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| 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.
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| <math>S = \frac{C_r}{C_d}</math>
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| where
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| * ''S'' is the sieving coefficient
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| * ''C''<sub>r</sub> is the mean concentration mass receiving stream
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| * ''C''<sub>d</sub> is the mean concentration mass donating stream
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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]].
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| Sieving coefficients less than one represent a mass transfer process where the concentrations have not equilibrated.
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| Contact time between mass streams in important in consider in mass transfer and affects the sieving coefficient.
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| ==In kidney==
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| In [[renal physiology]], the sieving coefficient can be expressed as:
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| 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>
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| ==See also== | |
| *[[Heat exchanger]]
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| *[[Condenser pinch point]]
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| *[[Sieve]]
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| ==References==
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| <references />
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| [[Category:Transport phenomena]]
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| [[Category:Chemical engineering]]
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| [[Category:Mechanical engineering]]
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Latest revision as of 01:18, 12 November 2014
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