spirally

Leaver fleshy, squamose, spirally arranged, yellowish-white.

叶肉质，鳞片状，螺旋状排列，淡。

The mainstructure parameters of spirally grooved tube are diameter of tube, fin pitch,corrugation depth, wall thickness, spirally angle and spira.

螺旋槽管(亦称螺纹管)是其中个重要分支,它是种优良高效异形强化传热管件。