AN INVESTIGATION ON FLOW AND HEAT TRANSFER CHARACTERISTICS IN THE SHELL SIDE OF SHELL-AND-TUBE HEAT EXCHANGER WITH SEPARATED BAFFLES PARALLEL TO SEGMENT AL BAFFLES

摘要

The shell-and-tube heat exchanger with separated baffles parallel to segmental baffles is proposed in this study, and an investigation on flow field, heat transfer and flow resistance characteristics in the shell side of the proposed heat exchanger and traditional single segmental baffled shell-and-tube heat exchanger is reported. In addition, performance of heat transfer enhancement of the shell-side-tube heat exchanger with or without separated baffles parallel to segmental baffles is evaluated and compared with each other at the same air volume flow rate. The heat transfer enhancement comprehensive evaluation factor η is in the range from 1.15 to 1.20 with the variation of Reynolds number (1.25 * 104～3.36 * 104). The results indicate that the flow field uniformization is enhanced in the shell side of shell-and-tube heat exchangers by two separated baffles parallel to segmental baffles and the performance of heat transfer is improved by controlling the dimension of vortices. The results can be used for reference in the next research.