Table 1: Comparison of calculated reference areas for helical and cylindrical tubes for different tube dimensions.

( 𝑝 , 𝑟 , 𝑟 𝑡 ) OrientationCylindrical tubeHelical tube

(4, 2, 1)Parallel3.1425.13
Perpendicular200431.63
(4, 1, 1)Parallel3.1412.57
Perpendicular200284.52
(4, 0.5, 1)Parallel3.147.07
Perpendicular200225.08
(1, 1, 1)Parallel3.1412.57
Perpendicular200379.55