Enhancement of film condensation rate on vertical tubes by longitudinal fins

✍ Scribed by David G. Thomas

• Publisher: American Institute of Chemical Engineers
• Year: 1968
• Tongue: English
• Weight: 658 KB
• Volume: 14
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690140417

✦ Synopsis

Longitudinal rectangular fins loosely clamped to vertical tubes markedly increase the film condensation heat transfer coefficient. At a heat flux of 2 X 104 B.t.u./hr.sq.ft., twelve 1/8 x 0.013 fins clamped to a '/i in. O.D. vertical tube 42% in. long (thus doubling the surface area of the tube) gave a condensation coefficient of 15,000 k 15% B.t.u./hr.sq.ft. "F. compared with 1,620 B.t.u./hr.sq.ft. O F . for the same tube without fins, a ratio of h/ho of 9.2. The enhancement of the film condensation coefficient decreases as the heat flux increases and as the number of fins decreases.