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Torque Transient of Magnetically Driven Flow for Viscosity Measurement

[+] Author Affiliations
Heng Ban, Bochuan Lin, Chao Li, Rosalia N. Scripa

University of Alabama at Birmingham, Birmingham, AL

Ching-Hua Su, Sandor L. Lehoczky

NASA/Marshall Space Flight Center, Huntsville, AL

Paper No. HT-FED2004-56715, pp. 509-513; 5 pages
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 1
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4690-3 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME


Viscosity is a good indicator of structural changes for complex liquids, such as semiconductor melts with chain or ring structures. This paper discusses the theoretical and experimental results of the transient torque technique for non-intrusive viscosity measurement. Such a technique is essential for the high temperature viscosity measurement of high pressure and toxic semiconductor melts. In this paper, our previous work on oscillating cup technique was expanded to the transient process of a magnetically driven melt flow in a damped oscillation system. Based on the analytical solution for the fluid flow and cup oscillation, a semi-empirical model was established to extract the fluid viscosity. The analytical and experimental results indicated that such a technique has the advantage of short measurement time and straight forward data analysis procedures.

Copyright © 2004 by ASME



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