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1 Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

1 2006

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Analysis of thermal processes proceeding in the skin tissue subjected to freezing

Majchrzak E., Kałuża G.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2006

z. 26

225-230

The freezing process of skin tissue is described by the strongly non-linear bioheat transfer equation in which the additional term controlling the evolution of latent heat appears. Using the approach called 'the one domain method' finally one obtains the partial differential equation containing the substitute thermal capacity of tissue. The boundary and initial conditions determine the thermal interaction between the tissue and cryoprobe tip. In the paper we consider the external cylindrical cryoprobe. In order to estimate the influence of cryoprobe geometry on the course of the process the shape sensitivity analysis has been applied. In particular the direct approach is used (explicit differentiation method). The results of numerical modelling (the boundary element method is applied) allow to formulate the essential practical conclusions concerning the course of cryosurgery treatments.