Abstract
The objective of this thesis is to investigate the basic structure of alternating-current type Magneto-hydrodynamic (MHD) pumps. Driven by Lorenz Force based upon the interactions of magnetic and electric field, the pumps maintain alternating magnetic and electric field to suppress the electrolysis in electrolyte. A magneto-static field is generated inside a ring made of Halbach Array for providing a strong and uniform magnetic field inside the large air-gap. Then, rotating Halbach Array generates the alternating field inside the stationary air-gap. Two electrodes further provide the alternating electric field for synchronization of electric current to the alternating magnetic field. With a MHD pump made of plastics tube by 5 by 10 mm in width and height, this study has focused on the velocity of fluids made of various concentrations in NaCl solutions ranging from 0.15 M (biocompatible Saline) to 2 M. The verifications on the ac MHD pumps explore the feasibility of bio-medical applications for future lab-on-chips potential.