Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Vapor pressure
Patent
1989-11-15
1990-11-20
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Vapor pressure
G01N 1302
Patent
active
049708929
ABSTRACT:
A method and apparatus for determining if a surfactant will keep a narrow passageway open. The apparatus includes a glass tube having first and second end portions and an intermediate necked-down portion including a relatively narrow center and tapered first and second sections to either side of the relatively narrow center. In accordance with the method, a small quantity of fluid, for example one microliter, is placed within the necked-down portion to form a column of fluid. A pressure transducer is associated with a closed portion of the tube to one side of the column. The column of fluid is then slowly forced through the necked-down portion and the pressure is recorded. By continuing the process even after the column of fluid has passed the necked-down portion, it is possible to determine whether or not the fluid will adhere to the surface of the glass tube or re-form into a column of liquid. If the later happens, it is also possible to determine the surface tension of the fluid.
REFERENCES:
patent: 2054438 (1936-09-01), Natelson
patent: 3854324 (1974-12-01), Altshuler et al.
Roskos Joseph W.
Williams Hezron E.
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