Measurement of surface tension and viscosity by open capillary t

Details Measurement of surface tension and viscosity by open capillary t Measurement of surface tension and viscosity by open capillary t

1996-10-08

1998-08-11

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

73 6448, G01N 1100, G01N 1300

Patent

active

057929416

ABSTRACT:
An open-channel capillary is provided, having preferably a v-shaped groove in a flat wettable surface. The groove has timing marks and a source marker in which the specimen to be tested is deposited. The time of passage between the timing marks is recorded, and the ratio of surface tension .gamma. to viscosity .mu. is determined from the equation given below: ##EQU1## where h.sub.0 is the groove depth, .alpha. is the groove angle, .theta. is the liquid/solid contact angle, and t is the flow time. It has been shown by the inventors that the kinetics are only at most a weak function of K(.alpha.,.theta.); moreover, a wide range of theoretical assumptions show comparable numerical values for K(.alpha.,.theta.). .gamma..div..mu. and h.sub.0 are the only parameters. With the depth of the groove being an experimentally controllable parameter, the ratio of .gamma..div..mu. is the only free parameter. The value of .gamma..div..mu. can be determined from plots of z.sup.2 v. t by taking the slope of the curve for measured value of h.sub.0.

REFERENCES:
patent: H337 (1987-10-01), Matta
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patent: 4534211 (1985-08-01), Molina
patent: 5200248 (1993-04-01), Thompson et al.
patent: 5491642 (1996-02-01), Wormell et al.

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