ANALYSIS OF THE DUAL PHASE LAG BIO-HEAT TRANSFER EQUATION WITH CONSTANT AND TIME-DEPENDENT HEAT FLUX CONDITIONS ON SKIN SURFACE

This article focuses on temperature response of skin tissue due to time-dependent surface heat fluxes. Analytical solution is constructed for dual phase lag bio-heat transfer equation with constant, periodic, and pulse train heat flux conditions on skin surface. Separation of variables and Duhamel's theorem for a skin tissue as a finite domain are employed. The transient temperature responses for constant and time-dependent boundary conditions are obtained and discussed. The results show that there is major discrepancy between the predicted temperature of parabolic (Pennes bio-heat transfer), hyperbolic (thermal wave), and dual phase lag bio-heat transfer models when high heat flux accidents on the skin surface with a short duration or propagation speed of thermal wave is finite. The results illustrate that the dual phase lag model reduces to the hyperbolic model when TT approaches zero and the classic Fourier model when both thermal relaxations approach zero. However for tau(q) = tau(T), the dual phase lag model anticipates different temperature distribution with that predicted by the Pennes model. Such discrepancy is due to the blood perfusion term in energy equation. It is in contrast to results from the literature for pure conduction material, where the dual phase lag model approaches the Fourier heat conduction model when tau(q) = tau(T). The burn injury is also investigated.