Notch triangular

For a triangular notch of angle 29, the Flow dQ through the thin element of cross-section (Figure 6.24) is given by ... 

Half angle of triangular notch or angle made by inclined manometer lube with horizontal ... 

Notched trough distributors (Fig. 14-69g) consist of parallel troughs with side V notches. This distributor obeys the triangular notch equation instead of the orifice equation, which makes the flow proportional to h25 [instead of h05 in Eq. (14-163)]. This high power renders the distributor highly sensitive to out-of-levelness and... 

Barr, James, Experiments upon the Flow of Water over Triangular Notches, Engineering, April 8 15, 1910. 

For weirs with triangular notches, notches not fully covered by liquid (2,67) ... 

Pa-s (1 to 150 cP) and surface tension over the range of 0.03 to 0.07 N/m (30 to 70 dyn/cm). His equation predicts about an 8 percent increase in flow for a liquid of 0.1-Pa-s (100-cP) viscosity compared with water at 0.001 Pa s (1 cP) and about a 1 percent increase for a liquid with one-half of the surface tension of water. For fluids of moderate viscosity, Ranga Raju and Asawa [Proc. Am. Soc. Civ. Eng., J. Hydraul. Div., 103 (HY 10), 1227-1231 (1977)] find that the effect of viscosity and surface tension on the discharge flow rate for rectangular and triangular-notch ((j) = 45°) weirs can be neglected when... 

Weir distributors are prone to out-of-levelness more than any other distributor because the flow rate through a triangular notch is proportional to the liquid head raised to the power of 2.5 (flow rate through an orifice is only proportional to the liquid head raised to the 0.5 power). With weir distributors, an out-of-levelness of 1 or 2 in is sufficient to cause severe maldistribution (237, 436). One case was reported (436) in which a distributor in a 40-ft tower was installed to a level tolerance of Vie in to avoid this problem. Adjustable leveling screws are often provided and should always be specified with this distributor to enable an in situ level adjustment. The problem is most severe at low liquid rates and tumed-down conditions. 

Figure 6.7 Unique outlet weir designs, (a) Adjustable (b) swept back (c) rectangular notch (cl) Intermittent triangular notch (e) continuous triangular notch. (Parts a, and c toe from Henry Z. Kister, excerpted by special permission from Chemical Engineering, September 8,1980 copyright by McGraw-Hill, Inc., New York, NY 10020.)...

A round lake of diameter d is fed by a river and drained by seepage. The flow rate of the river is equal to the rate of seepage and thus the water level in the lake is constant. Should the lake level rise, the water from the lake flows through a triangular notch in a retaining wall and into a flood plain. Normally the water level matches the bottom of the triangular notch. 

Water level in lake is normally at the bottom of the triangular notch in the dam. 

Suddenly the flow rate of the river increases to 1.5 times the normal rate. The extra water flows through the triangular notch at a rate determined by the height of the lake above the bottom of the notch,... 

The sternochondrai articulation is formed by the costal cartilage and the triangular notches of the sternum. Small synovial joints are present The apex of each notch faces medially, with an anteroposterior axis that allows freedom of motion along the coronal plane. Radiate ligaments support the joints. 

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