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Critical dynamics of an isothermal compressible nonideal fluid


, : Critical dynamics of an isothermal compressible nonideal fluid. Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics 86(6 Pt 1): 061119-061119

A pure fluid at its critical point shows a dramatic slow-down in its dynamics, due to a divergence of the order-parameter susceptibility and the coefficient of heat transport. Under isothermal conditions, however, sound waves provide the only possible relaxation mechanism for order-parameter fluctuations. Here we study the critical dynamics of an isothermal, compressible nonideal fluid via scaling arguments and computer simulations of the corresponding fluctuating hydrodynamics equations. We show that, below a critical dimension of 4, the order-parameter dynamics of an isothermal fluid effectively reduces to "model A," characterized by overdamped sound waves and a divergent bulk viscosity. In contrast, the shear viscosity remains finite above two dimensions. Possible applications of the model are discussed.

US$19.90

PMID: 23367905

DOI: 10.1103/PhysRevE.86.061119


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