Enhancement of film condensation rate on vertical tubes by longitudinal fins
- 1 July 1968
- journal article
- research article
- Published by Wiley in AIChE Journal
- Vol. 14 (4) , 644-649
- https://doi.org/10.1002/aic.690140417
Abstract
Longitudinal rectangular fins loosely clamped to vertical tubes markedly increase the film condensation heat transfer coefficient. At a heat flux of 2×104B.t.u./hr.sq.ft., twelve ⅛×0.013 fins clamped to a ½ in. O.D. vertical tube 42 ½ in. long (thus doubling the surface area of the tube) gave a condensation coefficient of 15,000 ± 15% B.t.u./hr.sq.ft. °F. compared with 1,620 B.t.u./hr.sq.ft. °F. for the same tube without fins, a ratio ofh/hoof 9.2. The enhancement of the film condensation coefficient decreases as the heat flux increases and as the number of fins decreases.A model based on the effect of fin shape on film and rivulet hydrodynamics explains the observed behavior.Keywords
This publication has 6 references indexed in Scilit:
- Enhancement of Film Condensation Heat Transfer Rates on Vertical Tubes by Vertical WiresIndustrial & Engineering Chemistry Fundamentals, 1967
- The Use of Thin Films for Increasing Evaporation and Condensation Rates in Process EquipmentJournal of Heat Transfer, 1959
- SURFACE PHENOMENAPublished by Elsevier ,1959
- Effect of Vapor Velocity on Laminar and Turbulent-Film CondensationTransactions of the American Society of Mechanical Engineers, 1956
- Hautkondensation an feingewellten Oberflächen bei Berücksichtigung der OberflächenspannungenZeitschrift für angewandte Mathematik und Physik, 1954
- Heat Transfer and Pressure Drop of Liquids in TubesIndustrial & Engineering Chemistry, 1936