Effect of external magnetic field on ultrasonic propagation velocity in magnetic fluids

Masaaki Motozawa, Yoshiyuki Matsumoto, Tatsuo Sawada

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Experimental results for the properties of ultrasonic propagation velocity in kerosene-based and water-based magnetic fluids are reported. Ultrasonic wave frequencies of 1 MHz, 2 MHz and 4 MHz are used and the measurement scheme is based on the pulse method. The external magnetic field intensity is varied from 0 mT to 550 mT and the angle between the magnetic field direction and the direction of ultrasonic wave propagation is varied from 0° to 90°. The ultrasonic propagation velocity in magnetic fluids is dependent on temperature, elapsed time of applying the magnetic field, and magnetic field intensity. Hysteresis and anisotropy of ultrasonic propagation velocity are observed. These interesting results seem to be related to chain-like cluster formation in the magnetic fluids and the characteristic period of Brownian motion of the magnetic particles.

Original languageEnglish
Pages (from-to)471-477
Number of pages7
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Volume48
Issue number3
DOIs
Publication statusPublished - 2006 Feb 15

Keywords

  • Anisotropy
  • Chain-like cluster
  • Hysteresis
  • Magnetic fluid
  • Sound velocity
  • Ultrasonic propagation velocity

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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