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TECHNICAL BRIEFS

A New Finite-Conductivity Droplet Evaporation Model Including Liquid Turbulence Effect

[+] Author and Article Information
M. S. Balasubramanyam

Department of Chemical and Materials Engineering, University of Alabama in Huntsville, Huntsville, Huntsville, AL 35899

C. P. Chen1

Department of Chemical and Materials Engineering, University of Alabama in Huntsville, Huntsville, Huntsville, AL 35899cchen@che.uah.edu

H. P. Trinh

 NASA-Marshall Space Flight Center, Huntsville, AL 35812

1

Corresponding author.

J. Heat Transfer 129(8), 1082-1086 (Dec 07, 2006) (5 pages) doi:10.1115/1.2737481 History: Received March 30, 2006; Revised December 07, 2006

A new approach to account for finite thermal conductivity and turbulence effects within atomizing droplets of an evaporating spray is presented in this paper. The model is an extension of the T-blob and T-TAB atomization/spray model of Trinh and Chen [Atomization and Sprays, 16 (6), pp. 907–932]. This finite conductivity model is based on the two-temperature film theory in which the turbulence characteristics of the droplet are used to estimate the effective thermal diffusivity for the liquid-side film thickness. Both one-way and two-way coupled calculations were performed to investigate the performance of this model against the published experimental data.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

History of effective film thickness within the evaporating droplet using various integration time steps

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Figure 2

Droplet temperature history comparisons using the current finite-conductivity (F-C) and the infinite-conductivity (I-C) models

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Figure 3

Comparative change in drop size for the F-C and I-C models (nonevaporating-atomization without vaporization model)

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Figure 4

Spray tip penetration with time comparisons using the current F-C model and the infinite-conductivity (I-C) model

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Figure 5

Temperature contours (X, Y direction in meters) at 4μs: (a) I-C with Blob/TAB, (b) I-C with T-blob/T-TAB, and (c) F-C with T-blob /T-TAB

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