For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?
Correct answer: C. Chemical reaction
- A. Film diffusion
- B. Diffusion through ash layer
- C. Chemical reaction
- D. Either A., B. or C.
Explanation
For the surface-reaction-controlled shrinking-particle model, the time for a specified conversion is proportional to particle diameter. Film diffusion also gives a diameter dependence, but ash-layer diffusion gives a diameter-squared dependence, so the intended specific answer is chemical reaction.
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