The interaction between external and internal heat losses on the flame extinction of dilute sprays

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Combustion and Flame; (United States)

OSTI ID:5899804

Lui, C C; Hui Lin, T ^[1]

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1. Dept. of Mechanical Engineering, National Cheng Kung Univ., Tainan 70101 (TW)

In this paper the flame extinction of a dilute spray burning in a steady, one-dimensional, low-speed, sufficiently off-stoichiometric, two-phase flow, is studied using activation energy asymptotics. A completely prevaporized burning and a partially prevaporized burning of spray are identified on the basis of a critical value of the initial droplet radius for completing the vaporization process at the flame. The heat loss mechanism is composed of the external heat loss represented by the buck heat conduction from the system to the surrounding, and the internal heat loss associated with the droplet gasification process. The interaction between external and internal heat losses on the flame extinction of dilute sprays is generally discussed on the basis of three parameters, namely the external heat loss, the initial droplet radius, and the liquid fuel loading.

• OSTI ID: 5899804
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 85:3; ISSN 0010-2180; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ACTIVATION ENERGY
ASYMPTOTIC SOLUTIONS
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
DEPOSITION
DROPLETS
ENERGY
ENERGY LOSSES
ENTHALPY
FLAME PROPAGATION
FLAME SPRAYING
FLAMES
FLUID FLOW
FUELS
GASIFICATION
HEAT LOSSES
INHIBITION
KINETICS
LIQUID FUELS
LOSSES
PARTICLES
PHYSICAL PROPERTIES
REACTION KINETICS
SPRAY COATING
SURFACE COATING
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
TWO-PHASE FLOW
VAPORIZATION HEAT