Heat transfer by laminar flow in a vertical pipe with twisted-tape inserts

摘要

Heat transfer for laminar flow of water in an air- cooled vertical copper pipe with four twisted-tape inserts was determined experimentally. The tests were executed for laminar flow within 110≤Re≤≤1500, 8.1≤Gz≤ 82.0 and 1.62≤y≤5.29. The correlation equation for heat transfer was defined for the tested range. The obtained results were compared to the results of other authors.