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Pitch‐to‐diameter effect on two‐phase flow across an in‐line tube bundle
Author(s) -
Dowlati Ramin,
Kawaji Masahiro,
Chan Albert M. C.
Publication year - 1990
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690360513
Subject(s) - dimensionless quantity , pressure drop , mechanics , mass fraction , bundle , porosity , adiabatic process , hydraulic diameter , thermodynamics , materials science , two phase flow , homogeneous , superficial velocity , freon , chemistry , flow (mathematics) , physics , composite material , reynolds number , turbulence
Void fraction and friction pressure drop measurements were made for an adiabatic, vertical two‐phase flow of air‐water across two horizontal, in‐line, 5 × 20 rod bundles, one with a pitch‐to‐diameter ratio, P/D , of 1.3, the other 1.75. For both bundles the average void fraction showed a strong mass velocity effect and values were significantly less than those predicted by a homogeneous flow model. All void fraction data were found to be well correlated, with no P/D effect, using the dimensionless gas velocity, j * g . The two‐phase friction multiplier data exhibited a strong effect of P/D and mass velocity, however, the data for both bundles could be well correlated with the Martinelli parameter for G > 200 kg/m 2 s. The correlations developed for void fraction and two‐phase friction multiplier were successfully tested in predicting the total pressure drop in boiling freon experiments.