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<p>65.35.101.246: /* Commercial and recreational use */</p> <hr /> <div>{{Unreferenced stub|auto=yes|date=December 2009}}<br /> '''Dispersive mass transfer''', in [[fluid dynamics]], is the spreading of mass from highly concentrated areas to less concentrated areas. It is one form of [[mass transfer]].<br /> <br /> Dispersive mass flux is analogous to [[diffusion]], and it can also be described using [[Fick's law|Fick's first law]]:<br /> <br /> :&lt;math&gt;J = -E \frac{dc}{dx}, &lt;/math&gt;<br /> <br /> where c is mass concentration of the species being dispersed, E is the dispersion coefficient, and x is the position in the direction of the concentration gradient. Dispersion can be differentiated from diffusion in that it is caused by non-ideal flow patterns (i.e. deviations from [[plug flow]]) and is a macroscopic phenomenon, whereas diffusion is caused by random molecular motions (i.e. [[Brownian motion]]) and is a microscopic phenomenon. Dispersion is often more significant than diffusion in [[convection]]-diffusion problems. The dispersion coefficient is frequently modeled as the product of the fluid velocity, ''U'', and some characteristic length scale, ''α'':<br /> <br /> :&lt;math&gt;E = \alpha U.&lt;/math&gt;<br /> <br /> {{DEFAULTSORT:Dispersive Mass Transfer}}<br /> [[Category:Chemical engineering]]<br /> <br /> <br /> {{Physics-stub}}</div>

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