Are there any experimental techniques available to measure entropy generation?

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Aurélien Arntz

Entropy change is a function of two variables chosen between density, temperature, and pressure, static or stagnation.

If you can measure two of the three you can compute the change in entropy.

Shufeng Zhang

Entropy: A concept that is not a physical quantity

https://www.researchgate.net/publication/230554936_Entropy_A_concept_that_is_not_a_physical_quantity

Mohsen Darabi

Yes

Abhilash Kumar Tilak

Dear Mohsen, please add some reference.