Rapid Vaporization and Heating of Two Parallel Fuel Droplet Streams

Abstract

An analysis is presented of the mechanisms of heat transfer and vaporization in an idealized two-dimensional fuel spray consisting of two parallel droplet streams injected in a hot gas. With the assumption of a constant relative velocity between the gas and liquid phases (inviscid approximation), a system of partial differential equations with linear operators and non-linear source terms is obtained. With the use of Green's functions, this system is transformed into a group of non-linear ordinary differential equations and integral equations which are readily solved with numerical techniques. The dimensionless groups influencing the problem are identified and a discussion is presented of the effects of four relevant parameters including: a vaporization- diffusion time ratio, a liquid-gas mass flow ratio, a Spalding transfer number, and a Reynolds number. The method yields qualitatively correct estimates of the behavior of the gas and liquid phases which may serve as guidelines in the development of costlier numerical schemes. Keywords: Spray; Combustion; Ignition; Flames; Propagation.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1986
Accession Number
ADA180842

Entities

People

  • R. H. Rangel
  • William A. Sirignano

Organizations

  • University of California, Irvine

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Reactions
  • Differential Equations
  • Equations
  • Flow
  • Heat Energy
  • Heat Of Vaporization
  • Heat Transfer
  • Integral Equations
  • Latent Heat
  • Liquid Phases
  • Mass Flow
  • Partial Differential Equations
  • Payload
  • Physical Properties
  • Reynolds Number
  • Two Dimensional
  • Vaporization

Readers

  • Combustion science or combustion engineering.
  • Fluid Dynamics.
  • Systems Analysis and Design