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TECHNICAL PAPERS: Porous Media

Influence of Irradiation Time, Particle Sizes, and Initial Moisture Content During Microwave Drying of Multi-Layered Capillary Porous Materials

[+] Author and Article Information
P. Ratanadecho, K. Aoki, M. Akahori

Department of Mechanical Engineering, Nagaoka University of Technology, 1603-1, Kamitomioka, Nagaoka, Niigata, 940-2188, Japan

J. Heat Transfer 124(1), 151-161 (Sep 10, 2001) (11 pages) doi:10.1115/1.1423951 History: Received April 10, 2001; Revised September 10, 2001
Copyright © 2002 by ASME
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References

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Aoki, K., Ratanadecho, P., and Akahori, M., 2000, “Characteristics of Microwave Heating for Multi-layered Materials Using a Rectangular Wave Guide,” Proceeding of the 4 th JSME-KSME Thermal Engineering Conference, October 1–6, Kobe, Japan, Vol. 2, pp. 191–196.
Ratanadecho,  P., Aoki,  K., and Akahori,  M., 2002, “A Numerical and Experimental Study of Microwave Melting of Frozen Packed Bed Using a Rectangular Wave Guide,” IEEE Trans. Microwave Theory Tech., accepted for publication.
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Figures

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Distribution of electric field for case of a rectangular waveguide is empty (x=54.61 mm)
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Distribution of electric field for the sample inserted in the rectangular waveguide (t=15 min,x=54.61 mm)
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Distribution of electric field for the sample inserted in the rectangular waveguide (t=540 min,x=54.61 mm)
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Temperature profile in times at various depths (P=50 W,d=0.15 mm,s0=1.0): (a) experiment; and (b) simulation
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Temperature profile in times at various depths (P=50 W,d=0.15 mm,s0=0.6): (a) experiment; and (b) simulation
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Temperature profile in times at various depths (Experiment: P=50 W,d=1.0 mm,s0=1.0)
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Microwave power absorbed profile in times: (Simulation P=50 W,d=0.15 mm)
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Schematic of experimental facility: (a) equipment setup; and (b) multi-layered porous packed bed (Sample)
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Typical relationship between, pc and se
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water saturation as a function of depth for C-F Bed (Experiment: P=50 W,t=360 min))
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Temperature as a function of depth at various times for C-F Bed (Experiment: P=50 W,t=360 min))
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Comparison between simulated results (a) and experimental results (b) of temperature distribution (°C) within the sample (s0=1.0,t=120 min,d=0.15 mm, dimensions: 110 mm (x) ×50 mm (z))
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Comparison between simulated results (a) and experimental results (b) of temperature distribution (°C) within the sample (s0=0.6,t=120 min,d=0.15 mm, dimensions: 110 mm (x) ×50 mm (z))
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Water saturation as a function of depth at various times (P=50 W,d=0.15 mm,s0=1.0)
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Water saturation as a function of depth at various times (P=50 W,d=0.15 mm,s0=0.6)
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The simulated water saturation distributions (dimensionless) within the sample (s0=1.0, time=120 min, d=0.15 mm, Dimensions: 110 mm (x) ×50 mm (z))
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The simulated water saturation distributions (dimensionless) within the sample, (s0=0.6, time=120 min, d=0.15 mm, Dimensions: 110 mm (x) ×50 mm (z))
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The variation of drying rate with respect to time
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water saturation as a function of depth for F-C Bed (Experiment: P=50 W,t=360 min))
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Temperature as a function of depth at various times for F-C Bed (Experiment: P=50 W,t=360 min))

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