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Bi-velocity transport processes. Single-component liquid and gaseous continua

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  • Brenner, Howard

Abstract

The present contribution supplements the previous findings regarding the need for two independent velocities rather than one when quantifying mass, momentum and energy transport phenomena in fluid continua. Explicitly, for the case of single-component fluids the present paper furnishes detailed expressions for the phenomenological coefficients appearing in the constitutive equations governing these bi-velocity transport processes. Whereas prior analyses furnished coefficient values only for the case of dilute monatomic gases using data from Burnett’s solution of the Boltzmann equation, the present study furnishes values applicable to all fluids, liquids as well as dense gases. Moreover, whereas prior coefficient calculations derived these values (for dilute monatomic gases) from Burnett’s solution of Boltzmann’s gas-kinetic equation, the latter a molecular theory, the present analysis derives the liquid- and gas-phase values from purely macroscopic data requiring knowledge only of the fluid’s coefficients of thermal expansion, isothermal compressibility, and thermometric diffusivity. In the dilute monatomic gas case common to both levels of analysis, the respective molecularly and macroscopically derived phenomenological coefficients are found to be in excellent agreement, confirming the credibility of both bi-velocity theory and the theory establishing the values of the phenomenological coefficients appearing in the constitutive relations derived therefrom. Whereas the preceding macroscopic calculations invoked Onsager’s reciprocal theorem relating coupled phenomenological coefficients, an alternative scheme is presented at the conclusion of the paper, one that reverses the usual order of things, at least in the present single-component fluid case. This alternate scheme enables Onsager’s nonequilibrium reciprocal relation, originally derived by him using molecular arguments, to be derived using purely macroscopic arguments originating from knowledge of Maxwell’s equilibrium reciprocal relations, the latter fundamental to equilibrium thermodynamics.

Suggested Citation

  • Brenner, Howard, 2010. "Bi-velocity transport processes. Single-component liquid and gaseous continua," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 389(7), pages 1297-1316.
  • Handle: RePEc:eee:phsmap:v:389:y:2010:i:7:p:1297-1316
    DOI: 10.1016/j.physa.2009.12.022
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    References listed on IDEAS

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    1. Brenner, Howard, 2005. "Kinematics of volume transport," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 349(1), pages 11-59.
    2. Brenner, Howard, 2009. "Bi-velocity hydrodynamics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 388(17), pages 3391-3398.
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    Cited by:

    1. Brenner, Howard, 2010. "Diffuse volume transport in fluids," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 389(19), pages 4026-4045.

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