Accession Number:

ADA000542

Title:

Unsteady Effects in Droplet Evaporation and Combustion.

Descriptive Note:

Interim rept. 1 Jun 72-31 Dec 73,

Corporate Author:

INSTITUTO NACIONAL DE TECNICA AEROESPACIAL MADRID (SPAIN)

Personal Author(s):

Report Date:

1974-06-27

Pagination or Media Count:

37.0

Abstract:

An asymptotic analysis is presented for the problem of droplet vaporization in a stagnant atmosphere taking into account the unsteady effects in the gas phase. The ratio of the densities of the ambient gas and of the liquid is considered as a small parameter. The results of the classical quasi-steady theories are recovered in the first approximation, and corrections due to unsteady effects are obtained for the vaporization rate and for the droplet lifetime. The analysis is entended to cover the cases when the vaporization rate is enhanced by a fast irreversible reaction between the fuel vapor and an oxidizer in the ambient gas. The ratio of flame radius to droplet radius is found in many practical cases to vary significantly with time in agreement with experimental results. Modified author abstract

Subject Categories:

  • Physical Chemistry
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE