Applied Mathematics & Information Sciences

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The mass diffusion relaxation time constant is derived on the basis of relaxed model with unequal phase-mass diffusion for a binary mixture. The mass diffusion and state equations are solved analytically for two finite boundaries. The relaxation time is affected by void fraction and vaporized mass diffusion fraction values. Mass diffusion relaxation time obtained in this work has a larger values than that obtained by Mohammadein [9] and Moby Dick experiment [3]; which satisfied for some values of the physical parameters.