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Research Papers: Heat Transfer in Manufacturing

Interactions Between Electromagnetic and Thermal Fields in Microwave Heating of Hardened Type I-Cement Paste Using a Rectangular Waveguide (Influence of Frequency and Sample Size)

[+] Author and Article Information
P. Rattanadecho1

Research Center of Microwave Utilization in Engineering (RCME), Faculty of Engineering, Thammasat University, Pathumthani 10120, Thailandratphadu@engr.tu.ac.th

N. Suwannapum, W. Cha-um

Research Center of Microwave Utilization in Engineering (RCME), Faculty of Engineering, Thammasat University, Pathumthani 10120, Thailand

1

Corresponding author.

J. Heat Transfer 131(8), 082101 (Jun 01, 2009) (12 pages) doi:10.1115/1.2993134 History: Received May 16, 2007; Revised June 27, 2008; Published June 01, 2009

Microwave heating-drying of hardened Type I-cement paste using a rectangular waveguide is a relatively new area of cement-based materials research. In order to gain insight into the phenomena that occur within the waveguide together with the temperature distribution in the heated cement paste samples, a detailed knowledge of absorbed power distribution is necessary. In the present paper, a three-dimensional finite difference time domain scheme is used to determine electromagnetic fields (TE10-mode) and microwave power absorbed by solving transient Maxwell’s equations. Two-dimensional heat transport within the cement paste located in rectangular waveguide is used to evaluate the variations of temperature with heating time at different frequencies and sample sizes. A two-dimensional heating model is then validated against experimental results and subsequently used as a tool for efficient computational prototyping.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of experimental facility: (a) equipment setup; (b) microwave measuring system

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Figure 2

Distribution of the electric field for TE10 mode in a waveguide of dimensions a and b

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Figure 4

Grid system configuration

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Figure 5

Computational schemes

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Figure 6

The electric field distribution (Case 1)

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Figure 7

The electric field distribution (Case 2)

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Figure 8

The electric field distribution (Case 3)

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Figure 9

The electric field distribution (Case 4)

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Figure 10

The electric field distribution (Case 5)

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Figure 11

Temperature distribution (°C) at various heating times (Case 2): (a) 20s; (b) 40s; (c) 60s

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Figure 12

Microwave power absorbed (MW∕m3) at various heating times (Case 2): (a) 20s; (b) 40s; (c) 60s

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Figure 13

Temperature distribution (°C) at various heating times (Case 3): (a) 20s; (b) 40s, (c) 60s

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Figure 14

Microwave power absorbed (MW∕m3) at various heating times (Case 3): (a) 20s; (b) 40s; (c) 60s

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Figure 15

Temperature distribution (°C) at various heating times (Case 4): (a) 20s; (b) 40s; (c) 60s

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Figure 16

Microwave power absorbed (MW∕m3) at various heating times (Case 4): (a) 20s; (b) 40s; (c) 60s

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Figure 17

Temperature distribution (°C) at various heating times (Case 5): (a) 20s; (b) 40s; (c) 60s

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Figure 18

Microwave power absorbed (MW∕m3) at various heating times (Case 5): (a) 20s; (b) 40s; (c) 60s

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Figure 19

Temperature distribution in cement paste along horizontal axis (z=50mm) (P=1000W, f=2.45GHz, size=110mm(x)×50mm(z))

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Figure 20

Temperature distribution in cement paste along horizontal axis (z=50mm) (P=1000W, f=2.45GHz, size=110mm(x)×80mm(z))

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Figure 21

The comparison of temperature distribution (°C) in wood sample: (a) simulated result and (b) experimental result

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Figure 22

The heating characteristics for various heating conditions due to microwave energy for (a) case 2, (b) case 3, (c) case 4, (d) case 5. The darker shaded region represents the hot spot.

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