Table 1 Compression ratios of thermal creep KPs with different geometric shapes and stage numbers

From: Knudsen pumps: a review

No. Sec.

1

2

3

4

5

8

16

25

Refs.

Fig. 10a

1.004

1.008

1.011

1.015

1.019

n/r

n/r

n/r

127

n/r

n/r

n/r

1.253

n/r

1.309

n/r

n/r

94

Fig. 10b

1.091

1.107

n/r

1.138

n/r

1.197

n/r

1.459

131,132

n/r

1.06

n/r

1.116

n/r

1.231

1.486

n/r

130

n/r

n/r

n/r

1.077

n/r

1.081

n/r

n/r

133

Fig. 10c

n/r

n/r

n/r

1.088

n/r

1.118

n/r

n/r

133

Fig. 10d

1.313

n/r

n/r

n/r

n/r

n/r

n/r

n/r

94

Fig. 10e

n/r

n/r

n/r

1.166

n/r

1.294

n/r

n/r

94