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Fig. 2. SEM images of pipe cross section for fused silica (FS2, a) and stainless steel (SS1, b) pipes.

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Fig. 3. Friction factor for microtubes FS2 (a) and FS3(b) obtained at ENEA (helium) and at DIENCA (nitrogen).

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Fig. 4. Friction factor for micropipe FS1 using the nominal and the actual diameter.

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Fig. 5. The coefficient C∗ defined in Eq. (3) as a function of the Reynolds number.

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Fig. 6. Friction factor as a function of the Reynolds number in the transition region.

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Fig. 7. Critical Reynolds number as a function of L/D: influence of roughness (a) and transition type (b).

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Fig. 8. Poiseuille number as a function of the Reynolds number for FS3 micropipe.