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Film instabilities in two‐phase flows
Author(s) -
Ostrach Simon,
Koestel Alfred
Publication year - 1965
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.690110221
Subject(s) - breakup , instability , mechanics , flow (mathematics) , amplitude , phase (matter) , rotation (mathematics) , two phase flow , stability (learning theory) , lead (geology) , physics , materials science , mathematics , computer science , geology , optics , geometry , quantum mechanics , geomorphology , machine learning
The major types of instabilities which can alter a given two‐phase flow pattern or lead to the breakup of a liquid film are delineated, and their physical mechanisms are discussed. Existing stability criteria are correlated to these basic types, and their application and limitations with respect to actual problems are indicated. Basic areas requiring further study are outlined. A criterion for determining the breakup length of a liquid film is developed which gives an indication of whether a given instability will lead to low frequency and high amplitude pressure and inventory pulsations. Such phenomena may be undesirable. Two new aspects of importance to the problem of film instability are introduced which have not been previously studied. These are rotation of the fluids and large disturbances in the flow. Their possible influence on the problem is discussed.