| Citation: | LI Chaoyue, FENG Shiyu, XU Lei, et al. Measurement of mass diffusion coefficient of CO2 in RP5 jet fuel[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(3): 412-418. doi: 10.13700/j.bh.1001-5965.2020.0581(in Chinese)
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The experimental platform for measuring the gas-liquid mass diffusion coefficient is set up based on the method of digital holographic interferometry. The hollow stainless steel constant temperature diffusion tank is designed and processed and the digital image processing is coded by self-programming on MATLAB. The correctness of the experimental system is verified by measuring the mass diffusion coefficient of 0.33 mol/L KCl in water at 298.15 K. Then the mass diffusion coefficient of CO2 in RP5 jet fuel is measured in the temperature range of 278.15 K to 343.15 K under normal pressure. The mass diffusion coefficient increases with the increase of temperature. The mass diffusion coefficient at different temperatures can be fitted by Arrhenius equation model, and the relative difference between theoretical model calculation and experimental measurement results is less than 9.51%. Therefore, in practical engineering applications, the mass diffusion coefficient of CO2 in RP5 jet fuel can be accurately predicted according to the Arrhenius equation, and the experimental results provide data support for the optimal design of tank inerting system.
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