关键词: 螺旋折流板换热器, 三分螺旋折流板, 倾斜角, 综合性能

Abstract: Experimental study was conducted in trisection helical baffle heat exchangers with three sector baffle schemes of tilt angles 10°,15° and 20°,an ellipse baffle scheme of tilt angle 15°,and an axial overlap sector baffle scheme of tilt angle 20°,in contrast to a segmental baffle heat exchanger. Each helix heat exchanger has 48 tubes with layout of one third division of shell cylinder for each baffle, while the segmental baffle heat exchanger has 49 tubes. The data of the shell side, Nusselt number Nu_o, axial Euler number Eu_z,o, and comprehensive performance indicator Nu_o/Eu_z,o are presented versus the shell side axial Reynolds number Re_z,o. The results show that the heat exchanger with the scheme of periphery connected sector baffles with tilt angle of 20° has the best performance, whose average comprehensive performance indicator Nu_o/Eu_z,o is 69.8% higher than that of segmental baffle heat exchanger, while the comprehensive performance indicator of the scheme with tilt angle 10°is lower than that of segmental baffle scheme. With the same tilt angle, the performance with the periphery connected connection baffle scheme is better than that with the axial overlap baffle scheme, and the performance with the sector baffle scheme is better than that with the ellipse baffle scheme.

Key words: helical baffle heat exchanger；trisection helical baffles；tilt angle, comprehensive performance indicator