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1 2018

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Numerical investigation of heat transfer in fuel-water emulsion droplet

Rodzewicz R., Gieras M.

Archivum Combustionis

2018

Vol. 38 nr 1

1--10

This paper aims to iiwestigate heat flow in fuel/water emulsion droplet using ANSYS Fluent code. A model was tested under different boundary conditions including various flow temperatures, velocities, droplet sizes, water contents, etc. The rate of a temperaturę increment was monitored inside dispersed phase droplets. The obtained results were compared to find out in which case boiling point was reached in all water droplets simultaneously. Such a temperaturę distribution is suspected to be the main condition for microexplosion occurrence. However, this should be confirmed experimentally. Simulations show that a higher temperaturę and a smaller droplet diameter may promote microexplosion. Also it appears that there exists an optimal flow velocity, when the difference of time of reaching boiling point for every water droplet is the smallest. The minor, but a very interesting observation concerns a negligible impact of water presence on heat distribution. It has been shown that treating an emulsion droplet as a continuum with an averaged specific heat of water and oil may result in an error less than 1%. It is an useful conclusion that enables the analytical approach to the problem. The obtained results provide a solid basis for further experimental research.