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Crossover from singular critical to regular classical thermodynamic behavior of fluids

Physical Review A, ISSN: 1050-2947, Vol: 41, Issue: 6, Page: 3161-3177
1990
  • 184
    Citations
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  • 12
    Captures
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Metrics Details

  • Citations
    184
    • Citation Indexes
      184
  • Captures
    12

Article Description

A procedure is presented for constructing a thermodynamic free energy for fluids in the critical region that incorporates the crossover from Ising-like singular behavior near the critical point to regular classical behavior far away from the critical point. The procedure is based on an approximation of the solution of the renormalization-group theory of critical phenomena, modified to include effects from a cutoff wave number for the crossover to the classical limit. As an illustration we show how the procedure can be applied to a truncated classical Landau expansion. The results are compared with experimental thermodynamic-property data for carbon dioxide, steam, and ethylene in the critical region. © 1990 The American Physical Society.

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