Hydrodynamic entrance lengths of non‐newtonian laminar falling films

Abstract

Abstract The Carreau viscosity model of the shear deformation is used to determine the hydrodynamic entrance length for falling liquid films emerging from a flat slit and flowing in a laminar fashion along an inclined flat plate. The present work enables the entrance‐length problem to be treated in a general form by choosing different values of the two parameters in the model. It is found that a significant difference exists between predicted results based on the power law model and the Carreau model when the fluid is pseudoplastic and the flow is decelerating.