Secondary Flow In Sine-generated Open Channel
Author(s)
M.F. Maghrebi
Abstract
Secondary flow in a sine-generated open
channel
M.F. Maghrebi
Civil Eng. Dept., Faculty ofEng., Ferdowsi Univ. ofMashhad, Iran
Abstract
Experimental works in a sinuous open channel were performed to identify the vortical
structures. Although the nature of such vortices are 3D and they mainly associated with
low-speed and low-pressure zones in channel, the hypotheses of 2D models for the
prediction of phase lag and bed topography seems to be satisfactory. In the theoretical part
of the present paper by the use of the dynamic equation in the lateral direction for a curved
open channel an equation for the velocity distribution in the lateral direction is extracted.
Then, assuming a sine-generated channel whose curvature is a function of its longitudinal
position, the phase lag between the secondary flow and the main flow is obtained. Next, by
the use of different assumptions for the flow characteristics, different phase-lag formulas
are extracted. Finally using the concept of incipient motion,
Keywords
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