Notation in fluid dynamics: A circle with a horizontal bar inside

Leo Liu · Oct 29, 2021

Typeset equations: C = P/(RT) = (P/P^Θ)/(T/T^Θ) C^Θ and ρ = MP/(RT) = (M/M^Θ · P/P^Θ)/(T/T^Θ) ρ^Θ, with 'However, measurements outside the design point must compensate for relate actual values to design values' above.

I came across this notation when reading the wiki article on Venturi effect, which baffled me. Can someone please tell me its meaning?

phystro · Oct 29, 2021

It is actually explained in a confusing way. The act of pressure measurement itself is interfering with the actual values of temperature T, pressure P, molar mass Μ, density ρ and concentration C of the liquid. Hence these physical quantities around the pressure-based meter have different values which are denoted with this "funny" notation.

haruspex · Oct 29, 2021

I assume the article is https://en.m.wikipedia.org/wiki/Venturi_effect.
Se if this article oriented more towards engineers helps:
https://instrumentationtools.com/pressure-temperature-compensation/

Notation in fluid dynamics: A circle with a horizontal bar inside

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