Flow Resistance of Connected Tubes

In summary, the conversation discusses calculating the flow resistance of three connected tubes with different diameters and comparing their resistances. The method used for calculating the resistance of tube B is also questioned. Additionally, the conversation considers the pressure difference and magnitude when a water pump is applied to the tubes, assuming there is no turbulence. The question of how the lengths of the tubes' sections affect the pressure difference is also brought up, and the suggestion of using the Bernoulli equation is mentioned. Finally, the conversation clarifies that there is no viscosity and asks for an answer based on this information.
  • #1
emh01
13
0
i want to ask how flow resistance of connected tubes with different diameters is calculated.
as you see in the uploaded image we imagine that there are 3 tubes.
tube A is 2 meters long and cross section area is 2S.
tube B is also 2 meters long but first 1 meter has 2S surface area and last 1 meter has S surface area
tube C is 2 meters and has S surface area

now: how we calculate the flow resistance of tube B? do we calculate the first and last 1 meters each and add the results or different method? how we compare the resistances of 3 tubes

if connect a water pump to left of them and want to pass the same flow rate how much pressure we have to apply. what will be the compare of pressure magnitudes (3 tubes are already fully filled with liquid before pump)

add: we accept that there is no turbulance

thanks
 

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  • #2
If there is no viscosity, how does the lengths of the various sections affect the pressure difference? Have you tried Betnoulli?
 
  • #3
You are right, it has to be "There is no turbulance"
 
  • #4
Chestermiller said:
If there is no viscosity, how does the lengths of the various sections affect the pressure difference? Have you tried Betnoulli?

You are right, it has to be "There is no turbulance" can you answer according to this
 
  • #5
can anyone answer?
 

1. What is flow resistance?

Flow resistance is the force that opposes the flow of fluid through a conduit or tube. It is caused by the friction between the fluid and the walls of the tube, as well as any obstacles or changes in diameter along the path of flow.

2. How is flow resistance measured?

Flow resistance can be measured using a variety of methods, including pressure drop, flow rate, and velocity measurements. These measurements can then be used to calculate the resistance using mathematical equations or by comparing the results to known values for similar systems.

3. How are connected tubes affected by flow resistance?

When tubes are connected in series, the flow resistance of each individual tube adds up to create a total resistance for the entire system. This means that the more tubes that are connected, the greater the overall flow resistance will be.

4. What factors affect the flow resistance of connected tubes?

The flow resistance of connected tubes is affected by several factors, including the length and diameter of the tubes, the type of fluid being transported, and the roughness of the tube walls. Additionally, any changes in direction or obstructions in the flow path can also impact the resistance.

5. How can flow resistance of connected tubes be minimized?

There are several ways to minimize the flow resistance of connected tubes. One way is to use tubes with larger diameters, as this reduces the friction between the fluid and the walls. Additionally, using smoother materials and reducing any changes in direction or obstructions in the flow path can also help to decrease the overall resistance.

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