Investigating Orifice Problem: Pipe Head Differences & Theoretical Head

In summary, the conversation discussed the problem of finding the theoretical difference in head pressure before and after an orifice, as well as comparing it to the experimental difference in head pressure. The quantities given for the pipe before and after the orifice head were the diameter and time for 10 litres to fill in a collection tank. The equation used to calculate the theoretical difference in head pressure took into account the density, gravitational constant, and velocities of the fluid before and after the orifice. It was noted that the theoretical difference was lower than expected due to not accounting for local or frictional losses.
  • #1
matthew_hanco
19
0
Orifice problem I've been given a list of quantities

Pipe before orifice head = 255mm
Diameter = 31.75mm

Pipe after orifice head = 230mm
Diameter= 20mm

Time for 10litres to fill in collection tank 67.09seconds
Assuming g= 9.81 and density = 1000

from the experiment difference in pressure head = 25mm
They wanted to know the theorectical.

Calling everything before head 1 and after head 2

u1= Q/ A where Q= 0.149 x 10^-3 m^3/s and A = 0.791x10^-3 m^2

u1 = 0.188

u2= Q/ A where Q= 0.149 x 10^-3 m^3/s and A =0.314x 10^-3 m^2

u2= 0.475

putting into equaton

P1-P2/p x g = u2^2/2g - u1^2/2g where p=density

gives the difference in theoretical head = 9.7mm

Im not sure if that is right as its a third of the experiment, if it is right how can it be because surely the theory should be higher as you don't take into account the local or frictional losses.

Hope someone can help.
 
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  • #2
Diagram or complete staement of the problem?
 
  • #3
The problem was find the theoretical difference in head pressure before and after orifice. Then compare with experimental difference in head pressure. No diagram wasnt given one to begin with. sorry
 

FAQ: Investigating Orifice Problem: Pipe Head Differences & Theoretical Head

1. What is an orifice problem?

An orifice problem refers to a situation where there is a difference in pipe head, or the energy level of a fluid, between two points in a pipe system. This difference can be caused by various factors such as changes in pipe diameter, bends, or obstructions.

2. Why is it important to investigate orifice problems?

Investigating orifice problems is important because it can help identify potential issues in a pipe system, such as leaks or blockages, that can affect the performance and efficiency of the system. It can also help determine the best course of action for resolving these issues.

3. How is theoretical head related to orifice problems?

Theoretical head is a measure of the potential energy of a fluid in a pipe system, and it is directly related to orifice problems because a difference in pipe head can result in a change in theoretical head. This can cause variations in flow rate and pressure, which can impact the overall performance of the system.

4. What are the methods for investigating orifice problems?

There are several methods for investigating orifice problems, including visual inspection, flow rate and pressure measurements, and computer simulations. Visual inspection involves physically examining the pipe system for any visible issues, while flow rate and pressure measurements can provide data on the performance of the system. Computer simulations use mathematical models to predict the behavior of the system under different conditions.

5. How can orifice problems be resolved?

The resolution of orifice problems depends on the specific issue identified during the investigation. Some common solutions include repairing or replacing damaged pipes, removing obstructions, or adjusting the flow rate or pressure in the system. It is important to consult with experts and carefully consider all possible solutions before implementing a resolution to ensure the long-term effectiveness of the fix.

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