The effect of vapour shear and condensate drainage in condensers using roped tubes

✍ Scribed by J. Cunningham; M. Bahjernejad

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 714 KB
• Volume: 45
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(83)87020-9

✦ Synopsis

It is well known that the heat transfer performance of a condensing heat exchanger can be improved by using roped or spirally indented tubes. Most of the published work refers to experiments carried out on single tubes in closely controlled laboratory experiments. If such tubes are to be used in practical situations the designer must know how they will perform in tube bundles. One of the main problems in condensers iS the effect of condensate drainage(inundation) and vapour shear on the performance of that condenser. A series of experiments have been carried out in three different tube bundles of 21 tubes in order to investigate the above phenanenon. One of the bundles was of plain tubes the other two were of roped tubes of the same diameter, groove pitch and groove depth but of differing helix angle. These values were llmn., 0.2nm1. and 6.4~nn. respectively. The tubes were all O.&n long. The main experimental variables were cooling water velocity and logarithmic mean temperature difference.