Makio Iwabuchi

Effect of a magnetic field on the performance of an energy conversion system using magnetic fluid

A magnetic fluids thermo-hydrodynamic characteristics in an energy conversion system with parallel ducts depend strongly on the systems type of magnetic field distribution. These characteristics are estimated by the numerical analysis taking into account the internal angular momentum of particles in the magnetic fluid qualitatively.

RHEOLOGY OF ERF ON VARIOUS FLOW FIELDS

This paper is concerned with the experimental investigation of electrorheological effect (ER effect) on apparent viscosity and yield stress obtained from hydrodynamic characteristics of electrorheological fluid (ERF) in various flow fields. Our conducting flow fields are made by using rectangular duct, concentric cylindrical pipe, rotating disk and rotating concentric cylinder. The measured parameters of the former two cases are pressure difference at a given volumetric flow rate, and the latters are torque at a given angular velocity. Our using ERF is suspension type. We arrange these data to obtain increment of apparent viscosity and yield stress with and without a supplying D.C. electric field by using integral method of rheology. It is clarified that qualitative values of increment of apparent viscosity and yield stress are different at each flow field. In addition, the quantitative ER effects of shear rate and electric field strength on the increment of apparent viscosity and yield stress are clarified.