Method and apparatus for measuring porosity using a surface-temp

Details Method and apparatus for measuring porosity using a surface-temp Method and apparatus for measuring porosity using a surface-temp

1974-05-23

1976-02-24

Ruehl, Charles A.

Measuring and testing

Moisture content or absorption characteristic of material

73 154, G01N 1508

Patent

active

039396983

ABSTRACT:
A method and apparatus for measuring the porosity or density of a porous structure surface is disclosed. A controlled quantity of volatile liquid is applied to a porous surface and is allowed to evaporate. The temperature at the surface reaches equilibrium at the point necessary to supply the latent heat of vaporization of the liquid. This equilibrium temperature depends on the evaporation rate, which has been found to be a function of surface porosity. The porosimeter substantially eliminates other factors influencing evaporation rate, and measures and records the temperature at the surface. Once calibrated with samples of known porosity, this system is capable of making rapid, accurate surface porosity measurements.

REFERENCES:
patent: 2477526 (1949-07-01), Perley
patent: 3712110 (1973-01-01), Paulik et al.
patent: 3733893 (1973-05-01), Bickford et al.
Hirst, et al., "A Calorimeter for the Measurement of Small Amounts of Heat Liberated Slowly", Scientific Instruments, Vol. 27, June 1950 pp. 161-163.
Kazanskii, et al., "Determination of the Specific Heat of Evaporation of a Liquid from Dispersed Solids in a Wide Temperature Range", J. Engineering Physics, Vol. 11, No. 5, Nov. 1966, pp. 328-332.

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