Abstract: In order to explore the effect of helix angle on the heat transfer performance of sextant helical baffle heat exchanger, numerical simulation is adopted to study the heat transfer performance of sextant helical baffle heat exchanger under different flow rates with liquid water as the working medium, and to analyze the effect of helix angle change on the heat transfer coefficient and the comprehensive performance of heat transfer.The results show that with the increase of the helix angle, the surface heat flux along the axial direction of the heat exchanger tube decreases, and the heat transfer coefficient and pressure drop at the shell side also decrease; the comprehensive heat transfer performance indexes hs/Δp and hs/Δp^1/3 increase with the increase of helix angle, while under the condition of helix angle b= 25°, hs/Δp and hs/Δp^1/3 decreases significantly. Therefore, a larger helix angle can achieve better heat transfer performance. The research results can provide reference for the engineering application of the sextant helical baffleheat exchanger.

Key words: heat exchanger with helical baffle, helical angle, numerical simulation, heat transfer