A Venturi tube will be used to measure the flow speed in a river. The instrument is shown in the figure. V1, Patm V2, P2 The Venturi tube has a limit of operation. This limit regards to the fact that pressure p2 cannot drop too much below the atmospheric pressure because the water will boil. With a normal temperature (i.e. 20 °C), the water will evaporate with a pressure below 20340 [Pa] (while the atmospheric pressure is Patm 101000 Pa or 1010 hPa). Determine the maximum velocity v₁ which can be measure by a Venturi tube in which A₁/A2=2 (i.e. ratio of area at the entrance over the constriction). Help: Specify the atmospheric pressure as an absolute pressure of Patm-101000 Pa (i.e. do not use Patm=0) Note: The evaporation of water inside pipes with fast flows is a recurrent problem in hydraulics. This phenomenon is called cavitation.

A Venturi tube will be used to measure the flow speed in a river. The instrument is shown in the figure. V1, Patm V2, P2 The Venturi tube has a limit of operation. This limit regards to the fact that pressure p2 cannot drop too much below the atmospheric pressure because the water will boil. With a normal temperature (i.e. 20 °C), the water will evaporate with a pressure below 20340 [Pa] (while the atmospheric pressure is Patm 101000 Pa or 1010 hPa). Determine the maximum velocity v₁ which can be measure by a Venturi tube in which A₁/A2=2 (i.e. ratio of area at the entrance over the constriction). Help: Specify the atmospheric pressure as an absolute pressure of Patm-101000 Pa (i.e. do not use Patm=0) Note: The evaporation of water inside pipes with fast flows is a recurrent problem in hydraulics. This phenomenon is called cavitation.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?

Question

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A Venturi tube will be used to measure the flow speed in a river. The instrument is shown in the figure.
V1, Patm
V2, P2
The Venturi tube has a limit of operation. This limit regards to the fact that pressure p2 cannot drop too
much below the atmospheric pressure because the water will boil. With a normal temperature (i.e. 20
°C), the water will evaporate with a pressure below 20340 [Pa] (while the atmospheric pressure is
Patm 101000 Pa or 1010 hPa).
Determine the maximum velocity v₁ which can be measure by a Venturi tube in which A1/A2=2 (i.e. ratio
of area at the entrance over the constriction).
Help: Specify the atmospheric pressure as an absolute pressure of Patm-101000 Pa (i.e. do not use
Patm=0)
Note: The evaporation of water inside pipes with fast flows is a recurrent problem in hydraulics. This
phenomenon is called cavitation.

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