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Atomization and Sprays
CANONICAL REACTING FLUID DYNAMICS ANALYSIS OF DROPLET VAPORIZATION AND COMBUSTION
Department of Mechanical Engineering, Technology and Science Institute of Northern Taiwan, Taipei, Taiwan, 112, R.O.C.
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan,70101, ROC
Canonical reacting fluid dynamics analysis is applied to examine six different mechanisms of quasi-steady gasification of a droplet under axial symmetric flows. The Spalding conduction law and convective enhancement are assessed as two major submechanisms of droplet vaporization, which follows the rule of basic gasification partition, 0 ≤ mi⁄m ≤ 1. It is remarkably interesting to note that the Spalding mechanism and convective effects in a burning droplet may give negative gasification in some range of Reynolds numbers, whereas the chemical reaction makes a positive contribution. The maps of gasification source distribution, uniquely constructed from the canonical procedure enabled us, for the first time, to predict and understand the basic aerothermochemical mechanisms of these gasification processes, their dependence on overall flow structure, and the flame topology in a broad range of Reynolds numbers. The heat deliverability index, ξ, which measures net heat transported to the gaseous environment to the heat supplied for droplet gasification, is introduced to assess the energy provided to heating the gas phase.
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