A cylindrical dryer having axial internal grooves and taper has shown remarkable improve-ment on the condensate heat transfer coefficient due to effective use of centrigugal force component.
The improvement increases with the speed and reaches 3.9 times of that of conventional flat dryer at 650 m/min.
The overall heat transfer coefficient, however, is improved 25% at 600 m/min due to the combined effects of shell itself and shell-web contact heat transfer coefficients which prevent flow of heat.
Surface temperature profile is within ±23°C except where condensate ponds are formed.
This profile is similar to that of conventional dryer.
