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Research Papers

The Investigation of Semi-Three-Dimensional Heat Transfer Modeling in Microcombustors

[+] Author and Article Information
A. Fanaee

Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iran

J. A. Esfahani1

Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iranjaesfahani@gmail.com abolfazl@um.ac.ir

1

Corresponding author.

J. Thermal Sci. Eng. Appl 3(1), 011007 (Apr 04, 2011) (8 pages) doi:10.1115/1.4003660 History: Received November 09, 2010; Revised February 13, 2011; Published April 04, 2011; Online April 04, 2011

This paper presents a three-dimensional combustion model in the microcombustors. In this research, the flame structure is composed of three zones: a preheat zone, a reaction zone, and, finally, a post-flame zone. The governing equations are solved in these zones using the required boundary and matching conditions, which are achieved from nonasymptotic or asymptotic approach. Moreover, the role of Peclet number as a determining factor in the microcombustor performance is analyzed, and is found that by the increase of the Peclet number, the dimensionless flame temperature rises. Consequently, this three-dimensional model has provided a great description for the Peclet number, the dimensions, the asymptotic or nonasymptotic assumption effects, and the structural heat conduction in the microcombustors. The results are validated with those obtained from two-dimensional heat transfers modeling, and are in accordance with data published by former researchers.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

The schematic of the combustion chamber

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Figure 2

The comparison between analytical methods with experimental data (18) (heat transfer, i.e., the reaction zone is eliminated)

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Figure 3

The nonasymptotic solution for the nondimensional flame temperature in the x direction for Pe=1

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Figure 4

The nonasymptotic solution for the nondimensional flame temperature in the x direction for different Peclet numbers

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Figure 5

The asymptotic solution for the nondimensional flame temperature in the x direction for different Peclet numbers

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Figure 6

The nondimensional flame temperature in the y direction for different Peclet numbers

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Figure 7

Three nondimensional flame temperature profiles for Pe=0.01 achieved by (a) nonasymptotic analysis and (b) asymptotic analysis

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Figure 8

Three nondimensional temperature profiles achieved by nonasymptotic analysis for Pe=1 in the (a) preheat zone and (b) post-flame zone

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