|
Journal of Microwave Power
and Electromagnetic Energy (JMPEE) |
|
|
TITLE |
Temperature Profiles in Spheres
due to Electromagnetic Heating [PDF] |
|
AUTHORS |
H. N. Kritikos, K, R. Foster and H. P. Schwan
1981 16 3&4 327-344 |
|
YEAR |
|
|
VOLUME |
|
|
ISSUE |
|
|
PAGES |
|
|
Abstract This study predicts the steady
state temperature rise in a homogeneous tissue sphere exposed to plane wave
electromagnetic energy. The differential equation for heat transfer is solved, assuming heat transfer mechanisms of convection
(due to blood flow), conduction, and evapotranspiration
froth the surface. The tissue heating is described by the specific absorption
rate (SAR), which is a known function of the size and dielectric properties
of the sphere and the frequency of the incident electromagnetic energy. We
consider the limiting cases of irradiation at very low frequencies, very high
frequencies, and intermediate frequencies. We propose the concept of
convection length, over which distance in the SAR is effectively averaged to
produce a smoothly varying temperature increase. The results of this study
are used to predict the maximum temperature rise in the human head, produced
by an incident electromagnetic plane wave. |
|