Q3) Pulverized coal pellets, which may be approximated as carbon spheres of radius R = 1.5 %3D mm, are burned in a pure oxygen atmosphere at 1400K and 1.2 atm. Oxygen is transferred to the particle surface by diffusion, where it is consumed in the reaction, C(s) + O2(g) → CO2(g). The reaction rate is first order and of the form R =-k.Co2 at r = R where k = 0.12 m/s. This is %3D the reaction rate per unit surface area of the carbon pellets. Neglecting change in R, determine the steady-state O2 molar consumption rate in mol/s. At 1400K, the binary diffusion coeffici- for O2 and CO, is 1,6×104 m²/s.

Q3) Pulverized coal pellets, which may be approximated as carbon spheres of radius R = 1.5 %3D mm, are burned in a pure oxygen atmosphere at 1400K and 1.2 atm. Oxygen is transferred to the particle surface by diffusion, where it is consumed in the reaction, C(s) + O2(g) → CO2(g). The reaction rate is first order and of the form R =-k.Co2 at r = R where k = 0.12 m/s. This is %3D the reaction rate per unit surface area of the carbon pellets. Neglecting change in R, determine the steady-state O2 molar consumption rate in mol/s. At 1400K, the binary diffusion coeffici- for O2 and CO, is 1,6×104 m²/s.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Q3) Pulverized coal pellets, which may be approximated as carbon spheres of radius R = 1.5
mm, are burned in a pure oxygen atmosphere at 1400K and 1.2 atm. Oxygen is transferred to
the particle surface by diffusion, where it is consumed in the reaction,
C(s) + O2(g) → CO2(g).
The reaction rate is first order and of the form R = -k.Co2 at r = R where k = 0.12 m/s. This is
the reaction rate per unit surface area of the carbon pellets. Neglecting change in R, determine
the steady-state O2 molar consumption rate in mol/s. At 1400K, the binary diffusion coeffici
for O2 and CO2 is 1.6x104 m2/s.

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