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A proposed mechanism for hydrodynamically-controlled onset of significant void in microtubes

✍ Scribed by R.C Chedester; S.M Ghiaasiaan

Book ID: 104289449
Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 224 KB
Volume: 23
Category: Article
ISSN: 0142-727X
DOI: 10.1016/s0142-727x(02)00199-6

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✦ Synopsis

Data and analysis have shown that bubble nucleation and ebullition phenomena in microchannels are different than in large channels. The macroscale models and correlations often fail to predict data representing bubble ebullition processes in microchannels. It is hypothesized here that hydrodynamically-controlled onset of significant void in microchannels is due to bubble departure from wall cavities, and the latter process may be controlled by thermocapillary and aerodynamic forces that act on the bubble. Accordingly, the limited available relevant experimental data are semi-analytically modeled, and the soundness of the proposed hypothesis is shown.

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