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Skin friction patterns for transitional flow in annuli
Author(s) -
Croop E. J.,
Rothfus R. R.
Publication year - 1962
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.690080109
Subject(s) - mechanics , reynolds number , friction factor , pressure drop , concentric , flow (mathematics) , isothermal process , position (finance) , materials science , range (aeronautics) , mathematics , thermodynamics , geometry , physics , turbulence , composite material , finance , economics
Main stream velocity profiles have been obtained by means of impact probes for the steady, isothermal flow of water in three smooth, concentric annuli having widely different diameter ratios. The point of maximum local velocity has been determined, thus permitting the ratio of skin frictions at the inner and outer boundaries to be calculated. Previously published data on pressure drop have been used to obtain separate friction factor correlations for the two surfaces. Attention has been centered on the transition range, where the position of maximum velocity is a function of both the diameter ratio and the Reynolds number.