Numerical simulation on circle tube and alternating elliptical axis tube with fouling thickness of0.5mm

1.0mm

1.5mm and 2.0mm was carried out to analyze the effects of fouling on velocity field

temperature field

synergy angle and and synergy number

under conditions with Renolds number of10 000

12 000

18 000

24 000 and 30 000.Moreover

comparative analysis on circular tube and alternating elliptical axis tube was performed.The results indicate that

in the alternating elliptical axis tube

the field synergy number decreases with the increasing Reynolds number while increases with the fouling thickness.The average synergy angle has the opposite changes.Along the tube length

the field synergy number decreases gradually

it has two maximum peaks and two minimum peaks within each transition section.The alternating elliptical axis tube has greater mean-field synergy number but smaller average synergy angle than the circle tube.