Decoupling of micro- and macromixing in turbulent reacting flow

✍ Scribed by Vivek V. Ranade

• Book ID: 102696251
• Publisher: American Institute of Chemical Engineers
• Year: 1992
• Tongue: English
• Weight: 519 KB
• Volume: 38
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690380316

✦ Synopsis

Closure models of mean reaction terms for turbulent reacting flows have been subject of many recent studies (Heeb and Brodkey, 1990;. Most of these models, however, consider micromixing as a controlling step and assume complete macromixing in the reactor. Almost all of these models are onedimensional and do not readily extend to multidimensional systems where macro-as well as micromixing are important.

Recently, Ranade and Bourne (1991) have proposed a new mechanistic model that can simulate interactions of micro-and macromixing in multidimensional systems, based on the engulfment model of . In this work, we propose to place that model in proper perspective by comparing it with other closure models recently proposed for turbulent reactive mixing. It has been recognized that rapid competing reactions of the type:

B + R -S

(2) are particularly sensitive to micromixing and can be used to discriminate various closure models. All the discussion presented here, therefore, refers to this reaction system.