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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Reyn</span></h1>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr"><table class="infobox wikitable float-right" style="font-size:100%; margin-top:0; width:350px;" id="Vorlage_Infobox_Einheit" summary="Infobox Einheit">
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<th colspan="2" style="background:#FFDEAD;"><a href="Ma%C3%9Feinheit" title="Maßeinheit">Physikalische Einheit</a>
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<td style="min-width:7em;">Einheitenname</td>
<td>Reyn
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<td><a href="Einheitenzeichen" title="Einheitenzeichen">Einheitenzeichen</a>
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<td><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {Reyn} }">
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<mi mathvariant="normal">R</mi>
<mi mathvariant="normal">e</mi>
<mi mathvariant="normal">y</mi>
<mi mathvariant="normal">n</mi>
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<annotation encoding="application/x-tex">{\displaystyle \mathrm {Reyn} }</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f3fd23ea372105dd885cb50554e178e5a4a5c68a.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:5.263ex; height:2.509ex;" alt="{\displaystyle \mathrm {Reyn} }" loading="lazy"></span>
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<td><a href="Physikalische_Gr%C3%B6%C3%9Fe" title="Physikalische Größe">Physikalische Größe</a>
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<td><a href="Viskosit%C3%A4t" title="Viskosität">dynamische Viskosität</a>
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<td><a href="Formelzeichen" title="Formelzeichen">Formelzeichen</a>
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<td><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \eta }">
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<mi>η<!-- η --></mi>
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<annotation encoding="application/x-tex">{\displaystyle \eta }</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/e4d701857cf5fbec133eebaf94deadf722537f64.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:1.169ex; height:2.176ex;" alt="{\displaystyle \eta }" loading="lazy"></span>
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<td><a href="Dimension_(Gr%C3%B6%C3%9Fensystem)" title="Dimension (Größensystem)">Dimension</a>
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<td><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mathsf {M\;L^{-1}\;T^{-1}}}}">
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<mo mathvariant="sans-serif">−<!-- − --></mo>
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<annotation encoding="application/x-tex">{\displaystyle {\mathsf {M\;L^{-1}\;T^{-1}}}}</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/30828632f68a6b444b9706bd84e14f3ea82cea74.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:10.832ex; height:2.676ex;" alt="{\displaystyle {\mathsf {M\;L^{-1}\;T^{-1}}}}" loading="lazy"></span>
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<td>System
</td>
<td><a href="Angloamerikanisches_Ma%C3%9Fsystem" title="Angloamerikanisches Maßsystem">Angloamerikanisches Maßsystem</a>
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<td>In <a href="Internationales_Einheitensystem#SI-Einheiten" title="Internationales Einheitensystem">SI-Einheiten</a>
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<td><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {1\,Reyn\approx 6\,894{,}76\;Pa\,s} }">
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<mn>6</mn>
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<mn>894</mn>
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<mn>76</mn>
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<annotation encoding="application/x-tex">{\displaystyle \mathrm {1\,Reyn\approx 6\,894{,}76\;Pa\,s} }</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/bf8eb63d4d3e0bfe8bb0d062f2b4b0dfbab3f8e5.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:22.614ex; height:2.509ex;" alt="{\displaystyle \mathrm {1\,Reyn\approx 6\,894{,}76\;Pa\,s} }" loading="lazy"></span>
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<td>Benannt nach
</td>
<td><a href="Osborne_Reynolds" title="Osborne Reynolds">Osborne Reynolds</a>
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<td>Abgeleitet von
</td>
<td><a href="Pound-force_per_square_inch" title="Pound-force per square inch">Pound-force per square inch</a>, <a href="Sekunde" title="Sekunde">Sekunde</a>
</td></tr></tbody></table>
<p>Das <b>Reyn</b> ist eine veraltete<sup id="cite_ref-Kurzweil_1-0" class="reference"><a href="#cite_note-Kurzweil-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="Ma%C3%9Feinheit" title="Maßeinheit">Einheit</a> der dynamischen <a href="Viskosit%C3%A4t" title="Viskosität">Viskosität</a>, die zum <a href="Angloamerikanisches_Ma%C3%9Fsystem" title="Angloamerikanisches Maßsystem">angloamerikanischen Maßsystem</a> gehört. Sie ist nach dem britischen Physiker <a href="Osborne_Reynolds" title="Osborne Reynolds">Osborne Reynolds</a> benannt, von dem wichtige Beiträge der <a href="Str%C3%B6mungsmechanik" title="Strömungsmechanik">Strömungsmechanik</a> stammen (vgl. etwa <a href="Reynolds-Zahl" title="Reynolds-Zahl">Reynolds-Zahl</a> und <a href="Reynolds-Gleichungen" title="Reynolds-Gleichungen">Reynolds-Gleichungen</a>).
</p><p>Die Einheit ist als <b>Psi-Sekunde</b> definiert, wobei Psi eine verkürzte Bezeichnung der <a href="Druck_(Physik)" title="Druck (Physik)">Druckeinheit</a> <a href="Pound-force_per_square_inch" title="Pound-force per square inch">Pound-force per square inch</a> darstellt. Für die Umrechnung in die <a href="CGS-Einheitensystem" title="CGS-Einheitensystem">CGS-Einheit</a> <a href="Poise" title="Poise">Poise</a> bzw. in die <a href="Internationales_Einheitensystem" title="Internationales Einheitensystem">SI-Einheit</a> Pascalsekunde gilt:<sup id="cite_ref-Kurzweil_1-1" class="reference"><a href="#cite_note-Kurzweil-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
<dl><dd>1 Reyn = 1 Psi-Sekunde (lb<sub>f</sub>/in²·sec) ≈ 68 947 Poise = 6 894,76 Pascalsekunden (Pa·s)</dd></dl>
<p>Da es sich beim Reyn um eine vergleichsweise große Einheit handelt, ist sein millionster Teil, das Mikroreyn, gebräuchlicher.<sup id="cite_ref-Ugural_2-0" class="reference"><a href="#cite_note-Ugural-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-Kurzweil-1"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Kurzweil_1-0">a</a></sup> <sup><a href="#cite_ref-Kurzweil_1-1">b</a></sup></span> <span class="reference-text">Peter Kurzweil: <cite style="font-style:italic">Das Vieweg Einheiten-Lexikon</cite>. 2., erweiterte und aktualisierte Auflage. Springer, Wiesbaden 2000, ISBN 978-3-322-83212-2, <span style="white-space:nowrap">S.<span style="display:inline-block;width:.2em"> </span>345</span> (<a rel="nofollow" class="external text" href="https://books.google.de/books?id=xs2fBgAAQBAJ&pg=PA345#v=onepage">eingeschränkte Vorschau</a> in der Google-Buchsuche).<span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rfr_id=info:sid/de.wikipedia.org:Reyn&rft.au=Peter+Kurzweil&rft.btitle=Das+Vieweg+Einheiten-Lexikon&rft.date=2000&rft.edition=2.%2C+erweiterte+und+aktualisierte&rft.genre=book&rft.isbn=9783322832122&rft.pages=345&rft.place=Wiesbaden&rft.pub=Springer" style="display:none"> </span></span>
</li>
<li id="cite_note-Ugural-2"><span class="mw-cite-backlink"><a href="#cite_ref-Ugural_2-0">↑</a></span> <span class="reference-text">Ansel C. Ugural: <cite style="font-style:italic">Mechanical Engineering Design (SI Edition)</cite>. 3. Auflage. CRC Press, Boca Raton 2022, ISBN 978-1-00-325137-8, <span style="white-space:nowrap">S.<span style="display:inline-block;width:.2em"> </span>389</span> (<a rel="nofollow" class="external text" href="https://books.google.de/books?id=IfFmEAAAQBAJ&pg=PA389#v=onepage">eingeschränkte Vorschau</a> in der Google-Buchsuche).<span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rfr_id=info:sid/de.wikipedia.org:Reyn&rft.au=Ansel+C.+Ugural&rft.btitle=Mechanical+Engineering+Design+%28SI+Edition%29&rft.date=2022&rft.edition=3.&rft.genre=book&rft.isbn=9781003251378&rft.pages=389&rft.place=Boca+Raton&rft.pub=CRC+Press" style="display:none"> </span></span>
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