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Flow regime boundaries for an interior subchannel of a horizontal 37‐element bundle
Author(s) -
Aly A. M. M.
Publication year - 1981
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450590205
Subject(s) - bundle , flow (mathematics) , mechanics , mass flux , adiabatic process , isothermal flow , stratified flow , laminar flow , flow conditions , hele shaw flow , mass flow , flux (metallurgy) , materials science , open channel flow , geometry , geology , physics , mathematics , thermodynamics , turbulence , composite material , metallurgy
Abstract A needle contact probe system has been constructed and used to determine flow regime transitions for an interior subchannel in the upper half of a 37‐element horizontal bundle (to include the effect of gravity separation) for adiabatic air‐water flow. For the experimental range considered (up to ˜15.5 K * s −1 , 50% quality), five distinct flow regimes were identified. Using the equivalent hydraulic diameter concept and cross‐sectional average superficial velocities, air quality and total mass flux, flow regime maps were constructed. These maps are shown to deviate from pipe flow regime maps. The stratified smooth flow regime was never observed at the lowest flow rate considered due to the periodical disturbance of the flow by the bundle end plates and mid‐plane spacers.