【摘要】 依据孔隙介质中的弹性波理论，以 Ｃ Ｏ２ 气体为对象，研究了无介质和有孔隙介质两种情况下气体相态转变的超声波测试新方法。结果表明：超声波声速和衰减对 Ｃ Ｏ２ 气体相变敏感；而孔隙介质可能一定程度地影响了 Ｃ Ｏ２ 气体的相行为，既改变其饱和蒸汽压，也减缓其相变的突变程度。这种超声波方法有望进一步发展为研究孔隙介质中凝析气相行为的新测试技术。更多还原

【Abstract】 Based on the Boit theory on acoustic propagation in porous media, ultrasonic method to determine the saturation vapor pressure of CO 2 has been investigated . As a result the speed and the attenuation of ultrasonic wave are very sensitive to the phase transitions of CO 2 in a PV cylinder both with and without porous media. Moreover it is indicated that porous media might affected the saturation vapor pressure of CO 2 to some extent.更多还原