Redes Flujo
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MANUAL DE LABORATORIO DE MECÁNICA DE SUELOS UNIVERSIDAD NACIONAL DEL ALTIPLANO ESCUELA PROFESIONAL DE INGENIERÍA AGRÍCOLA Pág. 1 Ing. Roberto Alfaro Alejo CONSTRUCCION DE REDES DE FLUJO Y FILTRACION 10.1 Definiciones Flow net a graphical representation of the 2 - D flow of water through soils Flow line the flow path of a particle of water Equipotential line - a line representing constant head 10.2 Flow Net Facts The area between two flow lines is called a flow channel. The rate of flow in a flow channel is constant. The velocity of flow is normal to equipotential lines. The difference in head between two equipotential lines is called the potential drop or head loss. 10.3 Dibujando Redes de Flujo Identify prefixed conditions, noting starting directions of lines. Draw trial family of flow lines (or equipotentials) consistent with prefixed conditions. Keeping the lines you just drew, sketch first trial flow net. Make all lines intersect other set of lines at 90 degrees. Erase and redraw lines until all figures are square. Subdivide as desired for detail and accuracy. 10.4 Rules for Sketching Flow Nets Flow lines must intersect equipotential lines at right angles. The area between flow lines and equipotential lines must be curvilinear squares. An inscribed circle should be able to be drawn that touches each side of the square. Figure 10.1: Budhu, 2000.
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Transcript of Redes Flujo
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MANUAL DE LABORATORIO DE
MECNICA DE SUELOS
UNIVERSIDAD NACIONAL DEL ALTIPLANO
ESCUELA PROFESIONAL DE INGENIERA AGRCOLA
Pg. 1 Ing. Roberto Alfaro Alejo
CONSTRUCCION DE REDES DE FLUJO Y FILTRACION
10.1 Definiciones Flow net a graphical representation of the 2 D flow of water through soils Flow line the flow path of a particle of water Equipotential line a line representing constant head
10.2 Flow Net Facts The area between two flow lines is called a flow channel. The rate of flow in a flow channel is constant. The velocity of flow is normal to equipotential lines. The difference in head between two equipotential lines is called the potential drop or
head loss.
10.3 Dibujando Redes de Flujo Identify prefixed conditions, noting starting directions of lines. Draw trial family of flow lines (or equipotentials) consistent with prefixed conditions. Keeping the lines you just drew, sketch first trial flow net. Make all lines intersect other
set of lines at 90 degrees. Erase and redraw lines until all figures are square. Subdivide as desired for detail and
accuracy.
10.4 Rules for Sketching Flow Nets Flow lines must intersect equipotential lines at right angles. The area between flow lines and equipotential lines must be curvilinear squares. An
inscribed circle should be able to be drawn that touches each side of the square.
Figure 10.1: Budhu, 2000.
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MANUAL DE LABORATORIO DE
MECNICA DE SUELOS
UNIVERSIDAD NACIONAL DEL ALTIPLANO
ESCUELA PROFESIONAL DE INGENIERA AGRCOLA
Pg. 2 Ing. Roberto Alfaro Alejo
Figure 10.2: Cedergren, 1989.
Figure 10.3: Cedergren, 1989.
Flow lines cannot intersect other flow lines. Equipotential lines cannot intersect other equipotential lines.
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MANUAL DE LABORATORIO DE
MECNICA DE SUELOS
UNIVERSIDAD NACIONAL DEL ALTIPLANO
ESCUELA PROFESIONAL DE INGENIERA AGRCOLA
Pg. 3 Ing. Roberto Alfaro Alejo
The more flow lines and equipotential lines drawn, the more accurate your results. However, the more lines, the more difficult it will be to draw the flow net. Drawing a few will allow you to obtain a suitable solution.
10.5 Common Mistakes
10.6 Example
10.7 Example Problem
Figure 10.4: Cedergren, 1989.
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MANUAL DE LABORATORIO DE
MECNICA DE SUELOS
UNIVERSIDAD NACIONAL DEL ALTIPLANO
ESCUELA PROFESIONAL DE INGENIERA AGRCOLA
Pg. 4 Ing. Roberto Alfaro Alejo
Figure 10.5: Budhu, 2000
