Analysis of Laminar Flow Heat Transfer in Uniform Temperature Circular Tubes with Tape Inserts

摘要

Constant property, laminar flow heat transfer in a semi-circular tube with uniform wall temperature has been analyzed to define the lower bound of heat transfer augmentation in circular tubes with twisted-tape inserts. Two thermal boundary conditions, which correspond to the two extremes of the fin effect of twisted tapes encountered in practical applications, are considered. Numerical solutions, employing finite-difference formulations for the governing momentum and energy equations were carried out for the thermal entrance region and for fully developed flow.