99. .. IP A Siphon for Irrigation A siphon is a device that allows water to flow

Question

99. .. IP A Siphon for Irrigation A siphon is a device that allows water to flow from one level to another. The siphon shown in Figure 15-37 delivers water from an irrigation canal to a field of crops. To operate the siphon, water is first drawn through the length of the tube. After the flow id started in this way it contin ues on its own. a) Using points 1 and 3 n Figure 15-37, find the speed v of the water leaving the siphon at it's lower end. Give a symbolic answer. (b) Is the speed of the water at point 2 greater than, less than, or the same as its speed at point 3? Explain

Explanation / Answer

part a )

by bernouilli equation

P1 + 0 + 0 = P2 + 1/2*qv2^2 + qgh = P3 + 1/2qv3^2 - qgd

pressure at P1 and P3 should be atmoshperic

v = sqrt (2gd )

part b )

area is same through out

by equation of continouty

A1V2 = A2V2

A2V2 = A3V3

since A2 = A3

V2 = V3 speed is same

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