Two-phase pressure drop across restrictions and other abrupt area changes
As part of continuing study of steady state and transient two-phase pressure drop across abrupt area changes, steady state pressure losses across restrictions of varying geometries were determined using Freon and Freon vapor. The results obtained are consistent with one-dimensional momentum balance theory which indicates that the prediction equation to be used depends upon whether or not the vena contracta lies within the insert. Each of these equations requires a knowledge of the void fraction at the inlet, outlet, and vena contracta. It was found that, for very short inserts (Ratio of restriction length, L, to diameter, D, less than 0.5) pressure drops were best predicted assuming slip flow at inlet and outlet and that the void fraction at the vena contracta was at or near the homogeneous value. For intermediate length inserts, partial mixing at the vena contracta must be assumed. (GRA)
- Research Organization:
- Cincinnati Univ., Ohio (USA). Dept. of Chemical and Nuclear Engineering
- DOE Contract Number:
- AT(49-24)-0179
- OSTI ID:
- 7341670
- Report Number(s):
- PB-251915; TRN: 77-003147
- Country of Publication:
- United States
- Language:
- English
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