Papers by Keyword: Apparent Gravity Effect

Abstract: A ferro-hydrodynamic ( FHD ) model, based on modified Bernoulli theory, to estimate the average ferro-flow velocity is developed in this study. In which, the effective viscosity, strongly dependent on the magnetic intensity and volumetric concentration of ferro-particle, is considered. Referred to the Langevin function, the induced magnetic pressure together with hydraulic head as well as frictional head successfully formulates the modified ferro-Bernoulli model .To correct the analytic results, a self-designed experimental mechanism, equipped with light gate and current-carry solenoid, is set up as well ,which is used to measure the average velocity of piping flow via the duration recorded for ferro-fluid passing through both light gates While compared with experimental results, a good agreement of analytic solutions will be delivered within the working magnetic intensity ,0~36 mT, and the flow velocity is found to be significantly reduced during initial magnetization 0~12 mT as the working condition, subjected to ferro-concentration 0.04~0.4 at temperature 25 oc~45 oc, is specified in this study.

Abstract: Due to the reversible transformation of physical property is strongly induced for ferro-fluid, so called intelligent working medium, subjected to the magnetic flux, its effective viscosity, especially, is closely dependent on the magnetization of ferro-particle and shows a special advantage in reducing the damping effect without magnetization hysteresis. Therefore magnetized fluid as a new engineering material, used for the shock absorber of building structure, has gradually attract scientist’s interest and engineer’s attention. Instead of previous experimental measuring the magnetized degree of ferro-fluid by costly Vibration Sample Magnetometer (VSM), a designed testing mechanism, based on modified Langevin function in apparent weight loss to characterize the magnetic behavior, is introduced in this study. It not only features as an stable, economical and affordable utility for local researchers, but a safe, easy operation with fast data acquisition would be also accessed. While compared with the experimental result conducted by VSM for ferro-sample provided by Matsumoto Co., the significant deviation using classic Langevin function in saturated magnetization M_d ,within the magnetic field, 0 ~ 6 mT, can be effectively lessened to 50 % as the calculation undergone by modified model proposed.