What Factors Influence the Development of Static Pressure in Fluids?

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Discussion Overview

The discussion revolves around the factors influencing the development of static pressure in fluids, exploring definitions, distinctions between types of pressure, and the implications of these distinctions in fluid mechanics, particularly in the context of Bernoulli's principle.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • Some participants define static pressure as the pressure of a fluid at rest, while others suggest it is related to frictional forces within the fluid.
  • One participant argues that static pressure is typically due to the fluid being constricted in a container.
  • There is contention regarding the terminology of static and dynamic pressure, with some expressing frustration that these terms imply different kinds of pressure exist.
  • Another viewpoint suggests that static pressure is the only "real pressure" that can be felt, while dynamic pressure is described as kinetic energy per unit volume.
  • Participants discuss the necessity of distinguishing between static and dynamic pressures in Bernoulli's principle to avoid misconceptions about pressure behavior in moving fluids.
  • Some argue that the separation of pressure types is confusing and unnecessary, while others believe it is essential for understanding fluid dynamics.
  • There is a mention of how pressure measurements can vary based on the orientation of pressure probes and the flow conditions, highlighting the complexity of measuring pressures accurately.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and clarity of distinguishing between static and dynamic pressures. No consensus is reached on whether these distinctions are helpful or merely a source of confusion.

Contextual Notes

Limitations in understanding arise from varying interpretations of pressure types and their implications in fluid mechanics, particularly in educational contexts. The discussion reflects a range of experiences and backgrounds in fluid dynamics, which may influence perspectives on terminology and concepts.

  • #31
boneh3ad said:
Right, so he was asking what he would call the two terms on the right hand side that add up to stagnation pressure. You only quoted the one term, and the term you quoted was the dynamic pressure term.
Missed an edit, my previous post is correct now. The point was that dynamic, impact, or stagnation pressure can refer to either compressible or incompressible flow.
 
Last edited:
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  • #32
rcgldr said:
My point was that stagnation pressure can refer to either compressible or incompressible flow.

Well, yes, and it is defined the same way in each case: the static pressure when the flow is isentropically brought to zero velocity. You just have to be careful how you measure it, as doing so with a Pitot probe introduces a shock into the flow, which is not isentropic, and you must incorporate the shock into the calculation. It is still fairly easy to do, though.
 

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