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Research Papers: Heat and Mass Transfer

A Synergistic Combination of Thermal Models for Optimal Temperature Distribution of Discrete Sources Through Metal Foams in a Vertical Channel

[+] Author and Article Information
Banjara Kotresha

Department of Mechanical Engineering,
National Institute of Technology Karnataka,
Surathkal 575025, India
e-mail: bkotresha@gmail.com

N. Gnanasekaran

Department of Mechanical Engineering,
National Institute of Technology Karnataka,
Surathkal 575025, India
e-mail: gnanasekaran@nitk.edu.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 15, 2018; final manuscript received November 2, 2018; published online December 13, 2018. Assoc. Editor: Yuwen Zhang.

J. Heat Transfer 141(2), 022004 (Dec 13, 2018) (8 pages) Paper No: HT-18-1150; doi: 10.1115/1.4041955 History: Received March 15, 2018; Revised November 02, 2018

This paper discusses about the numerical prediction of forced convection heat transfer through high-porosity metal foams with discrete heat sources in a vertical channel. The physical geometry consists of a discrete heat source assembly placed at the center of the channel along with high thermal conductivity porous metal foams in order to enhance the heat transfer. The novelty of the present work is the use of combination of local thermal equilibrium (LTE) model and local thermal nonequilibrium (LTNE) model for the metal foam region to investigate the temperature distribution of the heat sources and to obtain an optimal heat distribution so as to achieve isothermal condition. Aluminum and copper metal foams of 10 PPI having a thickness of 20 mm are considered for the numerical simulations. The metal foam region is considered as homogeneous porous media and numerically modeled using Darcy Extended Forchheimer model. The proposed methodology is validated using the experimental results available in literature. The results of the present numerical solution indicate that the excess temperature of the bottom heat source reduces by 100 °C with the use of aluminum metal foam. The overall temperature of the vertical channel reduces based on the combination of LTE and LTNE models compared to only LTNE model. The results of excess temperature for both the empty and the metal foam filled vertical channels are presented in this work.

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Figures

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Fig. 1

Schematic of physical geometry along with computational domain and boundary conditions

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Fig. 2

Combination of LTE and LTNE thermal model

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Fig. 3

Pressure drop comparison with experimental benchmarks for aluminum metal foam

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Fig. 4

Comparison of temperature difference with experimental result benchmarks

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Fig. 5

Temperature contours for LTNE and combination of LTE -LTNE

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Fig. 6

Comparison of excess temperature for bottom heater

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Fig. 7

Variation of excess temperature on heater surfaces for equal heat input of 9.2 W

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Fig. 8

Variation of excess temperature on heater surfaces for different heat input

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Fig. 9

Variation of excess temperature on heater surfaces for aluminum and copper metal foams

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Fig. 10

Isothermal condition on all heaters for aluminum metal foam

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Fig. 11

Isothermal condition on all heaters for copper metal foam

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