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Research Papers: Bio-Heat and Mass Transfer

Numerical Analysis of Specific Absorption Rate and Heat Transfer in Human Head Subjected to Mobile Phone Radiation: Effects of User Age and Radiated Power

[+] Author and Article Information
Phadungsak Rattanadecho

e-mail: ratphadu@engr.tu.ac.th
Research Center of Microwave Utilization in
Engineering (RCME),
Department of Mechanical Engineering,
Faculty of Engineering,
Thammasat University, Rangsit Campus,
Pathumthani 12120, Thailand

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 11, 2011; final manuscript received April 9, 2012; published online October 5, 2012. Assoc. Editor: Darrell W. Pepper.

J. Heat Transfer 134(12), 121101 (Dec 05, 2012) (10 pages) doi:10.1115/1.4006595 History: Received April 11, 2011; Revised April 09, 2012

The human head is one of the most sensitive parts of the human entire body when exposed to electromagnetic radiation. This electromagnetic radiation interacts with the human head and may lead to detrimental effects on human health. However, the resulting thermophysiologic response of the human head is not well understood. In order to gain insight into the phenomena occurring within the human head with temperature distribution induced by electromagnetic field, a detailed knowledge of absorbed power distribution as well as temperature distribution is necessary. This study presents a numerical analysis of specific absorption rate and heat transfer in the heterogeneous human head model exposed to mobile phone radiation. In the heterogeneous human head model, the effects of user age and radiated power on distributions of specific absorption rate and temperature profile within the human head are systematically investigated. This study focuses attention on organs in the human head in order to investigate the effects of mobile phone radiation on the human head. The specific absorption rate and the temperature distribution obtained by numerical solution of electromagnetic wave propagation and unsteady bioheat transfer equation in various tissues in the human head during exposure to mobile phone radiation are presented.

Copyright © 2012 by ASME
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References

Figures

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Fig. 1

Human head exposed to mobile phone radiation

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Fig. 2

Human head model. (a) Cross section human head model with mobile phone. (b) Dimensions of human head model.

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Fig. 3

Boundary condition for analysis of electromagnetic wave propagation and heat transfer

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Fig. 4

A three-dimensional finite element mesh of human head model

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Fig. 5

Grid convergence curve of the 3D model

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Fig. 6

Geometry of the validation model obtained from the paper

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Fig. 7

Comparison of the calculated SAR distribution to the SAR distribution obtained by Nishizawa and Hashimoto [20]

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Fig. 8

Electric field distribution (V/m) in adult and child heads exposed to the radiated power of 1 W at the frequency of 900 MHz

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Fig. 9

SAR distribution (W/kg) in adult and child heads exposed to the radiated power of 1 W at the frequency of 900 MHz

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Fig. 10

The temperature distribution in adult and child heads exposed to the radiated power of 1 W at the frequency of 900 MHz: (a) 1 min, (b) 10 min, and (c) 30 min

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Fig. 11

Temperature distribution versus arc-length of child head at various times exposed to the electromagnetic frequency of 900 MHz at the radiated power of 1 W

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Fig. 12

Temperature distribution versus arc-length of adult head at various times exposed to the electromagnetic frequency of 900 MHz at the radiated power of 1 W

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Fig. 13

The slice plot and extrusion line in the human head. Slice plot of (a) SAR distribution and (b) temperature distribution. (c) The extrusion line in the human head where the SAR and temperature distributions are considered.

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Fig. 14

SAR distribution versus arc-length of adult head and child head exposed to the radiated power of 1 W

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Fig. 15

Temperature distribution versus arc-length of adult head and child head exposed to the radiated power of 1 W for 30 min

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Fig. 16

Comparison of the maximum SAR in human tissues for adult and child heads

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Fig. 17

Comparison of the temperature increases in human tissues for adult and child heads

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Fig. 18

SAR distribution versus arc-length of human head exposed to the electromagnetic frequency of 900 MHz at various radiated power

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Fig. 19

Temperature distribution versus arc-length of human head exposed to the electromagnetic frequency of 900 MHz at various radiated power, at t = 30 min

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