Flow rate/pressure in a venturi

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Discussion Overview

The discussion revolves around the relationship between flow rate and pressure difference in a Venturi tube. Participants explore the underlying principles of fluid dynamics, particularly focusing on the behavior of fluids in constricted sections and the implications of Bernoulli's principle.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant notes that as flow rate increases, the pressure difference between the non-constricted and constricted sections of the Venturi increases, seeking an explanation for this observation.
  • Another participant suggests considering Bernoulli's principle, which states that the sum of pressure energy and kinetic energy remains constant in a flowing fluid, assuming no change in potential energy.
  • Some participants express difficulty in finding clear explanations in existing resources, indicating a need for further clarification on the topic.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants are still seeking explanations and clarifications regarding the relationship between flow rate and pressure difference.

Contextual Notes

Participants reference Bernoulli's principle but do not fully resolve how it applies to the specific scenario of increasing flow rates and pressure differences in a Venturi tube. The discussion remains open to interpretation and further exploration.

GBA13
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Homework Statement


Hi Guys,

I have found that as flow rate increases the pressure difference in the sections of the venturi increases. Would someone please mind explaining in words why as I'm not sure.

Homework Equations

The Attempt at a Solution


Well I know that when the fluid gets to a constricted section the velocity increases and the pressure decreases but I'm not sure why the pressure difference between the non constricted section and the constricted section increases with increased flow rate.

Thanks very much
 
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GBA13 said:

Homework Statement


Hi Guys,

I have found that as flow rate increases the pressure difference in the sections of the venturi increases. Would someone please mind explaining in words why as I'm not sure.

Homework Equations

The Attempt at a Solution


Well I know that when the fluid gets to a constricted section the velocity increases and the pressure decreases but I'm not sure why the pressure difference between the non constricted section and the constricted section increases with increased flow rate.

Thanks very much
Think Bernoulli: p + ρv2 = constant if there is no change in potential energy
 

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