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Technical Briefs

Numerical Modeling of Steady Burning Characteristics of Spherical Ethanol Particles in a Spray Environment

[+] Author and Article Information
Vaibhav Kumar Sahu

Department of Mechanical Engineering, IIT Madras, Chennai, Indiaraghavan@iitm.ac.in

Vasudevan Raghavan1

Department of Mechanical Engineering, IIT Madras, Chennai, Indiaraghavan@iitm.ac.in

Daniel N. Pope

Department of Mechanical Engineering,  University of Minnesota, Duluth, MN 55812

George Gogos

Department of Mechanical Engineering,  University of Nebraska, Lincoln, NE 68588

1

Corresponding author.

J. Heat Transfer 133(9), 094502 (Aug 01, 2011) (6 pages) doi:10.1115/1.4003905 History: Received January 14, 2011; Accepted March 25, 2011; Revised March 25, 2011; Published August 01, 2011; Online August 01, 2011

A numerical study of steady burning of spherical ethanol particles in a spray environment is presented. A spray environment is modeled as a high temperature oxidizer stream where the major products of combustion such as carbon dioxide and water vapor will be present along with reduced amounts of oxygen and nitrogen. The numerical model, which employs variable thermophysical properties, a global single-step reaction mechanism, and an optically thin radiation model, has been first validated against published experimental results for quasi-steady combustion of spherical ethanol particles. The validated model has been employed to predict the burning behavior of the ethanol particle in high temperature modified oxidizer environment. Results show that based on the amount of oxygen present in the oxidizer the burning rate constant is affected. The ambient temperature affects the burning rate constant only after a sufficient decrease in the oxygen content occurs. In pure air stream, ambient temperature variation does not affect the evaporation constant. Results in terms of burning rates, maximum temperature around the particle, and the evaporation rate constants are presented for all the cases. The variation of normalized Damköhler number is also presented to show the cases where combustion or pure evaporation would occur.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Computational domain

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Figure 2

Variation of nondimensional mass burning rate as a function of square root of effective Reynolds number; symbols show the numerical prediction and solid line shows the experimental correlation reported in Parag and Raghavan [7]

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Figure 3

Temperature contours in the region near the sphere for different ambient temperature cases; oxidizer stream is standard air with oxygen mass fraction of 0.232

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Figure 4

Temperature contours in the region near the sphere for different φ values at an ambient temperature of 1000 K

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Figure 5

Variation of maximum temperature around the particle (a) and the burning rate constant (b) as a function of equivalence ratio and ambient temperatures

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Figure 6

Variation of normalized Damköhler number as a function of equivalence ratio and ambient temperatures

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