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Research Papers: Porous Media

Numerical Model of Microwave Driven Convection in Multilayer Porous Packed Bed Using a Rectangular Waveguide

[+] Author and Article Information
Waraporn Klinbun

Rattanakosin College for Sustainable Energy and Environment (RCSEE),  Rajamangala University of Technology Rattanakosin, 96 moo 3, Puthamonthon Sai 5, Salaya, Puthamonthon Nakhon Pathom 73170, Thailand

Phadungsak Rattanadecho

Research Center of Microwave Utilization in Engineering (R.C.M.E.), Department of Mechanical Engineering, Faculty of Engineering,  Thammasat University (Rangsit Campus), 99 moo 18 Klong Luang, Pathumthani 12120, Thailandratphadu@engr.tu.ac.th

J. Heat Transfer 134(4), 042605 (Feb 15, 2012) (10 pages) doi:10.1115/1.4005254 History: Received January 05, 2011; Revised September 30, 2011; Published February 15, 2012; Online February 15, 2012

The present work studies numerically the heating of multilayer porous packed bed which is subjected to the microwave radiation with a rectangular waveguide. The multilayer porous packed bed consists of the layers of fine and coarse beds. The simulations of electromagnetic field are described by solving Maxwell’s equations with the finite difference time domain (FDTD) method. The flow fields and the temperature profiles are determined by the solutions of the Brinkman–Forchheimer extended Darcy model, energy, and Maxwell’s equations. The study aims to understand of the influences of layered configuration, layered thickness, and operating frequency on the transport processes in a multilayer porous packed bed. The results show that all parameters have significant effect on the distributions of electromagnetic field inside a waveguide, temperature profiles, and velocity fields within the multilayer porous packed bed.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration model: (a) computational domain and (b) various kinds of multilayer porous packed bed (sample)

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Figure 2

Temperature distribution within single-layer porous packed bed: Comparison with experiment

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Figure 3

Distribution of electric field inside a rectangular waveguide: Effect of layered configuration (a) in case F-bed and (b) in case 2F2C-bed

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Figure 4

Comparison of electric field distribution between single and multilayer porous packed bed

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Figure 5

Temperature distribution within porous packed bed: effect of layered configuration (a) in case F-bed and (b) in case 2F2C-bed (P=500W,f=2.45GHz,andt=60s)

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Figure 6

Comparison of temperature profile between single and multilayer porous packed bed: (a) along x-axis and (b) along z-axis

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Figure 7

Velocity field within multilayer porous packed bed: effect of layered configuration (a) in case F-bed, (b) in case 2F2C-bed, and (c) in case 2C2F-bed (P=500W,f=2.45GHz,andt=60s)

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Figure 8

Comparison of electric field distribution between different layered thicknesses

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Figure 9

Comparison of temperature profile between different layered thicknesses: (a) along x-axis and (b) along z-axis

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Figure 10

Velocity field within FC-bed: Effect of layered thickness (a) in case 1F3C-bed and (b) in case 3F1C-bed (P=500W,f=2.45GHz,andt=60s)

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Figure 11

Distribution of electric field inside a rectangular waveguide: effect of operating frequency (a) in case 1.5 GHz and (b) in case 5.8 GHz

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Figure 12

Comparison of electric field distribution between different operating frequencies

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Figure 13

Temperature distribution within 2F2C-bed: Effect of operating frequency (a) in case 1.5 GHz and (b) in case 5.8 GHz (P=500Wandt=60s)

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Figure 14

Comparison of temperature profile between different operating frequencies: (a) along x-axis and (b) along z-axis

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Figure 15

Velocity field within 2F2C-bed: Effect of operating frequency (a) in case 1.5 GHz and (b) in case 5.8 GHz (P=500Wandt=60s)

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