P. Stehlik et al., COMPARISON OF CORRECTION FACTORS FOR SHELL-AND-TUBE HEAT-EXCHANGERS WITH SEGMENTAL OR HELICAL BAFFLES, Heat transfer engineering, 15(1), 1994, pp. 55-65
Heat transfer and pressure drop correction factors based on the Bell D
elaware method have been compared for an optimized segmental baffle he
at exchanger and a helical baffle heat exchanger In general, the resul
ts showed that properly designed helical baffles offer a significant i
mprovement in heat transfer while providing a reduced exchanger pressu
re drop. The enhancement in heat transfer for helical baffles was refl
ected by the so-called turbulence enhancement correction factor, which
accounted for the increase in heat transfer observed at a critical ba
ffle inclination angle of 25-degrees. As the baffle inclination angle
was increased beyond this critical angle, the turbulence enhancement f
actor continued to increase and eventually produced a maximum heat tra
nsfer enhancement of 1.39 times that for ideal cross-flow conditions.
The reduction in pressure drop due to the helical baffles was found to
vary from 0. 26 to 0. 60 depending on the helical inclination angle.