GOLDFARB, M. C.; http://lattes.cnpq.br/5245162152672354; GOLDFARB, Maurício Costa.
Resumen:
A great number of hydraulic models can be applied to represent the uniform
turbulent flow in channels. The equation of Manning, one of the more used by designers,
can cause a 30% error in the results, according to the manual in the 9 of WPCF (1972).
Like this, as the equation of Manning, several other methodologies don't represent the
effect in the way of the traverse section of the flow satisfactorily. In this work, it was made
a bibliographical survey on the importance of this effect, as well as a study of the
application of two methodologies that search to compute the form effect satisfactorily. The
model developed by Silva (1992), based on the basic equations of the uniform flow and
considering a distribution non uniform of the tension of shear in the wet perimeter, it was
applied in channels of circular section, and, in spite of having based purely in a procedure
analytic, it presented results of great importance, because the form parameters used by
Silva (1992), came with behavior similar to the used by Kazemipour and Apelt (1980).
The methodology developed by Kazemipour and Apelt (1980), starting from
considerations of the dimensional analysis, it was adjusted in way to become completely
equacionável without the need of graphic resources. The method of Kazemipour was
shown quite efficient for the calculation of free uniform flow in flat channels of circular
geometry. The geometric parameters (P, D, yD) used by these researchers they were shown
enough to represent the form of the geometry of the traverse section in the calculation
procedures. A comparison between these these models through the analysis of the form
parameters used to represent the geometry of the section proven the likeness of the form
parameters used in the two methodologies. Finally is presented a calculation procedure
using the "method of Kazemipour" adjusted analytically.