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Experimental Studies of Pressure Drop and Flow Instability in Evaporative Micro-Channels

[+] Author Affiliations
Hee Joon Lee, Shi-Chune Yao

Carnegie Mellon University, Pittsburgh, PA

Dongyao Liu

Nanjing University of Science and Technology, JiangSu, China

Paper No. FEDSM2008-55166, pp. 605-612; 8 pages
doi:10.1115/FEDSM2008-55166
From:
  • ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
  • Volume 2: Fora
  • Jacksonville, Florida, USA, August 10–14, 2008
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4841-8 | eISBN: 0-7918-3832-3
  • Copyright © 2008 by ASME

abstract

Experiments were conducted on evaporative micro-channel systems of water, containing 48 parallel channels of 353 μm hydraulic diameter. The general correlation of two-phase pressure drop for an initial design purpose of evaporative micro-channel systems reported in [1] has been validated. For the water boiling in micro-channels, flow instability was observed. The instability criterion, proposed by Kandlikar [2], is able to predict the water experimental results. However, further examination of his criterion revealed that it can not predict the results of Brutin and Tadrist’s data of n-pentane. This is because the Bond number of water is 0.01, but 0.33 for n-pentane. As a result, the growing bubble of n-pentane may not cover the whole length of the micro-channel. A general expression of the effective length of squeezed bubbles in micro-channel was established for fluids at a wide range of Bond number. Using this proposed effective length, the Brutin and Tadrist’s experimental instability data can also be predicted satisfactorily.

Copyright © 2008 by ASME

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