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The Dynamic Characteristics of a Liquid-Gas Interface in Microscale Pores

[+] Author Affiliations
Junwoo Suh, Yuelei Yang, Frank M. Gerner, H. Thurman Henderson

University of Cincinnati, Cincinnati, OH

Paper No. IMECE2003-41862, pp. 247-253; 7 pages
doi:10.1115/IMECE2003-41862
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

This paper focuses on the experimental investigation of the dynamic characteristic of a liquid-gas (or vapor) interface, which occurs in very small diameter pores. For both Loop Heat Pipes, being developed as a thermal control device for microelectronics in space applications, and the de-watering process in a vibro-separator, the dynamic characteristics of a liquid-gas interface inside micropores greatly affects the efficiency of the entire system. In the pharmaceutical industries, product particles are discharged in the form of a dilute slurry from a reactor to a de-watering device, such as a vibro-separator. For extremely small pores, gravity is insufficient for removing the excess water through the micro porous screen. For these cases, it has been suggested that the de-watering process can be initiated by utilizing a vacuum pressure beneath the screen and applying a sinusoidal vibration to the screen. To understand the phenomena of de-watering from the product screen of a vibro-separator utilizing vibration and pressure, a single liquid-filled micropore is studied. In past studies [1], the Navier-Stokes and Young-Laplace equations have been used to describe the dynamic motion of the liquid column and liquid-gas interface. In this research, comparison is made between the amplitude and frequency of acceleration required to cause the bubble burst through predicted theoretically and measured experimentally.

Copyright © 2003 by ASME

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