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Surface reaction with combined forced and free convection
Author(s) -
Chang ChingYuan,
Guin James A.,
Roberts Loy D.
Publication year - 1976
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690220205
Subject(s) - rayleigh number , chemistry , mechanics , forced convection , sherwood number , thermodynamics , natural convection , free surface , convection , schmidt number , stream function , vorticity , nusselt number , vortex , physics , prandtl number , turbulence , reynolds number
The influence of combined forced and free convection on the surface reaction of a laminarly flowing species in a rectangular channel is studied. The free convective motion, which is superimposed upon the main axial flow, arises from a transverse density gradient produced by the release of a reaction product, or heat, at the channel wall. A numerical stream function‐vorticity method is employed to solve the three‐dimensional conservation equations in the case of large Schmidt number. Effects of aspect ratio, diffusivity ratio, surface reaction rate, and Rayleigh number upon the overall reactant conversion rate and local Sherwood number are examined. Reasonable agreement is obtained with experimental data for a hydrochloric acid‐calcium carbonate surface reaction.