lec22_05042007_g - 10.37 Chemical and Biological Reaction...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
10.37 Chemical and Biological Reaction Engineering, Spring 2007 Prof. William H. Green Lecture 22: Combined Internal & External Transport Resistances Packed Bed Reactor Æ use PFR equation eff i i dF Ar dz = z=0 z=L Figure 1. Packed Bed Reactor eff chem ii rr Æ eff chem if ? 1 Ω≈ if ? 1 Ω ± ( ) –weird 1 Ω> porous catalyst particle d p BL: δ Figure 2. Porous Catalyst Particle Biot Number: external heat transfer resistance internal heat transfer resistance i B Mass transfer Biot Number: Cite as: William Green, Jr., course materials for 10.37 Chemical and Biological Reaction Engineering, Spring 2007. MIT OpenCourseWare (http://ocw.mit.edu), Massachusetts Institute of Technology. Downloaded on [DD Month YYYY].
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
m cp i eff inside kd B D = where fluid c D k δ diameter m fluid i eff inside D B D = Mears’ Test: if () 0.15 observed Ab p cA b u l k rR n kC ρ < where n order of rxn then (no external diffusion limitation) Æ i.e. no changing concentration across the boundary layer Ab As CC Similarly, if 2 0.15
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/27/2011 for the course CHEMICAL E 10.302 taught by Professor Clarkcolton during the Fall '04 term at MIT.

Page1 / 3

lec22_05042007_g - 10.37 Chemical and Biological Reaction...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online