Droplet interaction of adiabatic dense sprays.

Autor: Lee, Suk, Kim, Hho-Jung
Zdroj: Journal of Mechanical Science & Technology; Mar1991, Vol. 5 Issue 1, p28-35, 8p
Abstrakt: The effect of the droplet interactions which arise in the interior of dense sprays is examined by considering the vaporization of a single droplet in a confined region or 'bubble'. In the present study the temporal variation of vaporization was determined at two levels of approximation, such as 'film analysis' and 'quasi-steady analysis'. Thermodynamic analysis was used to determine the final equilibrium conditions which must be satisfied by the unsteady solutions. The results of these two approximate approaches to the unsteady problem were found to be in good agreement providing support for the use of the relatively simple film theory and clearly indicated that the d-vaporization law cannot be applied in dense sprays. It was shown that the transition between complete and incomplete evaporation is very sensitive to the initial air temperature and to the ratio of the mass of the liquid to the air. In order to gain a preliminary indication of the effect of spray size distribution on the vaporization process the film analysis was extended to sprays with a bimodal droplet size distribution, and it was found that then the kinetics of vaporization also depends on the ratio of the mass of the smaller to that of the larger droplets. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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