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# 3.6: The Thickness of the Viscous Sub Layer δv

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Very close to the pipe wall the flow is laminar in the so called viscous sub layer. The thickness of the viscous sub layer is defined as:

$\ \delta_{\mathrm{v}}=11.6 \cdot \frac{v_{1}}{\mathrm{u}_{*}}$

This page titled 3.6: The Thickness of the Viscous Sub Layer δv is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Sape A. Miedema (TU Delft Open Textbooks) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.

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