Thermodynamic speed of sound in multiphase systems

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A procedure to evaluate the thermodynamic speed of sound in systems with any number of fluid phases is presented in this paper. Starting from the definition of speed of sound, the derivation of the procedure uses the conservation equations for volume, entropy, and number of moles of each component, the derivatives of several thermodynamic properties, and the solution of a system of linear equations. A computer algebra program was used to automatically derive and implement in computer the required expressions. The calculated thermodynamic speeds of sound reported in this paper are in very good agreement with results published recently, based on numerical derivatives, but show some discrepancies with earlier results available in the literature.

Original languageEnglish
Pages (from-to)204-211
Number of pages8
JournalFluid Phase Equilibria
Issue number2
Publication statusPublished - 25 Jul 2011



  • Bubble point
  • Dew point
  • Equations of state
  • Isentropic processes
  • Speed of sound

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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