Table 1 Geometric parameters of the inner twisted spiral tube (dimensions in mm).

From: Investigation of the hydraulic and thermal characteristics of a double concentric tubes with an inner twisted spiral tube

Specimen No.

S

S/D

H

H/D

Di, o

Do, o

L

1

3.9

0.278

0.95

0.068

15.8

22.2

1000

2

5.2

0.372

0.95

0.068

15.8

22.2

1000

3

8.2

0.586

0.95

0.068

15.8

22.2

1000

4

5.2

0.372

0.6

0.043

15.8

22.2

1000

5

5.2

0.372

1.15

0.082

15.8

22.2

1000

6 (smooth tube)

-––

–––

–––

–––

15.8

22.2

1000

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