Turbulence level significance of the coalescence-dispersion rate parameter

✍ Scribed by R.M. Canon; K.W. Wall; A.W. Smith; G.K. Patterson

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 433 KB
• Volume: 32
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(77)85030-6

✦ Synopsis

The random coalescence-and-dispersion (C-D) models for non-ideal mixing in reactors mvolve a rate parameter, Z, which IS the frequency of the coalescence and dispersion events divided by the aviulable number of coalescence sites per unit residence time, where residence hme IS a measure of reactor size An approximate relationship between Z and hydrodynannc parameters has been found by carefully comparmg C-D computations, where Z vanes wdh location, with actual measurements of the turbulent energy dissipation rate, e, and the turbulence length scale, L,, m a tubular reactor At each locatIon Z was determined such that the calculated conversion of a second-order reaction matched the measured conversion The relahonshlp found was Z = 1333(6/L Z)""(?/iv) s where L, 1s the length scale of segregation, E has dimensions of velocity squared per unit time, and (?/N) IS the residence time divided by the number of coalescence sites The relattonshm above was auuhed to the C-D modeling of a semi-batch reactor with a consecuttve-competve reaction The res&ng yields and selectrvrties under the close to experimental results