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<div>In [[mass transfer]], the '''sieving [[coefficient]]''' is a measure of [[Mass transfer|equilibration]] between the [[concentration]]s of two mass transfer streams. It is defined as the [[mean]] pre- and post-contact concentration of the mass receiving stream divided by the pre- and post-contact concentration of the mass donating stream.<br />
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<math>S = \frac{C_r}{C_d}</math><br />
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where<br />
* ''S'' is the sieving coefficient<br />
* ''C''<sub>r</sub> is the mean concentration mass receiving stream<br />
* ''C''<sub>d</sub> is the mean concentration mass donating stream<br />
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A sieving coefficient of [[1 (number)|unity]] implies that the concentrations of the receiving and donating stream equilibrate, i.e. the out-[[mass flow rate|flow]] concentrations (post-mass transfer) of the mass donating and receiving stream are equal to one another. Systems with sieving coefficient that are greater than one require an external [[energy]] source, as they would otherwise violate the [[laws of thermodynamics]]. <br />
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Sieving coefficients less than one represent a mass transfer process where the concentrations have not equilibrated. <br />
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Contact time between mass streams in important in consider in mass transfer and affects the sieving coefficient.<br />
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==In kidney==<br />
In [[renal physiology]], the sieving coefficient can be expressed as:<br />
sieving coefficient = [[renal clearance|clearance]] / [[ultrafiltration rate]]<ref>[http://www.aic.cuhk.edu.hk/web8/Renal%20replacement%20therapy%20-%20CVVH.htm Sieving coefficient in drug clearance] - cuhk.edu.hk</ref><br />
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==See also==<br />
*[[Heat exchanger]]<br />
*[[Condenser pinch point]]<br />
*[[Sieve]]<br />
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==References==<br />
<references /><br />
<br />
[[Category:Transport phenomena]]<br />
[[Category:Chemical engineering]]<br />
[[Category:Mechanical engineering]]</div>128.252.20.193