Flow characteristics of magnetic functional fluids under unsteady magnetic fields

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05806
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Keio University
• Principal Investigator: Sawada Tatsuo 慶應義塾大学, 理工学部(矢上), 教授 (00162545)
• Project Period (FY): 2015-10-21 – 2018-03-31
• Keywords: 磁性流体 / MR流体 / 超音波 / 磁場 / クラスター

Outline of Final Research Achievements

Magnetic fluids (MF) and magnetorheological fluids (MRF) are stable colloidal dispersion of small magnetic particles in a liquid carrier. When an external magnetic field is applied to an MF or MRF, some of the inner particles coagulate and form a clustering structure. In the present study,the following experiments were carried out: (1) Ultrasonic propagation velocity was measured and the change of ultrasonic propagation velocity was calculated. Based on the experiment results, the relation between the change of ultrasonic propagation velocity and magnetic field strength and frequency of AC magnetic field were discussed. (2) used Bingham plastic model was used to represent the dynamic behavior of MR fluid flow in a circular pipe under a magnetic field theoretically. The author carried out the flow experiment of MR fluid at a constant flow rate and compared
experimental results and analytical results quantitatively.

Free Research Field

流体工学