Study on the effect of temperature on the gas–liquid mass transfer rate of volatile liquid
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China
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Accepted: 12 May 2020
Published online: 27 May 2020
The high volatility liquids in industrial production are easily vaporized and diffuses into the workplace, posing a hazard. The volatility liquid gas–liquid mass transfer rate is calculated based on the mass loss measured in experiments. In this paper, the relation between the gas–liquid mass transfer rate and the liquid temperature and air flow rate above the liquid is analysed. Based on the gas–liquid mass transfer rate model proposed by Donald Mackay, combined with Maxwell’s rate distribution law, a new temperature correction term was proposed to correct Mackay’s gas–liquid mass transfer theory. The results show that the higher the liquid temperature of n-pentane is, the higher the air flow rate above the liquid surface and the higher the gas–liquid mass transfer rate are. According to the experimental results, the temperature correction term coefficient is 0.560, and the variance is 0.011. A corrected gas–liquid mass transfer rate calculation model is obtained. Vertical flow liquid column gas–liquid transfer experiments are conducted, and the temperature and temperature change before and after the experiments are obtained for liquid columns of different diameters. The difference between the new model calculation results and the experimental values is no more than 4.20%. The model error of the gas–liquid mass transfer rate calculation model after temperature correction is small.
The mass loss of the n-pentane liquid pool in the air passage was measured by experiment, and the gas–liquid mass transfer rate was obtained. The influence of temperature on mass transfer rate is proposed. Combined with Mackay’s gas–liquid mass transfer theory, a new gas–liquid mass transfer rate calculation method is obtained, and its correctness is verified by experiments.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020