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Research Papers: Bio-Heat and Mass Transfer

Numerical Analysis of Specific Absorption Rate and Heat Transfer in the Human Body Exposed to Leakage Electromagnetic Field at 915 MHz and 2450 MHz

[+] Author and Article Information
Teerapot Wessapan, Siramate Srisawatdhisukul

Department of Mechanical Engineering, Research Center of Microwave Utilization in Engineering (RCME), Faculty of Engineering, Thammasat University (Rangsit Campus), Pathumthani 12120, Thailand

Phadungsak Rattanadecho

Department of Mechanical Engineering, Research Center of Microwave Utilization in Engineering (RCME), Faculty of Engineering, Thammasat University (Rangsit Campus), Pathumthani 12120, Thailandratphadu@engr.tu.ac.th

J. Heat Transfer 133(5), 051101 (Jan 31, 2011) (13 pages) doi:10.1115/1.4003115 History: Received January 06, 2010; Revised November 17, 2010; Published January 31, 2011; Online January 31, 2011

In recent years, society has increased utilization of electromagnetic radiation in various applications. This radiation interacts with the human body and may lead to detrimental effects on human health. However, the resulting thermophysiologic response of the human body is not well understood. In order to gain insight into the phenomena occurring within the human body with temperature distribution induced by electromagnetic field, a detailed knowledge of absorbed power distribution is necessary. In this study, the effects of operating frequency and leakage power density on distributions of specific absorption rate and temperature profile within the human body are systematically investigated. This study focuses attention on organs in the human trunk. The specific absorption rate and the temperature distribution in various tissues, obtained by numerical solution of electromagnetic wave propagation coupled with unsteady bioheat transfer problem, are presented.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Wave leakage from an electromagnetic radiation device

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Figure 2

Human body vertical cross section (16)

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Figure 3

Boundary condition for analysis

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Figure 4

An initial two-dimensional finite element mesh of human cross section model

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Figure 5

Grid convergence curve of the 2D model

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Figure 6

Geometry of the validation model obtained from the paper (3)

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Figure 7

Comparison of the calculated SAR distribution to the SAR distribution obtained by Nishizawa and Hashimoto (5)

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Figure 8

Electric field distribution in human body (V/m) exposed to the leakage power density of 5 mW/cm2 at the frequencies of (a) 915 MHz and (b) 2450 MHz

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Figure 9

SAR distribution in human body (W/kg) exposed to the leakage power density of 5 mW/cm2 at the frequencies of (a) 915 MHz and (b) 2450 MHz

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Figure 10

The temperature distribution of human body exposed to electromagnetic wave at the frequencies of 915 MHz and 2450 MHz: (a) 1 min, (b) 10 min, and (c) steady state

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Figure 11

Temperature distribution versus arc length of human body at various times exposed to the electromagnetic frequency of 915 MHz at the leakage power density of 5 mW/cm2

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Figure 12

Temperature distribution versus arc length of human body at various times exposed to the electromagnetic frequency of 2450 MHz at the leakage power density of 5 mW/cm2

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Figure 13

The extrusion line in the human body where the SAR and temperature distribution are considered

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Figure 14

SAR distribution versus arc length of human body exposed to the leakage power density of electromagnetic field at the 5 mW/cm2

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Figure 15

Temperature distribution versus arc length of the human body exposed to the leakage power density of electromagnetic field at 5 mW/cm2

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Figure 16

Comparison of the maximum SAR in human tissues at the frequencies of 915 MHz and 2450 MHz

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Figure 17

Comparison of the temperature increases in human tissues at the frequencies of 915 MHz and 2450 MHz

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Figure 18

Temperature increase versus arc length of human body exposed to the electromagnetic frequency of 915 MHz at various leakage power densities, at t=1 min

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Figure 19

Temperature distribution of human body exposed to the electromagnetic frequency of 915 MHz at t=1 min at various leakage power densities: (a) 5 mW/cm2, (b) 10 mW/cm2, (c) 50 mW/cm2, and (d) 100 mW/cm2

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