Unsteady Effects in Droplet Vaporization Lifetimes at Subcritical and Supercritical Conditions
作者:
MANUEL ARIAS-ZUGASTI,
PEDROL. GARCÍA-YBARRA,
JOSEL. CASTILLO,
期刊:
Combustion Science and Technology
(Taylor Available online 2000)
卷期:
Volume 153,
issue 1
页码: 179-191
ISSN:0010-2202
年代: 2000
DOI:10.1080/00102200008947259
出版商: Taylor & Francis Group
关键词: Supercritical Combustion;Droplet Vaporization;Sprays
数据来源: Taylor
摘要:
The heating and vaporization of a pure cold fluid package in a hot environment of the same fluid has been analyzed. The model applies to subcritical as well as supercritical fluid conditions and relics on the assumption of constant pressure and quasisteady conditions in the gas phase (in a reference system receding with the cold front). An asymptotic analysis is performed using the ratio of the hot fluid density to the density of the cold fluid package as the smallness parameter. Then, a transcendental equation is obtained which provides the evolution of the cold package radius. For longer times when isothermal conditions are achieved in the cold region, the d2law is obtained. Some deviations from this law. due to the unsteadiness of the heating process in the cold region, are evaluated and discussed.
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