Experimental study of mass transfer around a turbulence promoter by the limiting current method

✍ Scribed by Do Hyun Kim; In Ho Kim; Ho Nam Chang

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 630 KB
• Volume: 26
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/s0017-9310(83)80125-2

✦ Synopsis

Local mass transfer rates around a turbulence promoter in a channel having the geometry of zigzagtype or cavity-type characterized by the location of promoters have been measured by the limiting current technique,

The experimental results showed that turbulence promoters are effective in breaking the concentration boundary layer and thus increasing the mass transfer rate. In the present experiment the Reynolds numbers were varied from 10to 200 for the different aspect ratios of3.5, 5 and 7. The experimentally obtained Sherwood numbers were compared with those numerically obtained by Kang and Chang. As a result, they were found to be in agreement to within an error of 20%. !'\O;\IE!'\CLATURE AR, aspect ratio, LIH; CO, bulk concentration; D, diffusivity; F, Faraday's constant (96487 C equiv" '): H, channel height; ilim' limiting current density; k, mass transfer coefficient; L, distance between the centers of successive promoters;