Gas absorption with first-order chemical reaction in laminar falling films—calculation of rates and enhancement factors

✍ Scribed by R.J. Best; B. Hörner

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 333 KB
• Volume: 34
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(79)85131-3

✦ Synopsis

The ddierentml equation descnbmg the absorption of a gas by a hqmd film fallmg down a vertical wall can be solve-d. m the simple cases of (a) physlcal absorption and (b) absorption wnth fist-order chemical reaction, by the method of separabon of vmables and subsequent solution of the space equation wrlth Kummer's function[7] The resultant concentratcon profiles are used to evaluate absorption rates and enhancement factors (here defined as the ratto of the actual absorption rate to that m a very deep stagnant bquld wrth the same surface exposure tune but no chemrczd reaction) It IS found that the film Uuckness and velocity profile only have an Influence when the dlmenslontess group (p = fk/D IS less than 5 (D being the dtiuswlty of the dissolved gas m the hquld. f the film Uuckness and k the reaction rate constant) When the Hatta number, vhf', IS greater than 0 7, the enhancement factor IS given. for all values of cp. by a slmpbfied form of the solution with an error of less than 2%