T2 Fluid dynamics exercises

T2 Fluid dynamics

by Liliana BC

​Fluid dynamics

​Fluid dynamics is "the branch of applied science that is concerned with the movement of liquids and gases"

​There are 3 main ways in which fluids can move

​

• ​Laminar

• ​Turbulent

• ​Transitional

​Reynold's number is the measurement we consider to evaluate the type of flow ..

Multiple Choice

What kind of flow shows a line pattern when the fluid moves?

• Turbulent

• Laminar

• Both

• None of them

Multiple Choice

A high Reynold's number means laminar flow

• True

• False

Multiple Choice

This is the unit to measure Pressure

• Newton

• Pascal

• cubic meter

• square meter

Multiple Choice

A Pascal is equal to a

• $$\frac{kg}{m^3}$$  

• N m

• $$\frac{N}{m^2}$$  

• $$kg\ \frac{m}{s^2}$$  

Multiple Choice

Density is measured in

• Newtons

• Pascals

• $$\frac{kg}{m^3}$$  

• Cubic meters

Multiple Choice

Water flows through a circular tube which transverse section has a diameter of 0.3 m. What speed will the water have inside the tube if the flow is 1.20 m³/s?

• 17.14 m/s

• 1.2m³/s

• 17.14 m²/s 

• 0.07m²

Multiple Choice

Water runs through a plumbing with a flow of 0.750m³/s and arrives to every exit of a fountain. At what speed will the water come out of the holes if these have a diameter of 40mm? At what speed would the water come out if the diameter is 120 mm?

• 100 m/s at diameter of 40 mm

  23 m/s at diameter of 120 mm

• 66.3m/s at diameter of 40 mm

  600 m/s at diameter of 120 mm

• 200 m/s at diameter of 120 mm

  10 m/s at diameter of 40 mm

• 600 m/s at diameter of 40 mm

  66.3m/s at diameter of 120 mm

Multiple Choice

A large full water tank has a circular hole of 3 mm radius, positioned 10 m below the water level in the tank. On top, the tank is not covered. Calculate the speed at which the water will come out and the volume of water to be discharged per time unit.

• Velocity 14 m³/s

  Volume of water 4x10^-4 m/s

• Velocity 14 m/s

  Volume of water 4x10^-4 m³/s

• Velocity 10 m/s

  Volume of water 4 m³/s

• Velocity 14 m/s

  Volume of water 2.82x10^-5 m³/s

Open Ended

If the pipe of the previous exercise is connected to a hose and the speed there is 3.8 m/s, what is the diameter of the hose?

Open Ended

A certain oil with a density of 780 kg/m³ is flowing inside a pipe at a flow rate of 8l t/s and passes through a section of 8.0 cm in diameter, a) what is the speed at which the oil flows? b) If the oil passes through a second section of the pipe with a speed of 6.8 m/s. What is the radius?