Problem 03 | Bernoulli's Energy Theorem

Tags: pressure head velocity head Bernoulli’s energy equation head loss

Problem 3

A 300-mm pipe is connected by a reducer to a 100-mm pipe. See Figure 4-02. Points 1 and 2 are at the same elevation, the pressure at 1 is 200 kPa.

The discharge Q is 30 liters per second flowing from 1 to 2 and the energy lost from 1 to 2 is equivalent to 20 kPa.

a. Compute the pressure at 2 if the liquid is water.

b. Compute the pressure at 2 if the liquid is oil (sp gr = 0.80).

c. Compute the pressure at 2 if the liquid is molasses (sp gr = 1.5).

Solution 3

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Discharge

Head loss

Velocity heads

Energy equation between 1 and 2

Submitted by Romel Verterra on December 16, 2012 - 3:10pm

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Part a: The liquid is water:

answer

Part b: The liquid is oil (sp gr = 0.80):

answer

Part 3: The liquid is molasses (s = 1.5):

answer

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