Browse Publications Technical Papers 2020-28-0362
2020-09-25

DESIGN AND ANALYSIS OF HELICAL BAFFLED SHELL AND TUBE HEAT EXCHANGER USING NUMERICAL METHODS 2020-28-0362

The ideology behind the project is to alter the helical angle of the baffles attached to the heat exchanger such that it increases the velocity of the flow of high viscous fluids. Investigations of thermo-hydraulic performance were conducted on five trisection helical baffle heat exchangers with different inclination angles, baffle shapes, or connection patterns, and one segmental baffle heat exchanger (SEG). A comparative analysis of three sector baffle schemes with inclination angles of 10° (10°S), 15° (15°S), and 20° (20°S); an ellipse baffle scheme with an inclination angle of 15° (15°E); and an axial overlap sector baffle scheme with an inclination angle of 20° (20°D) was performed. Local images were constructed to obtain pressure loss characteristics and flow field distributions. The flow field characteristics, such as the Dean vortex secondary flow and bypass leakage between adjacent baffles, are clearly shown and discussed. The same inclination angle schemes have completely different properties because of the baffle shapes or connection patterns. The performance of the end-to-end scheme is superior to that of the axial overlap scheme, and the ellipse baffle scheme is inferior to the sector baffle scheme. The 20°S scheme has the optimum comprehensive index and lowest shell-side pressure loss. The 10°S scheme has the highest shell-side Nusselt number and shell-side pressure loss, and can be selected only when heattransfer capability is very important in an engineering application.

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