Aerodynamic breakup of an n-decane droplet in a high temperature gas environment

FUEL

卷:185

Article

Strotos, George^1,2  Malgarinos, Ilias¹  Nikolopoulos, Nikos^1,3  Gavaises, Manolis¹ 

[1] City Univ London, Sch Engn & Math Sci, Northampton Sq, London EC1V 0HB, England

[2] Technol Educ Inst Piraeus, Dept Mech Engn, Fluid Mech Lab, 250 Thivon & P Ralli Str, Aigaleo 12244, Greece

[3] Chem Proc & Energy Resources Inst CERTH CPERI, Ctr Res & Technol Hellas, Egialeias 52, Maroussi, Greece

关键词: Droplet breakup;    VOF;    Heating;    Evaporation;   

DOI  :  10.1016/j.fuel.2016.08.014

来源: Elsevier

【 摘 要 】

The aerodynamic droplet breakup under the influence of heating and evaporation is studied numerically by solving the Navier-Stokes, energy and transport of species conservation equations; the VOF methodology is utilized in order to capture the liquid-air interphase. The conditions examined refer to an n-decane droplet with Weber numbers in the range 15-90 and gas phase temperatures in the range 600-1000 K at atmospheric pressure. To assess the effect of heating, the same cases are also examined under isothermal conditions and assuming constant physical properties of the liquid and surrounding air. Under non-isothermal conditions, the surface tension coefficient decreases due to the droplet heat-up and promotes breakup. This is more evident for the cases of lower Weber number and higher gas phase temperature. The present results are also compared against previously published ones for a more volatile n-heptane droplet and reveal that fuels with a lower volatility are more prone to breakup. A 0-D model accounting for the temporal variation of the heat/mass transfer numbers is proposed, able to predict with sufficient accuracy the thermal behavior of the deformed droplet. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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