SIMPLE MODEL FOR LOW INTENSITY TURBULENCE EFFECTS ON THE VAPORIZATION OF LIQUID SINGLE DROPLETS IN FORCED CONVECTIVE CONDITIONS | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 9, Volume 39, No 2, March and April 2011, Page 301-314 PDF (219.37 K) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2011.127539 | ||||
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| Author | ||||
| Maher M. Abou Al-Sood | ||||
| Dept. of Mech. Eng., Faculty of Eng., Assiut Univ., Egypt, (71516) | ||||
| Abstract | ||||
| This paper presents a semi-analytical analysis for modeling effects of moderate turbulence flows on the vaporization of an isolated fuel droplet at ambient room temperature and atmospheric pressure conditions. The turbulent Nusselt and Sherwood numbers used in this model are purely empirical. Two different hydrocarbon fuels were tested, i.e. n-heptane, and n-decane each has an initial diameter of 1.5 mm. The droplet Reynolds number, Red, is changed in the range (60–500), and turbulence intensity varied between 0 % and 11 %. The major findings of this study showed that the droplet’s vaporization rate, which is deduced from the steady-state linear variation of the droplet squared diameter, increases with increasing turbulence intensity. Also, the results from using several liquid fuels, i.e. n-hexane, n-heptane, n-octane and n-decane, show that the vaporization Damköhler number, Dav, is correlated to nondimensional turbulence evaporation rate, K/KL, by an exponential relation. Also, the applicability of this correlation at high Reynolds numbers has been studied. | ||||
| Keywords | ||||
| Droplet; Vaporization; Modeling; Turbulence; Damköhler number | ||||
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