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Chapter:

Modes-and-Diffusion

1. The term activated means _________


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2. Diffusion co-efficient in molecular diffusion is estimated by _____


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3. The value of N flux of A under steady state non-diffusing B with diffusing A is _____


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4. For liquid molecular diffusion of A and B, steady state equimolar counter diffusion N flux of A is negative of N flux of B.


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5. A spherical heater of 20 cm diameter and at 60 degree Celsius is immersed in a tank of water at 20 degree Celsius. Determine value of convective heat transfer coefficient


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6. For permanent gases diffusivity order is _____ sq.m/s


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7. Find diffusivity of AB in sq.m/sec if N flux of A 5 mol/sq.m sec, concentration difference is 2mol/cu.m and distance is 3 m.


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8. From reaction, Methane –> Carbon + 2(Hydrogen molecule) find ratio of N Flux of A to Total N flux( A+B); Given N Flux of B =-2 N flux of A.


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9. Consider above problem, find what percent of power is lost by free convection?


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10. Macroporic surrounding of microscopic pellets powders of different magnitude in size is ___


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Topics

This Chapter Modes-and-Diffusion consists of the following topics

Diffusion in Solids and Molecular Diffusion in Fluids

The term activated means _________

;

Diffusion co-efficient in molecular diffusion is estimated by _____

;

The value of N flux of A under steady state non-diffusing B with diffusing A is _____

;

For liquid molecular diffusion of A and B, steady state equimolar counter diffusion N flux of A is negative of N flux of B.

;

A spherical heater of 20 cm diameter and at 60 degree Celsius is immersed in a tank of water at 20 degree Celsius. Determine value of convective heat transfer coefficient

;

For permanent gases diffusivity order is _____ sq.m/s

;

Find diffusivity of AB in sq.m/sec if N flux of A 5 mol/sq.m sec, concentration difference is 2mol/cu.m and distance is 3 m.

;

From reaction, Methane –> Carbon + 2(Hydrogen molecule) find ratio of N Flux of A to Total N flux( A+B); Given N Flux of B =-2 N flux of A.

;

Consider above problem, find what percent of power is lost by free convection?

;

Macroporic surrounding of microscopic pellets powders of different magnitude in size is ___

;