OtherRegimes_web - ENU 4134 Other Co-Current Flow Regimes...

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Unformatted text preview: ENU 4134 Other Co-Current Flow Regimes D. Schubring October 5, 2009 Empirical Analysis of Two-Phase Fluid Mechanics Schedule I Flow Regime Maps 1 I Annular Flow 1.5 I Bubbly Flow 0.75 I Other flow regimes (intermittent and horizontal) 0.75 I Counter-current two-phase flow 0.5 I Pressure drop models 2.5 Other Regimes I Vertical intermittent flow (slug and churn) I Horizontal flow stratified, wavy, wavy-annular, annular I Other geometries Vertical Slug Flow In slug flow, the flow is strongly time-dependent, but circumferential independence is mostly maintained. The IATE can, in principle, be extended into the slug flow regime with no fundamental changes. This appears likely as a future modeling direction. There are some concerns relating to heat transfer and CHF. The wall is sometimes covered by liquid (bubbly-like) and sometimes a very thin film (annular-like) that may move downward or stagnate. As well see, these two situations are dealt with very differently in the CHF correlations. Vertical Churn Flow In churn flow, the instantaneous circumferential independence of the flow is strongly broken. As a result, detailed physical models are more difficult to generate....
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This note was uploaded on 07/14/2011 for the course ENU 4133 taught by Professor Schubring during the Spring '11 term at University of Florida.

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OtherRegimes_web - ENU 4134 Other Co-Current Flow Regimes...

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