| Porometry - Liquid Expulsion Method for Through-Pores | ||||||||||
| This long established method provides pore size distribution data on sheet materials that is wetted with a liquid wetting agent. We recommend our Porofil fluid that can fully wet most materials with a zero contact angle between sample surface and liquid. | ||||||||||
| When a liquid wets a material, its pores are filled due to capillary action/ An equilibrium condition exists with the force of gravity and is illustrated below. To overcome this equilibrium condition, a higher than atmospheric pressure must be applied to one end of the pores. There is a simple relationship between the pressure required to empty the pores and their size. | ||||||||||
| WSI Porometer 3G | ||||||||||
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| The WSI Porometer 3G increases the pressure on the sample in small increments and monitors the gradually increasing flow that occurs as the pores empty. The end of the "wet run" is defined as the point when all pores have been emptied. A second "dry run" is made to give a reference pressure / flow plot shown graphically below. The combined data set is used to calculate the maximum pore size (bubble Point) and the pore size distribution.
The first pore size calculation step is to determine the cumulative flow % pore distribution, which is calculated from wet flow/dry flow x 100 for each data point. Pore Number is calculated from the Hagen-Poiseuille Equation for laminar flow through a cylindrical pore using the Flow rate Q, viscosity n, and differential pressure, P through a number of pores, N of radius, r and length l. - more detail soon |
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