Tutorial Modeling of monolith reactors

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Nusselt and Sherwood numbers • So, what should we choose for the correct value? • On the bright side, for circular channels, it might not be that important: 100 Percentage Conversion 80 60 40 20 Nu = 4 Nu = 3 Nu = 5 Nu = 30 Axial conversion for a typical monolith channel for CO oxidation. More, MSc Thesis, University of Alberta, 2007 0 0.00 0.02 0.04 0.06 0.08 0.10 Axial Distance, m 46
Nusselt and Sherwood numbers • However, for non-circular channels, or non-uniform washcoat, the Nu and Sh can vary around the washcoat perimeter. (a) Sherwood number 6 5 4 3 2 550K 600K 650K 700K 750K 800K 850K 900K Sherwood number along the washcoat/channel interface for the case of a circular channel in a square substrate. Interface length shown corresponds to 1/8th of the total interface. Fully developed flow. 1 0 50 100 150 200 250 300 350 400 Distance along the interface, microns Hayes et al. Chem. Eng. Sci., 59 3169 (2004). 47
Page 1 and 2: Introduction to Monolith Reactor Mo
Page 3 and 4: Why use computer modelling? • Exp
Page 5 and 6: Observations • The problem involv
Page 7 and 8: Model Scales Micro scale: At the at
Page 9 and 10: Mathematical formulation • The fu
Page 11 and 12: Basic models in common use • Sing
Page 13 and 14: The 3D SCM • The real monolith do
Page 15 and 16: The 2D approximate SCM • The 2D m
Page 17 and 18: The 2D SCM • All of the physical/
Page 19 and 20: Modelling the fluid domain Velocity
Page 21 and 22: Modelling the washcoat domain • T
Page 23 and 24: Diffusion in the washcoat • Diffu
Page 25 and 26: Modelling the substrate domain The
Page 27 and 28: Comparing 2D and 3D models • The
Page 29 and 30: Comparing 2D and 3D models • The
Page 31 and 32: Comparing 2D and 3D models Percenta
Page 33 and 34: Review of boundary layer flow Flow
Page 35 and 36: Boundary layers in a tube • At th
Page 37 and 38: Heat and mass transfer • Heat and
Page 39 and 40: 1D SCM mass balances The fluid phas
Page 41 and 42: 1D SCM energy balances The fluid ph
Page 43 and 44: Nusselt and Sherwood numbers • Fo
Page 45: Nusselt and Sherwood numbers • Ho
Page 49 and 50: Simplified 1D models • Dispersion
Page 51 and 52: Models for the converter • In rea
Page 53 and 54: Discrete converter models • A pas
Page 55 and 56: Momentum balance equation Velocity
Page 57 and 58: Energy balances The fluid phase ene
Page 59 and 60: Continuum model • In effect, the
Page 61 and 62: Model validation • All models mus
Page 63 and 64: Model validation - Example Heating
Page 65: Advertising supplement R.E. Hayes a

Tutorial Modeling of monolith reactors

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