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19.3-8 19.4-1 ZID 19.4-2. Transition-Region Diffusion. A mixture of He (A) and Ar (B) at 298 K is diffusing through an open capillary 15 mm long with a radius of 1000 A. The total 1.013 x 10 Pa. The molecular diffusivity DAB at 1.013 x 10° Pa is 7.29 x 10-m2/s (a) Calculate the Knudsen diffusivity of He (A) (b) Predict the flux NA using Eq. (19.4-18) and Eq. (19.4-12) if XA1 0.8 and XA2= 0.2. Assume steady state. (c) Predict the flux NA using the approximate Eqs. (19.4-14) and (19.4-16). pressure is H o 2do s) 2el t Chapter 19 Steady-State Mass Transfer A 1 DNA Eq. (19.3- 1/DAB1/DKA (19.4-13) АВ The diffusivity is then independent of concentration and is constant. Integration of Eq. (19.4-10) DNAP D'NA then gives х A1 х (19.4-14) 4 DTI A1 RTL MA 19.4-13 MA +DAe DEA Dre 19.4-12 In dRTL A1 19. 414 NA A RTL PA PAZ RTL 19.4.16 DiVA DRA PA PAZ A2 AI RTL Part 1 Transport Processes: Momentum, Heat, and Mass 541

19.3-8 19.4-1 ZID 19.4-2. Transition-Region Diffusion. A mixture of He (A) and Ar (B) at 298 K is diffusing through an open capillary 15 mm long with a radius of 1000 A. The total 1.013 x 10 Pa. The molecular diffusivity DAB at 1.013 x 10° Pa is 7.29 x 10-m2/s (a) Calculate the Knudsen diffusivity of He (A) (b) Predict the flux NA using Eq. (19.4-18) and Eq. (19.4-12) if XA1 0.8 and XA2= 0.2. Assume steady state. (c) Predict the flux NA using the approximate Eqs. (19.4-14) and (19.4-16). pressure is H o 2do s) 2el t Chapter 19 Steady-State Mass Transfer A 1 DNA Eq. (19.3- 1/DAB1/DKA (19.4-13) АВ The diffusivity is then independent of concentration and is constant. Integration of Eq. (19.4-10) DNAP D'NA then gives х A1 х (19.4-14) 4 DTI A1 RTL MA 19.4-13 MA +DAe DEA Dre 19.4-12 In dRTL A1 19. 414 NA A RTL PA PAZ RTL 19.4.16 DiVA DRA PA PAZ A2 AI RTL Part 1 Transport Processes: Momentum, Heat, and Mass 541

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
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19.3-8 19.4-1 ZID 19.4-2. Transition-Region Diffusion. A mixture of He (A) and Ar (B) at 298 K is diffusing through an open capillary 15 mm long with a radius of 1000 A. The total 1.013 x 10 Pa. The molecular diffusivity DAB at 1.013 x 10° Pa is 7.29 x 10-m2/s (a) Calculate the Knudsen diffusivity of He (A) (b) Predict the flux NA using Eq. (19.4-18) and Eq. (19.4-12) if XA1 0.8 and XA2= 0.2. Assume steady state. (c) Predict the flux NA using the approximate Eqs. (19.4-14) and (19.4-16). pressure is H o 2do s) 2el t Chapter 19 Steady-State Mass Transfer
Transcribed Image Text:19.3-8 19.4-1 ZID 19.4-2. Transition-Region Diffusion. A mixture of He (A) and Ar (B) at 298 K is diffusing through an open capillary 15 mm long with a radius of 1000 A. The total 1.013 x 10 Pa. The molecular diffusivity DAB at 1.013 x 10° Pa is 7.29 x 10-m2/s (a) Calculate the Knudsen diffusivity of He (A) (b) Predict the flux NA using Eq. (19.4-18) and Eq. (19.4-12) if XA1 0.8 and XA2= 0.2. Assume steady state. (c) Predict the flux NA using the approximate Eqs. (19.4-14) and (19.4-16). pressure is H o 2do s) 2el t Chapter 19 Steady-State Mass Transfer
A 1 DNA Eq. (19.3- 1/DAB1/DKA (19.4-13) АВ The diffusivity is then independent of concentration and is constant. Integration of Eq. (19.4-10) DNAP D'NA then gives х A1 х (19.4-14) 4 DTI A1 RTL MA 19.4-13 MA +DAe DEA Dre 19.4-12 In dRTL A1 19. 414 NA A RTL PA PAZ RTL 19.4.16 DiVA DRA PA PAZ A2 AI RTL Part 1 Transport Processes: Momentum, Heat, and Mass 541
Transcribed Image Text:A 1 DNA Eq. (19.3- 1/DAB1/DKA (19.4-13) АВ The diffusivity is then independent of concentration and is constant. Integration of Eq. (19.4-10) DNAP D'NA then gives х A1 х (19.4-14) 4 DTI A1 RTL MA 19.4-13 MA +DAe DEA Dre 19.4-12 In dRTL A1 19. 414 NA A RTL PA PAZ RTL 19.4.16 DiVA DRA PA PAZ A2 AI RTL Part 1 Transport Processes: Momentum, Heat, and Mass 541
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