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The laminar‐turbulent transition in nonisothermal flow of pseudoplastic fluids in tubes
Author(s) -
Hanks Richard W.,
Christiansen E. B.
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.690080409
Subject(s) - shear thinning , laminar flow , turbulence , bingham plastic , rheology , mechanics , thermodynamics , flow (mathematics) , materials science , chemistry , physics
Ryan and Johnson's treatment of the transition from laminar to turbulent flow is extended to include the heated flow of pseudoplastic liquids in smooth tubes. A limitation is pointed out for the case of Bingham plastic fluids. The theoretical results of the present investigation are compared with experimental data obtained for a large number of pseudoplastic fluids having widely variant rheological properties. It is found that the theoretically predicted flow rates corresponding to the inception of turbulence agree with the observed values to within ±6.7%. The theoretical critical wall shear stresses agree within ±3.87% with experiment.