Flow Rate Calculation: Get Help Solving

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Discussion Overview

The discussion revolves around calculating the flow rate based on a parabolic velocity profile provided for a range of radii from 0 to 5 cm. Participants explore the necessary steps and equations to derive the flow rate from the given data, which includes specific velocity values at corresponding radii.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant seeks help in understanding how to calculate flow rate given the radii and a parabolic velocity profile.
  • Another participant requests clarification on the locations and values of the velocity data provided.
  • A participant shares specific velocity values corresponding to the radii, indicating a need for understanding the problem rather than exact numerical accuracy.
  • There is a suggestion to determine the equation of the parabola that fits the velocity data to facilitate flow rate calculation.
  • One participant proposes using the relationship Vz/Vm = 2(1 - r^2/R^2) and the formula Q = A*v, questioning how to initiate the calculation.
  • Another participant mentions the assumption of a parabolic profile due to laminar flow characteristics.
  • There is a discussion about integrating the velocity profile to find the total flow rate, with one participant confirming understanding of this approach.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the calculation process, with some proposing methods while others seek clarification. There is no consensus on a single approach to solve the problem, and multiple viewpoints on how to proceed remain evident.

Contextual Notes

Participants have not fully specified boundary conditions or the exact nature of the integration process, leaving some assumptions and steps unresolved.

sehrish shakir
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hello!
i was provided by the radii from 0 to 5 cm and a parabolic profile is also given .. in numeric form i was asked to calculate the flow rate how to understand it to solve further kindly help
...
 
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sehrish shakir said:
hello!
i was provided by the radii from 0 to 5 cm and a parabolic profile is also given .. in numeric form i was asked to calculate the flow rate how to understand it to solve further kindly help
...
Please provide more detail about the locations where the velocity is provided, and the velocity values.
 
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Thank you for kind response sir ,
it was a question in exam ... like
r=0,1,2,3,4,5
v=2,1.92,1.68,1.28,0.72,0
numerical values may be some digits different but i need to understand a problem .
now if diameter is 10cm then calculate the flow rate ?
 
Last edited:
You said that the profile is parabolic. Do you know how to determine the equation for the parabola that satisfies this data? If you knew the equation for the parabola of v vs r, would you know how to determine the volumertic flow rate?
 
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Likes   Reactions: sehrish shakir
Vz\Vm=2(1-r^2/R^2)
this is the relation
Q=A*v
but how to initiate ?
should i specified the boundary condition then integerate or can do some numerical analysis to evaluate integeral or find out the mean value of velocity then proceed ...
 
i assumed it is parabolic as laminar has parabolic profile ..flow was laminar
 
sehrish shakir said:
Vz\Vm=2(1-r^2/R^2)
this is the relation
Q=A*v
but how to initiate ?
No.
$$Q=\int_0^R{v_z(2\pi r)dr}$$
Does this make sense?
 
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Chestermiller said:
No.
$$Q=\int_0^R{v_z(2\pi r)dr}$$
Does this make sense?
thank you for reply sir,
yes i got it, it is the total flow rate through duct .
 

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