流体振荡对纯液体气液相平衡压力的影响

Influence of liquid oscillation on the gas-liquid equilibrium pressure

通过恒温水浴振荡器使液体(乙醇、异丙醇和水)产生振荡,以此研究在振荡条件下气液相平衡压力与饱和蒸汽压的偏离程度。结果表明:流体的振荡使气液相平衡压力与其饱和蒸汽压发生了明显的偏移,且偏移程度随振荡时间的增加而增大,3 min左右趋于稳定;振荡频率越大、温度越高偏移程度越大,在温度35℃和振荡频率210 min-1的条件下,乙醇最大偏移程度为14.5%。

The gas-liquid equilibrium pressures of ethanol, isopropanol and water were studied in order to investi- gate their deviations from saturation pressures. By means of an oscillator, liquid was forced to oscillate with a cer- tain frequency. The pressure above the liquid level increased and stopped rising within about 3 minutes. The results showed that the pressure of the gas was higher than its saturation pressure. The deviation increased with increasing frequency or increasing temperature. At a temperature of 35℃ and an oscillation frequency of 210 min-1, the maxi- mum deviation of the pressure of ethanol was 14.5%.