The effect of non-luminous thermal radiation on suspended (constant relative velocity) methanol droplet combustion in a low temperature (300 K) and low pressure (1 atm) environment is discussed in detail. Numerical results are obtained using a predictive, transient, two-phase, axisymmetric numerical model that includes surface tension effects. Radiation is modeled using the optically thin approximation with the product species CO2 and H2O as the radiating species. Results for combustion in a quiescent atmosphere (initial Reynolds number 0.01) and initial droplet diameters in the range of 0.43 mm to 3 mm are presented. The results show that the effect of flame radiation is negligible when the initial droplet diameter is less than approximately 1 mm and becomes increasingly important for droplets with initial diameters greater than approximately 1 mm, as reported in previous literature. The average evaporation constant decreases with the initial droplet diameter. Both radiation and surface tension have a significant effect on the predicted extinction diameters of initially larger droplets. The extinction diameter presents a non-linear variation with the initial droplet diameter for initially larger droplets and agreement with experiments is good.
|Original language||English (US)|
|Title of host publication||Energy Systems|
|Subtitle of host publication||Analysis, Thermodynamics and Sustainability|
|Publisher||American Society of Mechanical Engineers (ASME)|
|Number of pages||10|
|State||Published - 2007|
|Event||ASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007 - Seattle, United States|
Duration: Nov 11 2007 → Nov 15 2007
|Name||ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)|
|Other||ASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007|
|Period||11/11/07 → 11/15/07|
Bibliographical notePublisher Copyright:
Copyright © 2007 by ASME.