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<p>testing is often used for these design efforts.  Instrumented physical models can also examine internal flows, for the design of ductwork systems, pollution control equipment, food processing machines, and mixing vessels.  Transparent flow models are used in this case to observe the detailed flow phenomenon. These models are scaled in terms of both geometry and important forces, for example, using <a href="page.php?w=Froude_number">Froude number</a> or <a href="page.php?w=Reynolds_number">Reynolds number</a> scaling (see <a href="page.php?w=Similitude">Similitude</a>).</p><p>
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