Numerical investigation of aerodynamic droplet breakup in a high temperature gas environment

FUEL

卷:181

Article

Strotos, George¹  Malgarinos, Ilias¹  Nikolopoulos, Nikos¹  Gavaises, Manolis¹ 

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

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

DOI  :  10.1016/j.fuel.2016.04.126

来源: Elsevier

【 摘 要 】

The Navier-Stokes equations, energy and vapor transport equations coupled with the VOF methodology and a vaporization rate model are numerically solved to predict aerodynamic droplet breakup in a high temperature gas environment. The numerical model accounts for variable properties and uses an adaptive local grid refinement technique on the gas-liquid interface to enhance the accuracy of the computations. The parameters examined include Weber (We) numbers in the range 15-90 and gas phase temperatures in the range 400-1000 K for a volatile n-heptane droplet. Initially isothermal flow conditions are examined in order to assess the effect of Weber (We) and Reynolds (Re) number. The latter was altered by varying the gas phase properties in the aforementioned temperature range. It is verified that the We number is the controlling parameter, while the Re number affects the droplet breakup at low We number conditions. The inclusion of droplet heating and evaporation mechanisms has revealed that heating effects have generally a small impact on the phenomenon due to its short duration except for low We number cases. Droplet deformation enhances heat transfer and droplet evaporation. An improved 0-D model is proposed, able to predict the droplet heating and vaporization of highly deformed droplets. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free