不同相态CO_2形成的泡沫体系性能研究

Performance of Foam System Composed of Different Phases of CO_2

CO2具有气态、液态和超临界态3种不同的相态,不同相态CO2产生的泡沫外观和稳定性差异较大。通过高温高压可视化泡沫仪研究了气态、液态和超临界态下CO2泡沫性能。试验结果表明,超临界态CO2形成的泡沫形态介于气态CO2形成的泡沫和液态CO2形成的乳状液之间。随着温度升高,CO2泡沫的起泡体积、半衰期降低;随着压力增加,特别是在超临界态条件下,CO2泡沫的起泡能力和稳泡能力都明显增加。在泡沫封堵试验中,超临界态CO2形成的泡沫阻力因子高于气态和液态CO2形成的泡沫体系。

CO2had three different states such as gaseous,liquid and supercritical states,the exterior feature and stability were different for foam produced by different phases of CO2.Via high temperature and high pressure foam instrument the gaseous,liquid and supercritical states of CO2foam were studied.Experimental results show that the shape of foam formed by supercritical CO2is between the emulsion of gaseous CO2and liquid CO2.With the increase of temperature, its foaming volume and semi-attenuation period reduce.With the increase of pressure,its foaming ability and foam stability are obviously raised especially under supercritical condition.In foam sealing experiment,the drag coefficient of foam created by supercritical CO2is higher than that of gaseous and liquid CO2.