Rheology of foam
Both experimental and theoretical analyses were conducted on the rheological behavior of foam. This foam was generated by simultaneously injecting compressed air and an aqueous solution of a commercial foaming agent into a short porous medium. It then flowed into a capillary tube viscometer having 4 interchangeable glass tubes of different radii. A mathematical analysis was developed whereby both the very pronounced effects of fluid slippage at the tube wall and the foam compressibility were taken into consideration. The apparent viscosity was independent of foam quality but not of tube radius. Bubble size and bubble-size distribution were measured under a microscope, and the change of bubble size with time was studied through photomicrographs. Both the mean bubble diameter and bubble-size distribution were functions of foam quality. The cumulative size distribution as a function of a quality is represented by a modified Weibull function. Although the flowing foam behaved like a pseudoplastic fluid, the static foam had a measurable gel strength which increased with foam quality.
- Research Organization:
- Stanford Univ
- OSTI ID:
- 5666157
- Journal Information:
- ACS Symp. Ser.; (United States), Journal Name: ACS Symp. Ser.; (United States) Vol. Abstr1056-A2; ISSN ACSMC
- Country of Publication:
- United States
- Language:
- English
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