Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 136, Issue -, Pages 962-971Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2019.03.051
Keywords
Non-ideal liquid; Activity coefficients; Thermal radiation; Droplet evaporation
Categories
Funding
- National Natural Science Foundation of China [91641119]
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Currently, sophisticated fuel formulation and high temperature combustion in gas turbine and internal combustion engines make it important to investigate the effects of mixture non-ideality and radiation absorption on fuel droplet evaporation. In this study, an improved evaporation model by considering activity coefficients (AC) and external thermal radiation was established to simulate the evaporation process of multi-component non-ideal fuel droplets, and droplet suspension experiment was performed to validate the proposed model. It was found that the accuracy of simulated results was enhanced by considering activity coefficients and radiation absorption, and both effects were dependent on ambient temperature. The effect of activity coefficient was significant at low temperature (503 K), under which the droplet evaporation rate in the initial period was obviously faster than that at later stage. Consequently, the droplet lifetime decreased by about 8% at low temperature when activity coefficient was taken into consideration. At high temperature (703 K), however, the effect of activity coefficient or non-ideality on the droplet evaporation rate turned out to be insignificant. The radiation had a strong influence on evaporation at high temperature with the droplet lifetime decreasing 48% when ambient temperature increased from 503 K to 703 K. There seemed to be a critical diameter, under which the effect of radiation became negligible. It is also demonstrated that the component concentration gradients existed inside the non-ideal droplets in the initial period because of relatively low mass diffusion rate. As time elapsed, the gradients gradually disappeared due to the fact the components with large activity coefficient nearly completely evaporated. (C) 2019 Elsevier Ltd. All rights reserved.
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