Method and apparatus for reduction of gas bubble formation due to gas diffusion through liquids contained in pores

Patent No. 6,789,410

Issued: September 14, 2004

Inventor: Gupta; Krishna M. (12 Grandview Dr., Ithaca, NY 14850); Smiricinschi; Valeriu (316 Highland Rd. Apt B204, Ithaca, NY 14850)

A porosimeter includes a pressurizable sample chamber with a membrane located directly below the sample. The membrane pores have a smaller size than any of the sample pores of interest. A fluid reservoir is located below the membrane such that the reservoir and the membrane form a seal. In operation, as fluid enters the fluid reservoir through the membrane or a reservoir inlet, fluid already in the fluid reservoir is displaced through a reservoir exit. An inlet in a fluid displacement reservoir receives the fluid displaced from the fluid reservoir. A recirculation line receives fluid from the exit of the fluid displacement reservoir and circulates the fluid into the inlet of the fluid reservoir. In a preferred embodiment, a pump recirculates the fluid through the recirculation line. Fluid returned to the reservoir circulates over the bottom of the membrane, and sweeps air bubbles out of the reservoir.

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