On the compressibility factor as a similarity parameter for steady single-phase isentropic expansions of organic vapors

Marta Zocca

doi:10.1016/j.applthermaleng.2026.132672

On the compressibility factor as a similarity parameter for steady single-phase isentropic expansions of organic vapors

2026-08-11

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M

Marta Zocca *

M

Marta Pederzolli

T

Teemu Turunen-Saaresti

A

Alberto Guardone

DOI：10.1016/j.applthermaleng.2026.132672

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Abstract

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• Revisits similarity using Zt plus thermodynamic origin of expansion. • Explains why the value of Zt alone is insufficient as similarity parameter. • Includes geometry-independent analysis of expansions across fluids and states. • Provides practical insights to plan nonideal expansion tests and compare results. • P/Pt profiles collapse within 1% for Zt≳0.6 in quasi-ideal region.

Keywords:

Similarity parameters

Isentropic flows

Supersonic flows

Organic fluids

Nonideal Compressible Fluid Dynamics (NICFD)

Organic Rankine Cycle (ORC)

On the compressibility factor as a similarity parameter for steady single-phase isentropic expansions of organic vapors

Abstract

Journal

Organization

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