एक समतल प्लेट के पार प्रवाह के लिए सीमा परत की विस्थापन मोटाई δ+ के लिए अभिव्यक्ति चुनें। 

1
\({\delta ^ + } = \mathop \smallint \limits_0^\delta \left( {1 - \frac{u}{{{u_\infty }}}} \right)dy\)
2
\({\delta ^ + } = \mathop \smallint \limits_0^\delta \frac{u}{{{u_\infty }}}dy\)
3
\({\delta ^ + } = \mathop \smallint \limits_0^\delta \frac{u}{{{u_\infty }}}\left( {1 - \frac{u}{{{u_\infty }}}} \right)dy\)
4
\({\delta ^ + } = \mathop \smallint \limits_0^\delta {\left( {\frac{u}{{{u_\infty }}}} \right)^2}dy\)

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