Fluid flow analysis and extension of rapid design algorithm for helical baffle heat exchangers

摘要

"Shell-and-tube heat exchanger with helical baffles" is one of the new technologies used to improve the performance of common heat exchangers with segmental baffles. In this paper, after a short introduction of the technology, investigations of fluid flow pattern are carried out. By creating different arrangements of the helical baffles, the comparison between these types of baffles and the segmental one has been performed. Then, by using derived pressure drop relationship and the rapid design algorithm, some equations for both turbulent and laminar regimes are developed which relate pressure drop to heat transfer coefficient and heat transfer area. With the help of these relationships a straightforward design procedure has been developed. (C) 2007 Elsevier Ltd. All rights reserved.