Table 5 Levels and codes of the factors.

From: Drag enhancement characteristics and mechanism of the seam plate formed by uniform micro gap arrangement of multiple micro cylinders

Code x

X1 microcylinder diameter/μm

X2 gap to diameter ratio

X3 flow velocity/m·s−1

 + 1.682

70

1.4

0.6

 + 1

58

1.2

0.5

0

40

0.9

0.35

− 1

22

0.6

0.2

− 1.682

10

0.4

0.1

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