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Technical Brief

Lower Dimensional Model for Modeling the Heat Transfer and Detailed Reactions Inside Long Channels

[+] Author and Article Information
Rakesh Yadav

ANSYS, Inc.,
San Diego, CA 92121
e-mail: Rakesh.yadav@ansys.com

Ellen Meeks

ANSYS, Inc.,
San Diego, CA 92121
e-mail: Ellen.meeks@ansys.com

Graham Goldin

ANSYS, Inc.,
Lebanon, NH 03766

Stefano Orsino

ANSYS, Inc.,
Lebanon, NH 03766
e-mail: stefano.orsino@ansys.com

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received January 11, 2014; final manuscript received December 23, 2015; published online September 27, 2016. Assoc. Editor: John C. Chai.

J. Thermal Sci. Eng. Appl 9(1), 014501 (Sep 27, 2016) (4 pages) Paper No: TSEA-14-1009; doi: 10.1115/1.4032606 History: Received January 11, 2014; Revised December 23, 2015

A methodology has been developed for coupling the one-dimensional (1D) solution of flow inside the nonpermeable channels with the 3D outer flow in shell and tube type of configurations. In the proposed reacting channel, the 1D channels have detailed reactions while the outer 3D flow can be reactive or nonreactive. The channels are discretized into 1D grid points and a parabolic solver is used to solve the species transport and energy equations inside the channels. Since the walls of the channels are nonpermeable, the two zones are coupled only through the heat transfer. The current approach is tested and validated for a series of problems with increasing complexities. The predictions of the channel model (CM) are compared with 3D modeling of the channels and experimental data. The CM predictions are in excellent agreement with the fully resolved (FR) model with much less computational cost. The discussed methodology is useful for applications such as fuel reformers, hydrocarbon cracking furnaces, heat exchangers, etc.

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Figures

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Fig. 1

Curved channel with variable area: (a) geometry and dimensions and (b) temperature and the velocity profiles along channel length

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Fig. 2

T-shaped configuration with (a) geometry, and profiles of bulk mean and wall temperature with two modeling approaches for (b) tube-1, (c) tube-2, and (d) tube-3

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Fig. 3

Ethane fuel cracking with the CM: (a) geometry and (b) species mole fractions at the exit

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