (Ultrashort pulse switching in fiber Bragg gratings)

Advisor: Antônio Sérgio Bezerra Sombra.

Grant: Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, Brazil.
Bachelor in Physics (2004) 
Universidade Federal do Ceará (Federal University of Ceara), UFC, Brazil

 

When a solution is placed on a surface, it presents a characteristic shape depending on the surface tension between the solution and the surrounding fluid (typically air). If one puts a droplet of this solution over a dielectric slab and then one applies a difference of electric potential between the droplet and the bottom of the dielectric, the shape of the droplet will be modified. This modification of the wetting properties of a surface  with an applied electric field is called electrowetting. There is a theory developed by Young and Lippmann that explains the behavior of the angle of the contact line between the solution and the surrounding fluid for relatively small electrical fields. However, for large fields, experiments show that there is critical field where the contact line angle becomes saturated, i.e., there is no modification on the angle with an increasing on the electrical field. What we are doing is developing a multiphysics theory to explain the droplet shape and this saturation angle. We are doing this through computational fluid dynamics coupled with electrodynamics equations.