Dynamic Surface Effect on Single-Orifice Bubble Formation in Surfactant Solutions

• Main Authors: Hsu, Shu-Hao, 許書豪
• Other Authors: Maa Jer-Ru
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/81583140579219045541

碩士 === 國立成功大學 === 化學工程學系 === 84 === In this paper, bubble formation experiments are studied under the constantflow and the intermediate conditions using 99% pure SDS, 95% pure SDS, andTriton X-100 aqueous solutions. Equilibrium surface tensions and dynamic surfacetensions are also measured by the Wilheimy plate method and the maximum bubblepressure method, respectively, for these aqueous solutions. In addition,mixtures of 99% SDS and Triton X-100 are also studied to compare with previousresults from aqueous solutions using single surfactant. From the results of equilibrium surface tension and dynamic surface tension,we learn that Triton X-100 is the strongest, 99% SDS is the weakest, and 95% SDSis in the middle in the ability of decreasing surface tension. Nevertheless, 99%SDS is the fastest in the rate of decreasing surface tension, Triton X-100 isthe slowest, and 95% SDS is in the middle. Besides, from the experiments ofmixtures of 99% SDS and Triton X-100, we learn that the influence of synergisticeffect is not evident in this case. Under constant flow rate condition, we modified Ruff model (1972) to includedynamic surface tension effect, the predicted results show good agreement withthe experimental observations; however, the predicted results using modifiedTsuge and Hibino model (1978) (also considered the dynamic surface tension)deviates from experimental data under intermediate condition. Nevertheless, theexperimental data of surfactant solutions agree well with the predicted resultsusing the original Tsuge and Hibino model which considered the equilibriumsurface tension only.