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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Печать: 0276-1459
ISSN Онлайн: 1943-6181

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Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v19.i3.10
pages 211-223

TWO-PHASE PRESSURE DROP AND VOID FRACTION DURING FLOW BOILING OF ISO-OCTANE

V.V. Wadekar
Retired Consultant
Keith M. Miller
KBR, Inc.; HTFS, Aspen Technology, Reading, UK
M. E. D. Urso
Department of Chemical Engineering, Imperial College of Science, Technology and Medicine, London, United Kingdom; HTFS, Aspen Technology, Reading, UK

Краткое описание

The article reports pressure drop data for iso-octane boiling in vertical upflow in a 8-m-long, 25.4-mm i.d. tube, heated by direct electrical heating. The trends of the measured pressure gradient are checked with respect to vapor quality, mass flux, and pressure. After confirming that these trends are systematic, the two-phase pressure drop data are examined in terms of their constituent parts, namely, acceleration, friction, and gravity components. Subsequently, the data dominated by the gravity component are used to back-calculate void fractions, and these are compared with various correlations, including the HTFS void fraction method. Some correlations performed better than others in predicting the void fraction data. It is observed that generally, the measured void fraction is lower than expected in the high vapor quality region, even when the quality approaches near-dryout value. To explain this behavior, a simple model is constructed to calculate void fraction as a function of local vapor quality in the postdryout region.


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