School of Mechanical Engineering Nagler Jacob

School of Mechanical Engineering Seminar

School of Mechanical Engineering Seminar
Monday, October 30, 2017 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

Electro-rheological effect of nano spherical particles

Jacob Nagler

Aerospace M. E. (2013) - Technion.

Phd candidate (TAU) 

Under the supervision of

Prof. Touvia Miloh

A theoretical study is provided for determining the effective stress and viscosity of ideally conducting polarized freely spherical solid particles suspended in a Stokes dilute suspension (symmetric electrolyte) under ambient DC electric field and far shear field, by developing linear model that neglects particle-particle interactions. The parts of this work shall be specified as follows. Firstly, we discuss the cell model of suspension without the electrical field effect but under far shear field such as the well-known classical Einstein formulations of the apparent viscosity and stress have been obtained following the procedure of Miloh-Benveniste (1989). The second part deals with the electrical field effect following the procedure of Yariv-Miloh (2008). The electrical field causes to electric double layer (EDL) formation (also known as 'Stern layer') around the spherical particle surface while interaction between the EDL and the hydrodynamic fluid takes part, simultaneously. Finally, Helmholtz – Smolochowski (H-S) model results for thin EDL entirely agrees with current results and obtained analytically by using the generalize cell model method.