Sieving coefficient

In mass transfer, the sieving coefficient is a measure of equilibration between the concentrations 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.

where

  • S is the sieving coefficient
  • Cr is the mean concentration mass receiving stream
  • Cd is the mean concentration mass donating stream

A sieving coefficient of unity implies that the concentrations of the receiving and donating stream equilibrate, i.e. the out-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.

Sieving coefficients less than one represent a mass transfer process where the concentrations have not equilibrated.

Contact time between mass streams is important in consider in mass transfer and affects the sieving coefficient.

In kidney

In renal physiology, the glomerular sieving coefficient (GSC) can be expressed as: sieving coefficient = clearance / ultrafiltration rate[1]

gollark: If one country sells 10 million employment, their unemployment goes up by 10 million and whoever buys it has a 10 million reduction in unemployment.
gollark: This wouldn't involve anyone actually working anywhere else...
gollark: Just sell "employment", in a totally abstract sense.
gollark: No, I don't mean sell actual *people*.
gollark: Or if countries could sell employment, just in the abstract, if they have an excess of it, so other countries can boost their statistics.

See also

References
  1. Sieving coefficient in drug clearance - cuhk.edu.hk
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.