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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= (9): '''Liquid Transport Coefficent of a Paint Layer''' =</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= (9): '''Liquid Transport Coefficent of a Paint Layer''' =</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><B>I want to examine the effect of driving rain on a painted wall. What liquid</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><B>I want to examine the effect of driving rain on a painted wall. What liquid</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>transport coefficients D<small>ws</small> do I enter for the paint?</B></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>transport coefficients D<small>ws</small> do I enter for the paint?</B></div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><P></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><P></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>There are no measurements of [[Details:LiquidTransportCoefficients | transport</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>There are no measurements of [[Details:LiquidTransportCoefficients | transport</div></td></tr>
</table>Lenhttps://www.wufi-wiki.com/mediawiki/index.php?title=FAQ:General:LiquidTransportCoefficentofaPaintLayer&diff=778&oldid=prevLen: Die Seite wurde neu angelegt: = (9): '''Liquid Transport Coefficent of a Paint Layer''' = <B>I want to examine the effect of driving rain on a painted wall. What liquid transport coefficients D<smal...2008-10-06T08:23:14Z<p>Die Seite wurde neu angelegt: = (9): '''Liquid Transport Coefficent of a Paint Layer''' = <B>I want to examine the effect of driving rain on a painted wall. What liquid transport coefficients D<smal...</p>
<p><b>Neue Seite</b></p><div>= (9): '''Liquid Transport Coefficent of a Paint Layer''' =<br />
<B>I want to examine the effect of driving rain on a painted wall. What liquid<br />
transport coefficients D<small>ws</small> do I enter for the paint?</B><br />
</P><br />
<P><br />
There are no measurements of [[Details:LiquidTransportCoefficients | transport<br />
coefficients]] or, equivalently, water absorption coefficients for paint layers<br />
themselves known to us.<br />
</P><br />
<P><br />
What is measured sometimes is the water uptake for different paint layers by applying<br />
the paint on a standard substrate (such as cellular concrete or lime cement mortar)<br />
and measuring the water absorption for this composite material.<br />
</P><br />
<P><br />
So the best thing you can do is probably the following:<BR><br />
Don't use a layer of rendering and a layer of paint; instead, use a layer of the 'hybrid'<br />
material for which you already know the combined water uptake from the measurements.<br />
Use the D<small>ws</small> from the hybrid water uptake (let it generate by WUFI from the<br />
measured water absorption coefficient) and use the D<small>ww</small> and other data from<br />
the original rendering.<br />
</P><br />
<P><br />
The [[Details:WaterVaporDiffusion | vapor diffusion resistance]] of the paint<br />
can then be included in the [[2D:Dialog_EditSurfaceCoefficients | surface<br />
transfer coefficients]] (as long as it is not markedly moisture-dependent).<br />
</P><br />
<P><br />
Please note some possible problems, though:<br />
</P><br />
* The result of the measurement may (or may not) depend on the substrate material, the details of the application etc. So you should make sure that you are using a water absorption value that has been measured under the same circumstances as the case you consider in your calculations.<br />
* The paint may slowly change its properties when it gets wet (e.g. by swelling). The mean properties over a rain period of two or three hours may be different than the mean properties during a measurement that takes many hours. Again, the measurement should be done close to natural conditions.<br />
<P></div>Len