A Liquid-Pool Simulation of Droplet Combustion in a Swirl Flow

S. S. Hou, Ta-Hui Lin

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The influence of flow rotation on droplet combustion and evaporation are experimentally studied by using a burning liquid-pool system, and numerically investigated by considering a nonreactive, rotating, stagnation-point flow, respectively. The experiment involves measurements of flame temperature, flame position and evaporation rate of the liquid pool, observations of the recirculation zone and the soot layer, and identification of flame extinction. A finite-volume method is employed to numerically solve the corresponding transport equations. Calculated results show that in the vicinity of the liquid surface, both convection and diffusion transports are weakened by the flow rotation, resulting in the suppression of the evaporation strength of liquid; the recirculation zone can be identified and compared with experimental observation. For the steady burning of an ethanol pool in a swirling air jet, it is found that as the angular velocity increases, the diffusion flame shifts closer to the upper burner, has a larger flame thickness, experiences a smaller flame stretch, but suffers from the reduction of mass diffusion of ethanol vapor to the flame. However, the evaporation rate of ethanol is usually decreased with increasing angular velocity. In the flame extinction experiment, the critical volumetric oxygen concentration at extinction first decreases to a minimum value and then increases with angular velocity. It is generally concluded that flow rotation reduces the rates of both droplet combustion and evaporation.

Original languageEnglish
Pages (from-to)175-182
Number of pages8
JournalJournal of Energy Resources Technology, Transactions of the ASME
Volume115
Issue number3
DOIs
Publication statusPublished - 1993 Jan 1

Fingerprint

droplet
Evaporation
evaporation
combustion
Angular velocity
liquid
Liquids
ethanol
Ethanol
extinction
simulation
Soot
finite volume method
Finite volume method
soot
Fuel burners
experiment
convection
Experiments
Vapors

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Geochemistry and Petrology

Cite this

@article{9d4ebc81b34c4b9182620272ba74ba45,
title = "A Liquid-Pool Simulation of Droplet Combustion in a Swirl Flow",
abstract = "The influence of flow rotation on droplet combustion and evaporation are experimentally studied by using a burning liquid-pool system, and numerically investigated by considering a nonreactive, rotating, stagnation-point flow, respectively. The experiment involves measurements of flame temperature, flame position and evaporation rate of the liquid pool, observations of the recirculation zone and the soot layer, and identification of flame extinction. A finite-volume method is employed to numerically solve the corresponding transport equations. Calculated results show that in the vicinity of the liquid surface, both convection and diffusion transports are weakened by the flow rotation, resulting in the suppression of the evaporation strength of liquid; the recirculation zone can be identified and compared with experimental observation. For the steady burning of an ethanol pool in a swirling air jet, it is found that as the angular velocity increases, the diffusion flame shifts closer to the upper burner, has a larger flame thickness, experiences a smaller flame stretch, but suffers from the reduction of mass diffusion of ethanol vapor to the flame. However, the evaporation rate of ethanol is usually decreased with increasing angular velocity. In the flame extinction experiment, the critical volumetric oxygen concentration at extinction first decreases to a minimum value and then increases with angular velocity. It is generally concluded that flow rotation reduces the rates of both droplet combustion and evaporation.",
author = "Hou, {S. S.} and Ta-Hui Lin",
year = "1993",
month = "1",
day = "1",
doi = "10.1115/1.2905990",
language = "English",
volume = "115",
pages = "175--182",
journal = "Journal of Energy Resources Technology, Transactions of the ASME",
issn = "0195-0738",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "3",

}

A Liquid-Pool Simulation of Droplet Combustion in a Swirl Flow. / Hou, S. S.; Lin, Ta-Hui.

In: Journal of Energy Resources Technology, Transactions of the ASME, Vol. 115, No. 3, 01.01.1993, p. 175-182.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A Liquid-Pool Simulation of Droplet Combustion in a Swirl Flow

AU - Hou, S. S.

AU - Lin, Ta-Hui

PY - 1993/1/1

Y1 - 1993/1/1

N2 - The influence of flow rotation on droplet combustion and evaporation are experimentally studied by using a burning liquid-pool system, and numerically investigated by considering a nonreactive, rotating, stagnation-point flow, respectively. The experiment involves measurements of flame temperature, flame position and evaporation rate of the liquid pool, observations of the recirculation zone and the soot layer, and identification of flame extinction. A finite-volume method is employed to numerically solve the corresponding transport equations. Calculated results show that in the vicinity of the liquid surface, both convection and diffusion transports are weakened by the flow rotation, resulting in the suppression of the evaporation strength of liquid; the recirculation zone can be identified and compared with experimental observation. For the steady burning of an ethanol pool in a swirling air jet, it is found that as the angular velocity increases, the diffusion flame shifts closer to the upper burner, has a larger flame thickness, experiences a smaller flame stretch, but suffers from the reduction of mass diffusion of ethanol vapor to the flame. However, the evaporation rate of ethanol is usually decreased with increasing angular velocity. In the flame extinction experiment, the critical volumetric oxygen concentration at extinction first decreases to a minimum value and then increases with angular velocity. It is generally concluded that flow rotation reduces the rates of both droplet combustion and evaporation.

AB - The influence of flow rotation on droplet combustion and evaporation are experimentally studied by using a burning liquid-pool system, and numerically investigated by considering a nonreactive, rotating, stagnation-point flow, respectively. The experiment involves measurements of flame temperature, flame position and evaporation rate of the liquid pool, observations of the recirculation zone and the soot layer, and identification of flame extinction. A finite-volume method is employed to numerically solve the corresponding transport equations. Calculated results show that in the vicinity of the liquid surface, both convection and diffusion transports are weakened by the flow rotation, resulting in the suppression of the evaporation strength of liquid; the recirculation zone can be identified and compared with experimental observation. For the steady burning of an ethanol pool in a swirling air jet, it is found that as the angular velocity increases, the diffusion flame shifts closer to the upper burner, has a larger flame thickness, experiences a smaller flame stretch, but suffers from the reduction of mass diffusion of ethanol vapor to the flame. However, the evaporation rate of ethanol is usually decreased with increasing angular velocity. In the flame extinction experiment, the critical volumetric oxygen concentration at extinction first decreases to a minimum value and then increases with angular velocity. It is generally concluded that flow rotation reduces the rates of both droplet combustion and evaporation.

UR - http://www.scopus.com/inward/record.url?scp=0027662968&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027662968&partnerID=8YFLogxK

U2 - 10.1115/1.2905990

DO - 10.1115/1.2905990

M3 - Article

VL - 115

SP - 175

EP - 182

JO - Journal of Energy Resources Technology, Transactions of the ASME

JF - Journal of Energy Resources Technology, Transactions of the ASME

SN - 0195-0738

IS - 3

ER -