Fluid Mechanics: Choosing a fuel line diameter for a required pressure drop

In summary: Reynolds number is important for calculating the pressure drop in pipe flow.Then you need to find out about it in your fluid mechanics book, or wherever this problem came from.
  • #1
NickH21
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0

Homework Statement

[/B]
DB12A289-8491-4A73-A393-066E40D79639.jpeg


Homework Equations

- The pressure drop equation. [/B]

The Attempt at a Solution


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  • #2
Hi NickH21,

Your thread title is too general. Please make sure that your thread title is descriptive of the actual problem so that the Homeowrk Helpers with the correct skill set can quickly spot your thread. This time I will change your title to read: 'Fluid Mechanics: Choosing a fuel line diameter for a required pressure drop'.

Can you type out your Relevant equation(s) and define the variables? There are several possible pressure drop equations.
Can you explain where the numbers come from in your attempt? There isn't an obvious correlation between them and the given values in the problem statement; is there more work you haven't shown?

Also, Please take a moment to read the thread, Guidelines for students and helpers, which you can find pinned at the top of each of the homework forums. It gives an overview of how to create an effective homework help request following the posting rules.
 
  • #3
P=32 x w x Vavg x L / D^2
 
  • #4
You seem to be assuming you have laminar flow, when the problem statement strongly hints that the flow is turbulent. Have you calculated a Reynolds number?
 
  • #5
Chestermiller said:
You seem to be assuming you have laminar flow, when the problem statement strongly hints that the flow is turbulent. Have you calculated a Reynolds number?
Yes. I’ve got my Reynolds number, but that’s where I’m confused at. I just don’t know where to go from there.
 
  • #6
Are you familiar with how to get the pressure drop in pipe flow using friction factor and Reynolds number?

Where did you get that value for the diameter from?
Do you really think that a flow velocity of 524 m/s is realistic?
 
  • #7
Chestermiller said:
Are you familiar with how to get the pressure drop in pipe flow using friction factor and Reynolds number?

Where did you get that value for the diameter from?
Do you really think that a flow velocity of 524 m/s is realistic?
I’m not to sure how to find the pressure drop with the friction factor. I’m not familiar with that equation.
 
  • #8
NickH21 said:
I’m not to sure how to find the pressure drop with the friction factor. I’m not familiar with that equation.
Then you need to find out about it in your fluid mechanics book, or wherever this problem came from.
 

1. What is fluid mechanics?

Fluid mechanics is the study of how fluids (liquids and gases) behave when they are in motion or at rest. This branch of physics involves the study of forces, pressure, and flow rates within a fluid.

2. What is a fuel line diameter?

A fuel line diameter refers to the size or width of a tube or pipe that is used to transport fuel from one point to another. It is an important factor to consider when designing a fuel system as it affects the flow rate and pressure drop of the fuel.

3. How do you choose the right fuel line diameter for a required pressure drop?

To choose the right fuel line diameter, you need to consider the flow rate required for your specific application and the available pressure drop. You can use a pressure drop calculator or consult with a fluid mechanics specialist to determine the appropriate diameter for your fuel line.

4. What factors affect the pressure drop in a fuel line?

The main factors that affect the pressure drop in a fuel line are the length of the line, the flow rate of the fuel, and the diameter of the line. Other factors include the type of fluid being transported, the temperature and viscosity of the fluid, and the roughness of the inner surface of the line.

5. Why is it important to choose the right fuel line diameter?

The right fuel line diameter is crucial for ensuring efficient fuel delivery and avoiding pressure drop problems. If the diameter is too small, it can lead to a higher pressure drop, reducing the flow rate and potentially causing engine performance issues. On the other hand, if the diameter is too large, it can lead to unnecessary costs and potentially cause issues with fuel pressure and flow. Therefore, choosing the right diameter is essential for optimal fuel system performance.

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