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A sintered solid of silica 1.5 mm thick is porous with a void fraction of 0.35 and a tortuosity of 4.0. The pores are filled with water at 298 K. At one face the concentration of KCI is held at 0.10 g-mol/l, and fresh water flows rapidly by the other side. Neglecting any resistances but that in the porous solid. DAB (KCI) in water is 1.87x10-9 m?/s at 298K. (1) Is DAR = DBA in diffusion in solids, and why? ВА (i) Please calculate the diffusion flux of KCI at steady state. (iii) Please calculate the effective diffusivity.

A sintered solid of silica 1.5 mm thick is porous with a void fraction of 0.35 and a tortuosity of 4.0. The pores are filled with water at 298 K. At one face the concentration of KCI is held at 0.10 g-mol/l, and fresh water flows rapidly by the other side. Neglecting any resistances but that in the porous solid. DAB (KCI) in water is 1.87x10-9 m?/s at 298K. (1) Is DAR = DBA in diffusion in solids, and why? ВА (i) Please calculate the diffusion flux of KCI at steady state. (iii) Please calculate the effective diffusivity.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A sintered solid of silica 1.5 mm thick is porous with a void fraction of 0.35 and a tortuosity of 4.0. The pores are filled with water at 298 K. At one face the concentration of KCI is held at 0.10 g-mol/l, and fresh water flows rapidly by the other side. Neglecting any resistances but that in the porous solid. DAB (KCI) in water is 1.87x109 m?/s at 298K. (i) Is DAB = De, in diffusion in solids, and why? ВА (ii) Please calculate the diffusion flux of KCI at steady state. (iii) Please calculate the effective diffusivity.
Transcribed Image Text:A sintered solid of silica 1.5 mm thick is porous with a void fraction of 0.35 and a tortuosity of 4.0. The pores are filled with water at 298 K. At one face the concentration of KCI is held at 0.10 g-mol/l, and fresh water flows rapidly by the other side. Neglecting any resistances but that in the porous solid. DAB (KCI) in water is 1.87x109 m?/s at 298K. (i) Is DAB = De, in diffusion in solids, and why? ВА (ii) Please calculate the diffusion flux of KCI at steady state. (iii) Please calculate the effective diffusivity.
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