G - Physics – 01 – N
Patent
G - Physics
01
N
73/45
G01N 13/02 (2006.01)
Patent
CA 1222881
ABSTRACT OF THE DISCLOSURE An improved apparatus and method are disclosed for measuring the dynamic surface tension at a gas-liquid interface by the maximum bubble pressure method. The gas is bubbled out an orifice tube dipped in the liquid; the maximum pressure in each bubble is a function of the surface tension. In the invention, the rate of gas flow is raised continually to increase the rate of bubbling at least several fold over a few minutes. The varying pressure of the bubbling gas is measured con- tinuously by an instantaneous transducer. Electronic circuits respond to the transducer and provide signals indicative of the maximum bubble pressure and of the rates of bubbling. A recorder responds to the signals and displays a spectrum of the maximum bubble pressure in units indicative of surface tension as a function of the bubbling rate. Measurements may be taken over more than a thousand bubbles in each spectrum. The rise in gas pressure is achieved by passing gas from a source under pressure in series through two flow-restricting capillaries, with an accumulator zone between.
471317
Smart & Biggar
The Dow Chemical Company
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