Digital holography interferometry for measuring the mass diffusion coefficients of N2 in RP-3 and RP-5 jet fuels

Shiyu Feng (College of Aerospace Engineering, Key Laboratory of Aircraft Environment Control and Life Support of MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Chaoyue Li (College of Aerospace Engineering, Key Laboratory of Aircraft Environment Control and Life Support of MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Xiaotian Peng (College of Aerospace Engineering, Key Laboratory of Aircraft Environment Control and Life Support of MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Lei Shao (College of Aerospace Engineering, Key Laboratory of Aircraft Environment Control and Life Support of MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Weihua Liu (College of Aerospace Engineering, Key Laboratory of Aircraft Environment Control and Life Support of MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing, China)

Aircraft Engineering and Aerospace Technology

ISSN: 1748-8842

Publication date: 19 June 2019

Abstract

Purpose

The purpose of this study is to measure the mass diffusion coefficient of nitrogen in jet fuel using digital holography interferometry for cost-effective designing and modeling of the aircraft tank inerting system.

Design/methodology/approach

The mass diffusion coefficients of N2 in RP-3 and RP-5 jet fuels were measured by digital holography interferometry at temperatures ranging from 278.15 to 343.15 K. The Arrhenius equation is used to adequately describe the relationship between mass diffusion coefficients and temperature. The viscosities of RP-3 and RP-5 jet fuels were also measured to examine the accuracy of the Stokes–Einstein model in calculating mass diffusion coefficients.

Findings

As temperature increases from 278.15 to 343.15 K, the mass diffusion coefficients increase 4.23-fold for N2 in RP-3 jet fuel and 5.13-fold for N2 in RP-5 jet fuel. The value of Dµ/T is not constant as the Stokes–Einstein equation expressed, but is a weak linear function of temperature.

Practical implications

A more accurate diffusion model is proposed by fitting the measured Dµ/T with the temperature and calculating the mass diffusion coefficients of N2 in RP-3 and RP-5 jet fuels within 10 per cent relative deviation.

Originality/value

A measurement system for mass diffusion coefficients of N2 in RP-3 and RP-5 jet fuels was constructed based on the digital holography interferometry. The mass diffusion coefficient can be expressed by a uniform polynomial function of temperature and viscosity.

Keywords

Citation

Feng, S., Li, C., Peng, X., Shao, L. and Liu, W. (2019), "Digital holography interferometry for measuring the mass diffusion coefficients of N2 in RP-3 and RP-5 jet fuels", Aircraft Engineering and Aerospace Technology, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/AEAT-05-2018-0152

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Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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