Basic Study on an Energy Conversion System Using Boiling Two-Phase Flows of Temperature-Sensitive Magnetic Fluid (Theoretical Analysis Based on Thermal Nonequilibrium Model and Flow Visualization using Ultrasonic Echo)

Jun Ishimoto, Masaaki Okubo, Shinichi Kamiyama

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Effects of magnetic field on the characteristics of boiling two-phase pipe flow of temperature-sensitive magnetic fluid are clarified in detail both theoretically and experimentally. Firstly, governing equations of two-phase magnetic fluid flow based on the thermal nonequilibrium two-fluid model are presented and numerically solved considering evaporation and condensation between gas- and liquid-phases. Next, behaviour of vapor bubbles is visualized with ultrasonic echo in the region of nonuniform magnetic field. This is recorded and processed with an image processor. As a result, the distributions of void fraction in the two-phase flow are obtained. Furthermore, detailed characteristics of the two-phase magnetic fluid flow are investigated using a small test loop of the new energy conversion system. From the numerical and experimental results, it is known that the precise control of the boiling two-phase flow and bubble generation is possible by using the nonuniform magnetic field effectively. These fundamental studies on the characteristics of two-phase magnetic fluid flow will contribute to the development of the new energy conversion system using a gas-liquid boiling two-phase flow of magnetic fluid.

Original languageEnglish
Pages (from-to)157-165
Number of pages9
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume61
Issue number581
DOIs
Publication statusPublished - 1995

Keywords

  • Boiling
  • Bubble
  • Energy Conversion
  • Flow Visualization
  • Laser
  • Magnetic Fluid
  • Multi-phase Flow
  • Non-equilibrium Flow
  • Supersonic Wave
  • Void Fraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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