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 Nuo

axial Euler number Euz

o

and comprehensive performance indicator Nuo/Euz

o are presented versus the shell side axial Reynolds number Rez

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 Nuo/Euz

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.