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The conventional fluid description of multi-component plasma, supplemented byan appropriate equation of state for the macroparticle component, is used toevaluate the longitudinal sound velocity of Yukawa fluids. The obtained resultsare in very good agreement with those obtained earlier employing thequasi-localized charge approximation and molecular dynamics simulations in arather broad parameter regime. Thus, a simple yet accurate tool to estimate thesound velocity across coupling regimes is proposed, which can be particularlyhelpful in estimating the dust-acoustic velocity in strongly coupled dusty(complex) plasmas. It is shown that, within the present approach, the soundvelocity is completely determined by particle-particle correlations and theneutralizing medium (plasma), apart from providing screening of the Coulombinteraction, has no other effect on the sound propagation. The ratio of theactual sound velocity to its "ideal gas" (weak coupling) scale only weaklydepends on the coupling strength in the fluid regime, but exhibits a pronounceddecrease with the increase of the screening strength. The limitations of thepresent approach in applications to real complex plasmas are briefly discussed.

Fluid approach to evaluate sound velocity in Yukawa systems (complex plasmas)