Critical Dynamics Near the Liquid-Vapour Transition in Mixtures

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Abstract
The critical behaviour of thermal conductivity, mass diffusion, thermal-diffusion ratio and shear viscosity near a plait point is calculated within a non-asymptotic field-theoretical renormalization group theory applied to model H' of Siggia, Halperin and Hohenberg. The theoretical expressions for the transport coefficients are compared with the corresponding results at the consolute point and the differences can be traced back to the different identification of the order parameter. Agreement is found with measurements in 3He-4He mixtures.